NO. 1674. DESC'RfPTIONS OF SOME BEES—COCKERELL. 417 



In Acamptopauvi " the body is somewhat hairy, the basal nervure 

 meets the transvorsoiueclial, and the second submarginal cell is 

 scarcely longer than the first. In all this there is close approximation 

 to Perditomorpha, but in other respects the bees are not very similar. 



In Splnoliella {S. zebrata Cresson, S. obscureUa Cresson) the vena- 

 tion is essentially as in Oamptopceum, and the middle tibial spur 

 (female) is very finely denticulate. 



In Psamythia {P. philanthoides Gerstaecker, P. annulata Ger- 

 staecker) the middle tibial spur is strongly obliquely dentate; the 

 basal nervure almost meets the transversomedial in P. philanthoides, 

 but falls some distance short of it in P. annulata. 



In Hypomacrotera the end of the marginal cell is as in Perdito- 

 morpha^ but the basal nervure falls short of the transversomedial. 



In Greeleyella the basal nervure meets the transversomedial, but 

 the end of the marginal cell is not at all as in Perditomorpha^ and the 

 first recurrent nervure meets the first tranversocubital. 



In Hesperapis the shape of the third discoidal cell and the end 

 of the marginal are very different from those in Perditomorpha. 



Parandrena is easily known from Perditomorpha by the broad 

 fovese, which are as in Andrena. 



All things considered, Perditomorpha is nearest to Acamptopceum^ 

 but apparently sufficiently distinct. Should they be merged, Ash- 

 mead's genus has priority. 



In regard to the mouth parts Perditomorpha runs in the table in 

 Annals and Magazine of Natural History, July, 1902, p. 42, to Hes- 

 perapis., to which it is not closely allied. 



PERDITOMORPHA BRUNERII Ashmead. 



Female. — Length 9-10 mm.; Andrena-Y^k^ in appearance; black, 

 with a shining ferruginous-red abdomen; pubescence rather short, 

 white, fuscous at apex of abdomen, a few infuscated hairs on scutel- 

 lum, more or less fuscous on middle tibise in front, and coarse and 

 strongly fuscous on upper outer side of hind tibia3. The white hair 

 of the face, cheeks, pleura, and sides of metathorax is abundant and 

 conspicuous. Head broad, facial quadrangle about square, the inner 

 orbits practically parallel ; clypeus shining, densely punctured, with a 

 median raised line ; no Andrenif orm facial f ovese ; front closely punc- 

 tured ; sides of vertex shining, with a considerable impunctate area ; 

 ocelli rather large, in an extremely low triangle ; antennai very short, 

 scape black, flagellum black basally and suffused with black above, but 

 otherwise deep chestnut-red ; second antennal joint rather large ; third 

 much longer than fourth, the latter being broader than long; labrum 



«Cockerell, Trans. Am. Eat. Soc, XXXI, 1905, p. 320. 

 Proc.N.M.vol.xxxvi— 08 27 



