Studies of North American Bees 1 1 



Allotype.— Type lot (No. 8464), J*. 



Paratypes. — Type lot (Nos. 8462, 8463), 2 J*; type locality, 

 August 30, 1914, on Solidago canadensis (O. A. Stevens, Nos. 

 8481 to 8490), I ?, 9 c^- 



Very close to A'', par at a Cresson $, and possibly only a sub- 

 i'.pecies of it, but apparently distinct in its smaller size (parata 

 is II mm. long), maculated venter, pale band on tergite i, flagel- 

 lum not dusky apically, etc. A^. libata Cresson $, differs from 

 inaculiz'cnter not only in the same characters as does parata^ but 

 also in the lack of a broad complete band on tergite 2, the longer 

 third antennal joint, the less strongly bigibbose mesoscutelkmi, 

 the wholly red cheeks, the more punctured tegulae and the incom- 

 plete mesoscutal band ; libata (^ differs in the lack of reddish 

 suft'usions on the face and of yellowish white spots on pro- 

 podeum, pleura and legs, and in the mostly red rather than largely 

 yellowish white venter. From the vernal A^. vallesina Ckll. $, 

 it differs in its shorter third antennal joint, less strongly punc- 

 tured tegulae, narrow second submarginal cell, maculated venter, 

 pale band on tergite i, etc. Close to A^. rhodoxantha Ckll. 5, but 

 differs from that species in the much paler (yellowish white 

 rather than yellow) maculations, the lack of yellow marks on the 

 collar, pleura or propodeum in the 5? the hind tibiae black behind, 

 the much narrowed second submarginal cell, rather smaller size, 

 etc. Also, it flies in late August while rhodoxantha flies in early 

 June. N. munda Cresson $, is quite distinct in the largely black 

 head and thorax, less bilobate mesoscutellum, immaculate venter 

 and lack of yellow on tergite i. 



Nomada (Heminomada) tricurta n. sp. 



5. Length 8-10 mm. Red; mandibles except tips, labrum, clypeus, 

 supraclypeus, line under eye, lateral face marks filling the space between 

 clypeus and orbits and extending narrowly to vertex (the mandibles, 

 clypeus and lateral face marks sometimes more or less suffused with red- 

 dish), collar, tubercles, tegulae, sometimes a tiny spot on propleura, s;me- 

 times spots on anterior and posterior corners of mesoscutum, usually spots 

 on lobes of mesoscutellum, large bars on each side of middle of propodeum 

 including enclosures, large anterior and smaller posterior spots on meso- 

 pleura which are sometimes narrowly connected, most of front of anterior 

 tibiae and spots on first four coxae, all of the knees and ends of middle 



165 



