THE CANADIAN ENTOMOLOGIST 139 



femora), the hind tibiae also dark on basal half externally, and the 

 hind tarsi black; mandibles red subapically; antennae black; 

 teguke clear ferruginous; wings rather strongly infuscated, espe- 

 cially apically; hair of eyes rather short (80 microns long); face 

 densely covered with white hair; posterior orbits, especially be- 

 low, with a fringe of short, white hair; mesothorax and scutellum 

 densely, rugosely punctured, but the posterior disc of mesothorax 

 and a small area in middle of scutellum, smooth and shining; 

 mesothorax very thinly hairy, but anteriorly with two o\aI, 

 oblique, bright, fulvous hair-patches; scutellum with a small 

 median tubercle, directed upward; axillar spines slender, curved 

 inward; mesopleura thinly hairy; stigma ferruginous; nervures 

 fuscous; anterior coxae spined; spurs ferruginous; abdomen dorsally 

 shining, with large, scattered punctures; hind margins of segments 

 fringed with white hair, weak on first, and interrupted on second; 

 venter with broad, apical margin of first segment and base of 

 second red; no ventral keel; fourth ventral segment produced and 

 truncate in middle of margin; fifth with an apical pit; apical teeth 

 of abdomen six, not counting very small ones or penultimate. 

 segment; lateral teeth long and slender; lower apical longer than 

 upper; no median denticle. 



Carcarana, Argentina (Briiner, 65), U. S. National Museum. 

 Very near to C. jujiiyensis Holmbg. (9), but apparently not its 

 male, on account of the rugose scutellum. Also close to C. cordil- 

 lerana Holmbg., but that has the male abdomen 7-dentate. Also 

 allied to C. bruchi Schrott., but quite distinct. The apical seg- 

 ment of abdomen is much less produced than in C. nifihasis Ckll.. 

 which closely resembles it in superficial appearance, though not in 

 structure. 



Pseudagapostemon pampeanus (Holmberg) . 

 A male and female from Carcarana (Bruner, 77, 19) are pro- 

 visionally referred here, but may represent a distinct species, and 

 it is not certain that the sexes are correctly associated. The 

 female is very close to P. joergenseni (Friese), but much broader. 

 The genus contains a number of closely related forms, the re- 

 lationships of which are not clearly understood. 



Halictus (Chloralictus) bruneriellus, sp. n. 



? .—Length about 6.5 mm., anterior wing 5 mm.; head and 



