350 Trans. Acad. Sci. oj St. Louis. 



pubescence; clypeus rather short and flat, opaque, closely 

 punctured, with a median raised line, space above shining 

 and sparsely punctured, apical margin slightly emarginate ; 

 edsre of cheeks beneath with a row of long incurved hairs; 

 head beneath smooth, shining and impunctate, on each side of 

 tongue fossa; vertex swollen, shining, rather sparsely punc- 

 tured ; antennae and mandibles black, the latter triden- 

 tate; mesonotum and scutellum shining and rather sparsely 

 punctured on the disc, scutellum swollen ; space on meta- 

 thorax above opaque, impunctate, fossa shining below ; wings 

 a little dusky, more so towards tips ; submarginal cells sub- 

 equal, second receiving one recurrent about one-fourth from 

 base and the other about one-fifth from apex ; nervures fus- 

 cous, tegulae black; legs with pale pubescence, yellowish on 

 tarsi beneath; abdomen rounded at base, with a median 

 impressed line, basal segments sparsely punctured on the disc, 

 1-5 with apical fasciae of white pubescence, interrupted and 

 wider on sides of 1-2, ventral scopa white. Length 9 mm. 

 . Carlinville, Illinois; one ^, one $> specimen; Georgia 

 (Cress.), N. Y. (Morse). 



The female may be separated from that of A. producta by 

 its swollen scutellum, etc. 



Megachile Latr. 

 Megachile inimica Cress. 



Megachile inimica Cresson, Trans. Am. Ent. Soc. IV, 267, £, 1872. 



Megachile pugnata Cresson, Trans. Am. Ent. Soc. IV, 264, tfQ, 1872. 



Megachile sayi Cresson, Trans. Am. Eat. Soc. VII, 119, tfQ, 1878. 



U. S. (Cress.) I have four $ and twelve 5 specimens. 

 Some specimens have the pubescence quite as yellow as in 

 the description of M. inimica, but usually it is more white. 



Megachile optiva Cress. 



Megachile optiva Cresson, Trans. Am. Ent. Soc. IV, 268, 9, 1872. 



? Megachile optiva Provancher, Faun. Ent. Can. Hym. 715, <j?, 1883. 



Megachile petulans Cresson, Trans. Am. Ent. Soc. VII, 127, tf, 1878. 



Carlinville, Illinois ; five 5, twenty-eight ^ specimens; Can., 

 N. C, Ga., Fla., Tex. (Cress.). 



The $ varies in length from 8-11 mm. and in color of pubes- 

 cence from yellow to quite white. Provancher distinguishes 



