NORTH AMERICAN HYMENOPTERA. 117 



SJpliecodes arveiisis Ritton, Am. Ent. iii, 230, 1880; HaUctus .smbrosus 

 Provaucher, Faun. Eut. Can. 700, 1883. 



This species, as well as S. falcifer Pttn. and mandlhtdnru Cress., 



is common in Illinois. 



Halictii!^ foxii : ILUictm gracilis Rob. (nee Morawitz), Trans. Am. Eut. Soc. 

 xvii, 31(i. 



Dedicated to Mr. Wm. J. Fox. 



Ilalictus macoupiiieiisis : Halicfus 'i-macn.ldiii.s Rob. (nee Schenk), Trans. 

 Am. Ent. Soc. xvii, 31G. 



Halictuis Tasciatus Nylauder. 



Smith, in Brit. Mas. Cat. Hym. i, 4S-9, makes this a synonym of 

 H. tumhlorum L. and credits H. fiavipes F. to America. Our species 

 is the N. fas('iafuj< Nyl. {H. ftavipe>< Thompson). 



IIalictU!$ stultus Cress. 



This species may be distinguished from all of the species of Hallctm 

 known to me by its abdomen, which is depressed, widest at third 

 segment, first two segments shining, third and fourth opaque and 

 evenly clothed with sparse, closely appressed hairs. 



Halicfus pilosus Sm. 



The % of this species is like the V , but less jjubescent. The 

 clypeus strongly produced ; the tlagellum beneath, apex of clypeus, 

 lal)rum, mandibles, knees, tibise at apex and tarsi yellowish testa- 

 ceous. It resembles % of ,H. fasciata.'<, but is smaller, legs less yellow, 

 and abdomen without fascine, etc. 



Halictus zepliyrus Sni. 



The 9 is uniformly brassy green and usually smooth and shining, 

 mesothorax sparsely and feebly punctured, disc of metathorax with 

 feeble rugse at base. The abdomen has appressed ochraceous pubes- 

 cence on each side of bases of second and third segments and over 

 fourth and fifth. I have taken the sexes in copula. 



Halictus nyinplirearilili : Halirtiis palnstris Rob. (lU'c Morawitz). Trans. 

 Am. Ent. Soc. xvii. 317. 

 Halit'tits platyparius 9- — Head and thorax dull greenish, the al>do- 

 men brownish. Ff.ce broad, wider between the eyes above than below, closely 

 and finely punctured above, more .sparsely punctured below : the clypeus short 

 and broad, not produced ; flagcUum stout ; cheeks broad, strongly produced to an 

 angle below ; the flagellum, mandibles, tegulse and nervures, and legs dull testa- 

 ceous ; prothorax with short lateral angles, mesothorax smooth and shining, finely 



TRANS. AM. ENT. SOC. XXII. MAY. 1895. 



