Robertson — Nttrth American Bees. 321 



space which is smooth and shining; wings slightly dusky, 

 nervures, stigma and tegulae rather dull testaceous; legs black 

 or dull ferruginous, abdomen shining, finely punctured 

 towards apex, first three segments red or yellowish red, the 

 remaining segments the same, or blackish. Length 5-6 mm. 



Illinois; 2 $ specimens. 



This species is separated from S. mandibularis and S, 

 stygius on account of its large size and the unusually short 

 disc of metathorax. 



SpHECODES 8MILACINAE $. 



Entirely black, shining ; head closely and finely punctured, 

 the clypeus with more coarse sparse punctures ; mandibles 

 bidentate, dull rufous; labrum dull testaceous, short, slightly 

 emarginate; flagellum dull testaceous beneath; mesonotum 

 and scutellum shining, sparsely punctured, punctures coarser 

 than on head; disc of metathorax with irregular longitudinal 

 raised lines, smooth and shining beyond ; wings fusco-hyaline, 

 nervures, stigma and tegulae dull, second submarginal cell 

 short, hardly narrowed above; legs dull ferruginous; ab- 

 domen shining, segments one and two impunctate, third finely 

 punctured at base. Length 5 mm. 



Illinois; one j specimen. 



Halictus Latr. 



Halictds foxii Rob. 



Halictus gracilis Robertson, Trans. Am. Ent. Soc. XVII, 316, (f»$,1890 



(nee Morawitz). 

 Halictus foxii Robertson, Trans. Am. Ent. Soc. XXII, 117, 1895. 

 Halictus gracillimus Dalla Torre, Cat. Hym. X, 63, 1896. 



Halictus 4-MACcrLATU8Rob. 



Halictus 4-maculatus Robertson, Trans. Am. Ent. Soc. XVII, 316, (^ $ , 1890. 

 Halictus macoiipinensis Robertson, Trans. Am. Ent. Soc. XXII, 1895. 

 According to Dalla Torre, Cat. Hym., X, 65, Halictus 

 quadrimacHlaliLS Schenck is the same as H. interruptus Panz. 



Halictus nymphaearum Rob. 



Halictus palustris Robertson, Trans. Am. Ent. Soc. XVII, 317, cf $, 1890 



(nee. Mor.). 

 Halictus nymphaearum Robertson, Trans. Am. Ent. Soc. XXII, 117, 1895. 

 Halictus paludicola Dalla Torre, Cat. Hym. X, 75, 1896. 



