Robertson — Some Illinois Bees. 51 



nervure sometimes ending before the transverse median; 

 clypeus produced, third joint of antennae longer than next 

 two together, mouth parts long, maxillary palpi six-jointed; 

 labial palpi four-jointed, the joints long and subequal; tongue 

 long, filiform, pubescent. 



This may be the same as Cilissa americana Sm. The 

 male sometimes has a small yellow spot on the clypeus, and 

 on each side of the face. 



COLLETES BREVICORNIS Rob. 



Colletts brevicornis Robertson, Trans. Acad. Sci. St. Louis. 7 : 315. <^. 

 1897. 



$. — Agrees with the male in all respects, except that the 

 pubescence on the thorax above is mixed with blackish. 

 Length 9 mm. 



Carlinville, Illinois ; 5 $ specimens. 



The third joint of antennae is longer than any except the 

 last, and, of course, the scape ; second submarginal cell equal 

 to, or a little shorter than, the third, receiving the first re- 

 current nervure a little before the middle ; nervures usually 

 darker than indicated in original description. 



Sphecodes pimpinellae n. sp. 



$. — Black, llagellum, labrum, mandibles, tegulae, tibiae, 

 tarsi and abdomen red; mandibles dark at tips, with a denti- 

 form angle ; head broader than thorax ; face closely and rather 

 finely punctured, the clypeus with more sparse and more 

 coarse punctures; mesonotum with median impressed line, 

 roughened and indistinctly punctured in front, the disc shin- 

 ing, somewhat metallic, punctures more distinct; metathorax 

 shining, coarsely reticulated, with a semicircular inclosure 

 above; wings subhyaline, nervures and stigma fuscous; sec- 

 ond submarginal cell narrow; first recurrent nervure uniting 

 with second transverse cubital; abdomen shining, almost im- 

 punctate, fifth segment blackish. Length 7 mm. 



Carlinville, Illinois ; 1 $ specimen. 



Halictus arcuatus Rob. 



Balictus arcuatus Robertson, Trans. Am. Ent. Soc 20: 145. 9. 1893. 

 $. — Black, a transverse spot on clypeus, labrum, mandibles 

 except base, tegulae in front, knees, edges of anterior tibiae 



