Robertson — North American Bees. 353 



of methathorax, sides of prothorax extending upon mesono- 

 tutn, median impressed line of mesonotum ; borders of scutel- 

 lar lobes and coxae with whitish scale-like pubescence ; abdomen 

 as long as head and thorax, the latter wider than head, scu- 

 tellum bilobate ; mandibles, labrum, apex of clypeus, flagel- 

 lum, tubercles, tegulae, anterior tibiae and tarsi, knees, tips 

 of middle and hind tibiae, narrow edges of ventral segments 

 and the apical segment of abdomen ferruginous; wings sub- 

 hyaline, apex clouded, nervures and stigma black ; marginal 

 cell about equaling submarginals together, rounded and 

 appendiculate at apex; second submarginal cell about one- 

 third shorter than first, narrowing nearly two-thirds towards 

 marginal, the recurrent nervures uniting with the transverse 

 cubitals; abdomen black, apical margins of segments with 

 narrow fasciae, rufous passing into golden, first segment with 

 a lunate white patch on each side, 2-5 with four equidistant 

 subbasal white patches. Length 6 mm. 

 Carlinville, Illinois ; 1 $ specimen. 



Synhalonia Pttn. 

 Synhalonia atriventris Sm. 



Melissodes atriventris Smith, Brit. Mus. Cat. Hym. II, 310, tf, 1854. 

 Melissodes nigripes Smith, Brit. Mus. Cat. Hym. II, 311, £ (ion c?)t 



1854. 

 Melissodes dubitata Cresson, Proc. Acad. Sci. Phil. 1878, 194, £ (non <$). 

 Synhalonia atriventris Cresson, Synopsis, 305, cf £ (third line from top), 



1887. 



Carlinville, Illinois; 33 §, 8 ^ specimens; Algonquin, 111. 

 (Nason), U. S. (Smith), Ga. (Cress.). 



The pubescence of legs, especially the scopa, varies from 

 fulvous through fuscous to black. I have examined the types 

 of M. dubitata in Coll. Am. Ent. Soc. 



Melissodes Latr. 

 Melissodes dentiventris Sm. 



Melissodes dentiventris Smith, Brit. Mus. Cat. Hym. II, 312, tf, 1854. 



§. — Black, pubescence on head, thorax and basal segment 

 of abdomen above long and fulvous ; on the clypeus, labrum, 

 head beneath, some hairs on vertex and a few short one3 on 

 disc of mesothorax and scutellum, thorax beneath, legs and 



