368 Descriptions and Records of Dees. 



middle of base of second very dark fuscous, beyond this it 

 consists of short dense warm ochraceous tomentum ; apical 

 plate (seventh segment) extremely broad, with a keel on each 

 side; venter with dark hair. The structure is essentially as 

 in X. fulva, Smith, including the venation. 



Dab. Guadalajara, Mexico (D. L. Crawford, 7106). 



Received from Prof. C. F. Baker. 



Nomada vicinalis aldrichi, subsp. n. 



cJ. — Runs in the table of Rocky Mountain Nomada (Bull. 

 9-4, Colo. Agr. Exp. Sta.) to N. vicinalis, Cresson, to which 

 it is very closely related, differing as follows : — Upper margin 

 of clypeus more or less black ; scape swollen ; mesothorax 

 wholly black ; scutellum black, with a pair of variable (large 

 or small) red spots ; hind femora with more black; basal part 

 of area of metathorax strongly wrinkled. From N. vicinalis 

 infrarubens, Ckll., it differs by the hair of thorax above only 

 slightly brownish ; scutellum and mesothorax as just indicated ; 

 first abdominal segment with a broad entire red band. The 

 lateral face-marks, clavate above, are much as in the supposed 

 male of N. cymbalarice, Ckll., but the scape is much stouter 

 than in the latter, which is, however, very closely allied. 

 The venter of the abdomen is red, with a heart-shaped black 

 mark on first segment, a black band at base of second, and a 

 large yellow spot on apical segment ; these markings vary 

 from distinct to obscure. The apical plate is broad, hairy, 

 and notched. The b. n. goes basad of the t.-m. 



JS r . subaccepta, Ckll., is also related, but differs fiom aldrichi 

 by its more prominent red scutellum, comparatively slender 

 scape, &c. 



The chrome-yellow markings of the abdomen are more 

 reduced than in true vicinalis. On the second segment they 

 are very large ; on the third variable, from large to very 

 small; on the fourth and fifth reduced or obsolete; on the 

 sixth well developed and confluent. 



Among Robertson's Illinois sr ecies it is nearest to i\ T . illinci- 

 ensis, Rob., which is a considerably smaller insect. The 

 female, when discovered, will doubtless prove to have the 

 head and thorax red. 



Dab. Moscow, Idaho ; two males in Philadelphia Acad. 

 Nat. Sci., " deposited by Wm. J. Fox." 



The insect is named after the well-known entomologist of 

 Idaho. 



