Robertson — New or Little Known North American Bees. 51 

 Nomad a rubicund a Oliv. 



Nomada rubicunda Olivier, Enc. M6th. Ins. 8: 365. 1811. 

 Nomada rubicunda Cresson, Proc. Ent. Soc. Phil. 2 : 299. 1863. 

 Nomada torrida Smith, Brit. Mus. Cat. Hym. 2: 250. ?. 1854. 

 I have a female specimen taken at Orlando, Florida. 



Nomada obliterata Cr. 



Nomada obliterata Cresson, Proc. Eat. Soc. Phil. 2: 301. ?. 1863. 



Nomada bisignata var, obliterata Cresson, Trans. Am. Ent. Soc. 7 : 1879. 



Nomada bisignata var. obliterata Cresson, Synopsis 297. 1887. 



Nomada viburni Robertson, Trans. Acad. Sci. St. Louis 7: 341. tf. 1897. 



This is a good species. I did not capture the female until 

 after I had described the male. I have 2 $ and 6 ^ specimens 

 all agreeing with the type specimen in having the first two 

 submarginal cells united, except one which has two submar- 

 ginal cells in one wing and three in the other. One female 

 agrees with the description of the type. The other has more 

 yellow on face and metathorax, a line on each side of mesono- 

 tum over the tegulae, two spots on pleura and line on post- 

 scutellum yellow. Length $, 7-9 mm. ; $, 8-10 mm. 



Nomada articulata Sm. 



Nomada articulata Smith, Brit. Mus. Cat. Hym. 2: 248. J*. 1854. 



Nomada articulata Robertson, Trans. Am. Ent. Soc. 22: 124. 1895. 



5. — Very closely resembles the female of N. wessonWRob. 

 The third joint of antennae nearly equals the fourth, mesonotum 

 with less evident appressed pubescence, scutellum more densely 

 punctured and more crested, transverse yellow spot on fifth seg- 

 ment finely roughened and hardly shining, whereas in N\ cres- 

 sonii it is shining and sparsely and rather coarsely punctured. 



Carlinville, Illinois, 3 5, 16 $ specimens. 



Nomada bisignata Say. 



Nomada bisignata Say, Long's 2nd Exp. 2: 354. £. 1824; Bost. Journ. 

 1: 402. tf. 1853. 



This species cannot be identified. I can produce examples 

 of three species which show all of the characters indicated in 

 Say's description. 



Epeolus lunatus Say form concolor, n. f. 



Epeolus lunatus Say. Robertson, Trans. Acad. Sci. St. Louis 7: 342. 



The form name is proposed for the variety (?) having the 

 antennae, labrum, mandibles and legs dark. 



