wheeler: ants of the genus opisthopsis. 351 



large, prominent eyes and feebly concave posterior border, its sides 

 feebly convex in large workers, straight in small individuals. Man- 

 dibles 5-toothed, with rather straight external borders. Clypeus 

 distinctly carinate behind. Thorax evenly compressed laterally in 

 the epinotal region, base of the latter in profile straight and hori- 

 zontal, scarcely impressed at the mesoepinotal suture; base and 

 declivity meeting at a sharp obtuse angle, the declivity abruptly 

 sloping and concave. Petiolar scale slightly thinner and lower than 

 in respiciens, its anterior and posterior surfaces flat, the former convex 

 above where it meets the rounded, entire and rather sharp superior 

 border. Gaster elongate elliptical, of the usual shape, with the ante- 

 rior surface of the first segment truncated. 



Rather shining; head more opaque and more sharply shagreened; 

 gaster very finely and transversely striolate, with silky luster; mandi- 

 bles coarsely punctate and somewhat striate near their apical borders. 



Hairs sparse, whitish, erect, blunt, most numerous on the head and 

 gaster; thorax and petiole without hairs, except a few on the dorsal 

 surface of the pronotum. 



Head black, with the mandibles and anterior border of the cheeks 

 and clypeus lemon-yellow. Antennal scapes orange-yellow; funiculi 

 black, in some specimens with the first joint brown or yellowish. 

 Palpi black. Pronotum and dorsal portions of mesonotum and 

 epinotum above an oblique line on each side running from the inferior 

 border of the pronotum to the epinotal angle, orange-yellow; below 

 this line and including the prosternum, black. Scale of petiole brown 

 or blackish, its basal portion yellow. Gaster black, first and second 

 segments orange-yellow, with the sides more or less infuscated or 

 black. Coxae, trochanters, and basal f of femora black, remainder 

 of femora and tibiae orange-yellow; tarsi more brownish. The 

 yellow of the legs and gaster is distinctly paler than that of the thorax. 

 Eyes black in some specimens, in others pearl-gray. 



Queensland: Kamerunga, type-locality (Podenzana); Towns- 

 ville (F. P. Dodd); Nelson (A. A. Gifault). 



I have redescribed this form from four workers taken by F. P. 

 Dodd and belonging to the Museum of South Australia. With the 

 exception of a single worker taken by Girault at Nelson, all the other 

 specimens of the species in my collection belong to the three following 

 undescribed varieties. 



