352 Trans. Acad. Sci. of St. Louis. 



Megachile mendica Cress. 



Megachile mendica Cresson, Trans. Am. Eat. Soc. VII, 126, 9, 1878. 



? Megachile mendica Provancher, Faun. Eat. Can, Hym., 715, 9> 1883. 



^. — The male of this species closely resembles that of M. 

 hrevis, but is distinguished as follows : larger, vertex mesono- 

 tum and segments 2-5 of abdomen with black'hairs, abdomen 

 more sparsely punctured, edge of sixth segment with the two 

 median teeth sloping away rather equally on each side, about 

 as near to each other as to the lateral teeth, or nearer, 

 pubescence above yellowish or even fulvous varying to 

 whitish. Length 9-11 mm. 



Carlinville, Illinois; 27 5, 23 ^^ specimens; Can., U. S. 

 (Cress.). 



Megachile brevis Say. 



Megachile hrevis Say, Bost Jouro. N. II. I. 407, (f^$, 1837. 



The male of this varies in length from 7 to 11 mm. and in 

 color of the pubescence from quite fulvous to white. The 

 edge of the sixth segment has two median teeth like those of 

 a circular saw, convex exteriorly, or nearly so, falling away 

 suddenly within, nearer the lateral teeth than to each 

 other. 



I have 47 $, 43 $ specimens taken in Illinois and 5 $, 28 ^^ 

 specimens from Florida. 



The females from Florida {M. lanuginosa Sm.) have the 

 abdomen more shining, more sparsely punctured and with the 

 black pubescence more evident. With but two exceptions, the 

 male specimens differ from Illinois ones by showing black hairs 

 on vertex, mesonotum and especially on abdomen, which is 

 also more sparsely punctured. They agree, however, in the 

 teeth of sixth segment, but of course are more difficult to 

 separate from M. mendica $. Besides the teeth referred to 

 they are smaller and have the abdomen more closely punc- 

 tured than in M. mendica $. 



Ammobates Latr. 



Ammobates heliopsis $. 



Black, opaque, rather coarsely, densely and confluently 

 punctured ; face about antennae, cheeks, edges of pleura, sides 



