26G Mr. T. D. A. Cockerell — Descriptions and 



xoliich is 'produced into a hroad heaJc-like structure, perfectly 

 entire, its point forming somewhat more than a right angle, 

 and curved downwards ; beneath, the segment presents two 

 large oblique teeth on each side, the inner the larger, and in 

 the broad median interval ap))ears the stout spine-like process 

 of the seventh segment. Four ventral segments are visible. 



Related to M. reflexa, Cresson, but differs in the colour of 

 the legs and pubescence. It cannot be the male of M. populi, 

 as the sculpture of the thorax is quite different, and the 

 venation of the hind wings differs. 



JIah. Boulder, Colorado, Aug. 9, 1906 ( \V. P. Cockerell). 



Megachile onohrychidisj sp. n. 



^ . — Length 81- mm. 



Black, with dull white hair, dense and pure wdiite on face 

 and lower part of cheeks and pleura ; no black or fuscous 

 hair, that on inner side of tarsi orange ; vertex shining, ivith 

 strong well-stparated punctures ; antennas slender, black, 

 flagellum faintly reddish beneath, not flattened or expanded 

 at apex ; mandibles with a reddish spot just before tip ; first 

 joint of labial palpi shorter than second ; mesothorax very 

 densely punctured ; tegula3 very dark reddish, with a white 

 patch of hair in front. Wings moderately dusky ; second 

 r. n. joining second s.m. a considerable distance from its 

 end. Legs black ; anterior femora with no red patch, their 

 tibiee faintly reddish on inner side, their tarsi simple ; coxal 

 spines strong but rather short ; hind tarsi slender. Abdomen 

 short, rather shining, with narrow white hair-bands ; in 

 addition to the usual apical bands there are distinct, but less 

 pronounced basal ones ; sixth segment above very densely 

 punctured, with fine whitish tomentum, and a pit or depression 

 in the middle just before the transverse keel, which is jagged 

 apically, and with a slight rounded emargination ; beneath, 

 the lateral teeth are very low, the points of the inner ones 

 scarcely more distant than they are from the lateral ones ; 

 median projection of seventh segment small, but evident ; 

 four ventral segments. 



Hah. Mesilla Park, New Mexico. 



On the Agricultural College farm, April 25, 1^95, I 

 observed what I supposed to be a single species of Megachile 

 visiting the flowers of Onohrychis sativa in some numbers, 

 these flowers being the only ones at which 1 had so far 

 obtained Megachile that year. Two specimens were caught, 

 and these now ]nove to belong to different species, M. ono- 

 hrychidis and M. schisniatura. 



