52 Trans. Acad. Set. of St. Lotas. 



and all the tarsi whitish, the spots on tegulae and knees some- 

 times wanting; antennae long, submoniliform, black; head 

 and thorax closely and finely punctured ; scutellum subbilobed, 

 with two mammiform eminences, metathorax very coarsely and 

 strongly rugose reticulated ; wings hyaline, nervures testaceous ; 

 abdomen shining and rather sparsely punctured on first seg- 

 ments, margins of segments depressed, narrowly pale testa- 

 ceous, segments two and three with more or less evident, 

 thin, interrupted, basal pubescent fasciae. Length 7-9 mm. 

 Carlinville, Illinois; 5 g specimens. 



Halictus similts Sm. 



Halictus similis Smith, Brit. Mus. Cat. Hym. 1 : 69. £. 1853. 



^. — Closely resembles the male of H. arcuatus. It is 

 more slender, the abdomen more shining, less closely punc- 

 tured, antennae testaceous beneath, a pale spot on tubercles, 

 tibiae pale at base and apex. Length 8 mm. 



Carlinville, Illinois; 1 $ specimen. 



NOMADA SALICIS 11. Sp. 



£. — Mandibles simple; antennae short, fourth joint twice 

 as long as third, joints 7-12 short ; head and thorax closely 

 punctured, abdomen shining, scutellum bilobed, basal nervure 

 ending beyond transverse median, apical segment of abdomen 

 bifid. Black, the lower part of face, mandibles except tips, 

 labrum, scape in front, front and lower border of pleura, 

 tubercles, two spots on scutellum, yellow ; anterior and middle 

 coxae in front, the knees, anterior and middle tarsi, anterior 

 tibiae in front, middle and posterior tibiae at apex, yellow ; 

 elsewhere the legs are more ferruginous, inclining to blackish 

 behind on middle and posterior pair ; wings hyaline, apical 

 border clouded, nervures and tegulae testaceous; abdomen 

 with six yellow bands, the last two interrupted laterally 

 so as to leave a small spot on each extreme side. Length 

 8 mm. 



Carlinville, Illinois; 1 $ specimen. 



Heriades Spin. 



H. cariuatus Cr. is a Trypetes. H. plnladelphi is a Che- 

 lostoma. Osmia bocconis Say belongs to Ashmeadiella . 



