234 THE CAJ^ADIAJ^ ENTOMOLOGIST. 



NEW AND LITTLE-KNOWN BEES. 



BY T. D. A. COCKERELL, BOULDER, COLORADO. 



Tetralo7iia fulvitarsis, Cresson. — At Boulder, Colorado, May 21, 



1907, Mrs. C. Bennett took two females and a male of Tetraloiiia at 



flowers of vetch. The male is T. fulvitarsis, \\\\]\q the females are T. 



/rater aragal/i, Ckll. This suggests that aragalli is the female of 



fulvitarsis, and although I cannot prove it, I believe this to be the case. 



Aiidrena ziziceform is, s,\). noy. — ?. Length about 7 mm.; black; 

 head transversely oval, broader than long ; clypeus shining, with sparse 

 strong punctures ; process of labrum broadly truncate ; cheeks rounded, 

 not large ; front striatulate, with a prominent longitudinal keel ; flagellum, 

 except basally, clear ferruginous beneath ; third antennal joint nearly as 

 long as the following three together, these being very short ; pubescence 

 dull white, caudal fimbria pale golden ; teguUe testaceous ; stigma and 

 nervures clear ferruginous ; legs dark brown, small joints of tarsi ferrugi- 

 nous. Exceedingly like A. zizice (specimen collected at Milwaukee by Dr. 

 Gr^enicher compared), but differing as follows : Clypeus shining ; 

 flagellum much more slender basally; face broader; frontal keel longer 

 and more prominent ; facial fovese grayish-white (not yellowish), very 

 inconspicuous v/hen seen from in front ; thorax narrower, mesothorax wiih 

 fine but evident punctures ; second submarginal cell broader ; first 

 abdominal segment with very fine but evident punctures ; second abdo- 

 minal segment depressed about one-third ; hair of abdomen whiter, and so 

 more conspicuous. 



Hab. — Falls Church, Virginia, May 30. {Nathan Banks.) 



Melissodes saponellus, sp. nov. — 9 . Length about 1 1 mm., anterior 

 wing not quite 8 mm.; black, with very pale ochreous hair; disc of 

 mesothorax exposed centrally, shining and sparsely punctured, with the 

 bordering hairs black, but easily overlooked ; hair on inner side of hind 

 basitarsus clear ferruginous ; abdomen broad, the second and following 

 segments all covered with pale ochreous felt-like hair, the second with a 

 median dusky band, where the hair is thin enough to partially expose the 

 surface ; hind margins of the segments (tegument) pallid, that of the first 

 slightly iridescent, and grading into the black through a red suffusion ; 

 hair of fifth segment and sides of sixth a very pale but warm reddish, not 

 at all black or fuscous ; eyes green ; flagellum, except basally, bright 

 ferruginous beneath ; tegulte shining piceous ; maxillary palpi four-jointed, 

 the last joint minute. 



July, 1908 



