Robertson — North American Bees. 337 



strongly rugose on the disc, especially the inclosed space, 

 which is poorly defined; wings yellowish hyaline, nervures, 

 stigma and tegulae exteriorly testaceous, second submarginal 

 cell half as long as third, receiving recurrent nervure at, or 

 beyond, the middle ; legs black, hind tibiae and middle and 

 hind tarsi dull ferruginous, scopa pale ; abdomen shining, 

 rather closely and finely punctured, apical margins of seg- 

 ments narrowly dull testaceous, without pubescent fasciae, 

 2-4 medially depressed nearly two-thirds their width, anal 

 fimbria fulvous. Length 10-11 mm. 



Carlinville, Illinois; 9 $ specimens. 



In its facial grooves this species resembles A. nuda and A. 

 rugosa. The second segment of abdomen is not so widely 

 depressed as in those species. 



Parandrena. 

 This is proposed as a new genus of Andrenidae for the 

 reception of Panurgus andrenoides Cress. It has all of the 

 characters of Andrena except that the wing has two submar- 

 ginal cells. 



Parandrena andrenoides Cress. 



Panurgus andrenoides Cresson, Trans. Am. Ent. Soc. VII, 62, J*, 1878. 



Panurgus nevadensis Cresson, Trans. Am. Ent. Soc. VII, 214, (^, 1879. 



Panurgus 9 andrenoides Robertson, Trans. Am. Ent. Soc. XXII, 121, cJ*?, 

 1895. 



Carlinville, Illinois; 28 $, 36 ^ specimens; Col.,Nev., Tex. 

 (Cress.). 



This is little more than a section of Andrena^ only showing 

 as a constant character what is an occasional variation in that 

 genus, for some specimens of Andrena have the second and 

 third submarginal cells united in one or both wings. Halictus 

 anomalus and Sphecodes antennariae have only two submar- 

 ginal cells in the few specimens known. Some individuals of 

 Sphecodes mandihularis show the same variation. 



Parandrena wellesleyana. 



$. — Differs from female of preceding in its somewhat larger 

 size, tooth of mandibles nearer the apex, basal process of 

 labrum more spinous, clypeus more strongly punctured, 



