180 PEOC. ENT. SOC. WASH., VOL. 20, NO. 8, NOV. 1918 



little shining area posteriorly; scutellum polished, punctured round the 

 sides, but scarcely at all along the middle ; area of metathorax shining, with 

 irregular coarse branching rugae; sides of metathorax coarsely cancellate; 

 tegulae piceous, not punctured; wings dusky; stigma and nervures dark 

 brown; second submarginal cell marrow, third long, its outer nervure 

 (which is strong) with a double curve; legs very dark brown; abdomen 

 without hair-bands or patches, the depressed hind margins of segments with 

 scanty pale hair; apical plate very broadly rounded, with pallid margin; 

 venter ferruginous, with a dusky cloud about the middle. The joints of 

 the flagellum are hardly at all gibbous, and have a feebly sculptured sur- 

 face, without any sharply pitted or honey-comb-like structure. 



Cordova, Mexico, October (L. 0. Howard} U. S. Nat. Museum. 

 Nearest to H. pectoralis Smith, to the vicinity of which it runs in 

 Crawford's (1907) table. It is larger, and has the mesothorax 

 more coarsely and densely punctured. It also differs conspicu- 

 ously by the long third submarginal cell. It has rather the 

 aspect of a Sphecodes, owing to the coarse sculpture and shape of 

 the head; but the antennae are those of Halictus, and the face is 

 not densely covered with white hair. 



Halictus deceptor Ellis. 



Cacao, Trece Aguas, Alta Vera Paz, Guatemala, June 1907 (G. 

 P. Goll). 



Rhopalictus patagonicus sp.n. 



Female. Length nearly 7 mm., anterior wing 5.7 mm.; head, thorax, 

 legs and antennae black, the flagellum very obscurely brownish beneath, 

 the small joints of tarsi reddish; abdomen shining ferruginous, impunctate 

 and without hair-bands, first segment marked with black on each side 

 toward base, venter mainly black, with base and apex broadly red; pubes- 

 cence very scanty, pale fuscous on outer side of hind tibiae; face broad, 

 the eyes strongly emarginate, clypeus and supraclypeal area distinctly 

 greenish, clypeus high, microscopically tesselated, very sparsely punc- 

 tured; front minutely rugulose; mesothorax shining, without distinct punc- 

 tures, the surface microscopically tesselated; area of metathorax long, 

 shining, without plicae; posterior truncation shining, not sharply bounded; 

 tegulae piceous; wings faintly dusky, stigma and nervures dark brown; 

 second submarginal cell rather broad, receiving first recurrent nervure 

 very near its end; third submarginal cell broad, broader on marginal than 

 second; hind spur with numerous short, slender spines; ventral abdominal 

 segments fringed with long erect hair. 



Chubut, Patagonia, from W. F. H. Rosenberg; U. S. Nat. 

 Museum. I had at first placed this as an aberrant Halidus, but 

 it is clearly congeneric with Rhopalictus corinogaster (Spinola) 



