350 bulletin: museum of comparative zoology. 



3. Opisthopsis maurus, sp. nov. 

 Plate 3, fig. 18, 19. 



Worker. Length 6 mm. 



Body long and slender; head j longer than broad, flattened dorsally 

 and ventrally, wdth long, straight, anteriorly converging sides and 

 distinctly concave posterior border. Eyes large and prominent. 

 Mandibles 5-toothed, their external borders rather straight. CI;yT)eus 

 distinctly carinate. Antennal scapes extending only a short distance 

 beyond the posterior orbits. Thorax slender and low, its dorsal 

 outline in profile straight and horizontal, very feebly interrupted at 

 the promesonotal and mesoepinotal sutures. Epinotum ^\ith dis- 

 tinct but rounded obtuse angle between the subequal base and de- 

 clivity. Petiole with semicircular, entire superior border, compressed 

 anteroposteriorly, feebly convex in front, flat behind. Gaster long 

 and narrow, with pointed tip and the anterior surface of the basal 

 segment scarcely truncated. 



Subopaque; densely and sharply shagreened; head and gaster 

 with small, scattered, piligerous punctures; mandibles more densely 

 and more coarsely punctate; surface of clypeus uneven. 



Hairs pale grayish, sparse, present only on the head and gaster and 

 on the tips of the femora and antennal scapes. 



Black; knees, tips of tibiae, bases of mandibles, and eyes dark brown. 



Described from a single specimen taken at Koah, Queensland, in a 

 nest of 0. haddoni occupying the basal galleries of a conical termi- 

 tarium. The specimen is so different in shape, sculpture, and color 

 from the workers of haddoni and from all of the other members of the 

 genus that I believe it must represent a distinct species. It had 

 probably been reared from a larva or pupa kidnapped and brought 

 into the nest by the haddoni workers. 



4. Opisthopsis pictus Emery. 



Plate 3, fig. 27. 



Opisthopsis pictus Emery, Ann. Soc. ent. Belg., 1895, 39, p. 354, 

 y fig. 3B.; Emery, Mem. R. accad. sci. ist. Bologna, 1896, 

 ser. 5, 5, p. 776; Froggatt, Agric. gaz. N. S. W., 1905, p. 28. 



Worker. Length 4-5 mm. 



Head rather flat dorsally and ventrally, twice as long as high, ^vith 



