wheeler: ants of the genus opisthopsis. 353 



on the base of the second segment are orange-yellow, just perceptibly 

 paler than the pronotum. The femora are black, with only their 

 tips reddish, the tibiae reddish brown. Mandibles and anterior 

 corners of cheeks red. Eyes pearl-gray. 



Described from a single specimen found running on one of the white- 

 trunked Eucalyptus trees on the mountain west of Townsville, 

 Queensland. 



8. Opisthopsis rufithorax Emery. 



Plate 1, fig. 5, 6. 



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

 fig. 3A.; Emery, Mem. R. accad. sci. ist. Bologna, 1896, ser. 5, 

 5, p. 776; Froggatt, Agrie. gaz. N. S. W., 1905, p. 28, S ; Forel, 

 Ark. f. zool., 1915, 9, p. 95, S 9 . 



Worker. Length 4-5 mm. 



Very similar to pictus in structure, but with the dorsal outline of 

 the thorax in profile a little more rounded and the epinotum slightly 

 lower and with a somewhat more rounded angle. 



Sculpture and pilosity as in pictus. 



Color of head and antennae as in pictus; thorax, legs, and petiole 

 orange-yellow throughout, last tarsal joint blackish or dark brown. 

 Gaster black, with the first two segments either entirely orange- 

 yellow, of a slightly paler tint than the thorax, or with the sides of 

 these segments and the posterior portion of the second blackish. 



Female. Length 7-10 mm. 



"Head behind broader than in the worker, cheeks not convex. 

 Thorax as broad as the head. Occiput, vertex and funiculus brown. 

 Scutellum and a narrow but clearly defined transverse band on each 

 gastric segment black. All the remainder of the body yellowish red, 

 only the middle of the pronotum infuscated. Wings lacking. In all 

 other respects like the worker." (Forel). 



Queensland: Peak Downs, type-locality (Museum Godeffroy); 

 Atherton and Cedar Creek (E. Mjoberg) ; Enoggera and Sunnybank, 

 near Brisbane (Wheeler) ; Gayndah, Bundaberg, and Mungar Junction 

 (A. M. Lea); Cairns (F. P. Dodd). New South Wales: Manilla 

 (W. W. Froggatt). South Australia: Moorooloo, Flinders Range 

 (S. A. White). West Australia: Mullewa (Miss F. May); Clarence 

 River (A. and F. Zietz). 



