152 Zoologica: N. Y. Zoological Society [HI; 4 



tion and with specimens taken elsewhere in British Guiana by 

 F. A. Lutz, F. M. Gaige and myself. 



The female closely resembles that of the var. palans, but the 

 head is longer, fully as long as broad and more narrowed ante- 

 riorly; the epinotal spines are shorter and stouter, not longer 

 than broad at their bases, the posterior angles of the petiole are 

 less acute, the mandibles are darker, the legs paler and more 

 uniformly brownish yellow, the hairs on the body are whitish. 



12. — Crematog aster ( Orthocrema) limata F. Smith subsp. 

 parabiotica Forel. 



This subspecies was not found nesting in the petioles but 

 attending Membracids on the shoots of young Tachigalias. As 

 I have shown in another paper (l521) it commonly lives in 

 parabiosis with Camponotiis femoratns {vide infra p. 167) in 

 the peculiar "ant-gardens" attached to the trunks and branches 

 of trees in the moist jungle. Both species of ants forage together 

 and when found on Tachigalia the workers intermingle on the 

 shoots and are very friendly to one another and to the Membracids 

 but very pugnacious when interfered with. 



13. — Crematogaster (Orthocrema) delitescens sp. nov. 



Worker. Length 2-2.1 mm. 



Head nearly circular, convex and rounded above, without 

 distinct posterior corners ; eyes moderately convex, situated just 

 behind the middle of the sides, distant nearly twice their length 

 from the anterior border of the head. Mandibles narrow, convex, 

 their short apical borders with four small teeth. Clypeus convex 

 in the middle, its anterior border slightly reflected, broadly and 

 evenly rounded. Frontal carinas short, subparallel. Antennas 

 slender ; scapes extending a little beyond the posterior border of 

 the head ; funicular joints 2-8 as long as broad, ninth joint longer 

 than broad ; club slender, decidedly shorter than the remainder 

 of the funiculus, its basal about two-thirds as long as its terminal 

 joint. Thorax short ; pro- and mesonotum together subtriangulai 

 from above, as broad as long ; the pronotum flattened, marginate 

 on the sides, the mesonotum very short and narrow, declivous. 



