XXI.—A new Camponotus from Madagascar and a Small Collection of Ants from Mauritius. Author Horace Donisthorpe, F.Z.S., F.R.E.S., etc. XXI.—A new Camponotus from Madagascar and a Small Collection of Ants from Mauritius. Horace Donisthorpe, F.Z.S., F.R.E.S., etc. This paper deals with a small collection of ants sent to mo by M. Raymond Mamet of Mauritius. There are three new species which I have described ; one of these is a second species of the interesting genus Dodous Donisthorpe. Two of the new species are from Mauritius. I have arranged the list in the order of M. Mamet's numbers and not under that of subfamilies, etc., as in my paper on the Ants of Mauritius [Ann. Mag. Nat. Hist. (11) xiii 25-35 (1946)]. No. 123. Camponotus (Tanaemyrmex) gerberti, sp. n. Soldier. Very pale dirty yellow, head reddish yellow, mandibles dark, red, teeth, scapes, anterior border of clypeus, and extreme anterior angles of cheeks black, clothed with very sparse outstanding longer and shorter yellow hairs and some fine very short decumbent yellow hairs. Sculpture consisting of very fine reticulations, a little stronger on head. Head large, triangular, considerably broader behind than in front, broadest a little before posterior angles, which are rounded and prominent, posterior border excised, slightly sinuate on each side; mandibles massive, strongly punctured and with transverse ridges, masticatory border armed with six large strong teeth, the apical one being the longest, curved and sharp, the next two longer and sharper than the last three ; clypeus large, somewhat flat, carinate and slightly convex on disc, anterior border considerably produced in middle where it is somewhat crenulate, and five large punctures are present along the edge, and smaller punctures, rather wide apart, are scattered over the rest of the surface, posterior border excised in middle ; frontal area very faintly defined ; frontal carinse rather long, raised, with sharp edges, the rims or edges enclosing the antenna! sockets are considerably raised and prominent; a very fine narrow longitudinal ridge takes the place of the frontal furrow and extends between the frontal carinae as far back as their extreme edges ; eyes large, broad oval, rather flat, are situated rather high up before the middle of the sides of the head; antenna; 12-jointed, scape long, thickened at apex, extending beyond the posterior border of head funiculus with all the joints elongate, first slightly shorter than the others, last joint long and pointed. Thorax longer than broad, broadest behind centre of sides of pronotum, somewhat slender behind ; pronotum ample. convex, with a short neck, sides margined, considerably widened afterneck, posterior border semicircular ; sutures between pro- and mesonotum, and meso- and epinoturn fine but distinct; mesonotum longer than broad, shorter than pronotum, somewhat flat on disc, sides rather straight, epinotum longer than mesonotum, sides rather straight, angle between dorsal surface and declivity not marked, dorsal surface longer than declivity. Scale of petiole rather thick at base, anterior surface slightly convex, posterior surface slightly concave, upper surface narrow and forming a rather sharp ,ridge ; gaster oval, not very voluminous, pointed at apex. Legs fairly long; tibise prismatic. Long. 18 mm. Workers Of the same pale colour as the soldiers. but only the extreme anterior angle of clypens and cheeks blackish; the mandibles are pale yellow with the teeth red. The sculpture and hairs are similar. Head long, narrow, broader in front than behind, broadest a little in front of sides of head, narrowed, rather sharply behind eyes to base ; teeth to mandibles somewhat more slender and sharper, carinse on clypeus a little more pronounced ; eyes more prominent. Thorax narrow and slender; pronotum more narrowed to apex. Scale of petiole of similar shape, but a little narrower ; gaster and-legs of similar shape. Long. 10-12 mm. Described from eight soldiers and seven workers. These ants were found by M. Mamet in an old collection of insects at the College of Agriculture, Mauritius. They were collected by S. Geberti in 1917, on Sainte Marie Island, which is situated on the East Coast of Madagascar. No. 124. Dodous bispinosus, sp. n. Very like trispinosus but without the two shorter spines "on the mesonotum. The sculpture is different, and the species is also a little darker in colour. ?. Head: the sculpture is quite different; the disc is smooth and shining, from the outer part of the smooth surface at sides semicircular carinse run on each side along the cheeks, and from the posterior part a few weaker carinse extend towards base of head, the space between these and the posterior border of head being smooth and shining. Thorax: the ridges on the pronotum are considerably less marked ; the mesonotum is smooth and shining and there are no spines present. The ridges on the sides of the thorax are less marked; the dorsal surface and the declivity of the epinotum are smooth and shining. The spines on the pronotum are slightly longer and stronger, and those of the epinotum, being of a different shape, being slightly shorter, and projecting outwards then inwards in an even curve. Long. 5 mm. Described from two specimens collected on Le Pouce Mt. November 2nd, 1948. Coll. Ray. Mamet. I erected the genus Dodous for the receipt of a number of workers and two males taken by M. Raymond Mamet on Colcotte Mt., Mauritius, in 1941. [Proc. R. Ent. Soc. Lond. (B) xv. pts. 11 and 12 (Dec. 1946), pp. 145-46. The description of the genus requires a slight modification as there are no spines on the mesonotum in this species. No. 125. Solenopsis mameti Donisthorpe, Ann. Mag. Nat. Hist. (11) xii. 777 (1945) 1946. 35 ?? Le Pouce Mt., Mauritius. " Nesting in decaying wood." November 2nd, 1948 (Mamet). No. 126. Technomyrmex primroseae, sp. n. ?. Black, rather shining, mandibles, antennae and legs dirty pale yellow, the petiole brighter yellow. Sculpture : head and gaster finely reticulate, thorax more distinctly so, clothed with fine golden pubescence, which is more pronounced on gaster and a few short outstanding hairs, more being present on gaster. Head oval, somewhat narrower in front than behind, broadest a little behind eyes, posterior angles rounded, .posterior border excised in middle ; mandibles moderately long; triangular apical tooth sharp and curved, masticatory border aimed with a number of small sharp teeth, the second and fourth being longer than the third ; clypeus fairly large, anterior border excised in middle, posterior border extending in a point between the frontal carinao ; frontal area small but distinct ; frantal carinne short, low, fairly wide apart, parallel; eyes large, round, rather prominent, situated in front of sides of head ; antennm 12-jointed, scape long, extending beyond posterior border of head, funiculus with first joint longer than third, second joint the shortest, rest of joints gradually increasing in length and breadth, last joint as long as the two preceding taken together. Thorax with a neck, longer than broad, constricted in middle, broadest at humeral angles; pronotum large, transverse, convex, anterior border margined, posterior border semicircular encircling mesonotum ; mesonotum shorter and narrower than pro-notum, a little longer than broad, slightly convex; sutures between pro- and mesonotum and meso- and epinotum well marked, especially the latter; epinotum with angle between dorsal surface and declivity well marked, declivity abrupt, somewhat flat, considerably longer than dorsal surface. Petiole narrow, flat, slightly longer than broad, scale entirety rudimentary ; gaster oval, overhanging the petiole, pointed at apex, fifth segment extending a little beyond the fourth, cloacial opening terminal. Long. 2-5 mm. Described in honour of my cousin Primrose Griffiths (ne'e Donisthorpe), who has always taken an interest in my work, from sixteen workers. Mauritius on Le Pouce Mt., November 2nd, 1948, nesting in a dead tree stump (R. Mamet). No. 127, Strumigenys (Cephaloxys) raymondi Donisthorpe, Ann. Mag. Nat. Hist. (11) xii. p. 779 (1945), 1946. ?? " In decaying wood." Le Pouce Mt., Mauritius, -November 2nd, 1948 (Mamet). No. 128. Brachymyrmex cordemoyi Forel, Ann. Soc. Ent. Belg. xxix. p. 49 (1895). 21 workers, 3 winged queens. " Nesting in dead tree stump." Le Pouce Mt., Mauritius (Mamet), November 2nd, 1948, No 129. Camponotus (Myrmosericus) aurosus Roger, Berlin Ent. Zeitschr. vii. p. 134 (1863). 1 soldier, 1 worker. Le Pouce Mt., Mauritius (Mamet), November 2nd, 1948. No. 130. Pheidole (Pheidole) megacephala F., Ent. Syst. ii. p. 361 1793). 1 worker. Le Pouce Mt., Mauritius, November 2nd, 1948 (Mamet).