Robertson — Neiu or Little Knowyi North American Bees. 51 



NOMADA RUBICUNDA OHv. 



Nomada rubicunda Olivier, Enc. M^th. Ins. 8: 365. 1811, 

 Nomada i-uhicunda 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. 



iV^oHiada o6?«7erato Cresson. Proc. Ent. 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. (^. 1897. 



This is a irood 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 wingf 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 Hue on post- 

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



Nomada articulata Sm. 



Nomada articvlata Smith, Brit. Mus. Cat. Hym. 2: 248. (^. 1854. 



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



2- — Very closely resembles the female of iV. ci'essonii ^ob . 

 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 ^j specimens. 



Nomada bisignata Say. 



Nomada bisignata Say, Long's 2nd Exp. 2: 354. 9. 1824; Bost. Journ. 

 1: 402. r^. 1853. 



This species cannot be identified. I can produce examples 

 of three species which show all of the characters indicated m 

 Say's description. 



Epeolus lunatds 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. 



