H 



THE CANADIAN ENTOMOLOGIST. 177 



pleura, coxse and trochanters, more or less, and apices of femora and 

 tibise, yellow erigeronis. 



Holonomadd, gn. nov (Type Nomada siiperba, Cresson). 



Females. 



Metathorax entirely black 2. 



Metathorax with two yellow patches ; abdomen with five yellow 

 fasciae i . 



1. Mesonotum coarsely punctured, pubescent ; vein a before Vg; flagellum 



dark above affabilis. 



Mesonotum finely punctured, nearly bare ; vein a about interstiual 

 with V2 ; flagellum with a dark annulus vincta. 



2. Segments 1-5 with continuous yellow fasciaj \ vein a usually before 



Vj ; metathorax with dentiform lateral angles ; scutel acutely 



bilobed superba. 



Segment i black, or with ferruginous stain, 2-3 with interrupted, 4-5 

 with continuous bands ; vein a not before Vg ; scutel hardly bilobed; 

 joint 3 sometimes a little shorter than 4 ; small placida. 



Males. 



Metathorax and posterior orbits black, or nearly so 2. 



Metathorax with two yellow spots ; posterior orbits largely yellow. i. 



1. Scape obovate ; vein a usually interstitial with V., ; flagellum darker i:i 



the middle ; scutel subbilobed vincta. 



Scape ordinary ; vein a usually before V^ ; flagellum darker above ; 

 scutel bilobed affabilis. 



2. Segments 1-6 with continuous yellow bands ; vein a usually before 



V2 ; large species superba. 



Segments 5-6 with continuous, 2-4 with interrupted, yellow bands, i 

 entirely black ; vein a usually interstitial with Vj ; small 



species placida. 



Phor., gn. nov. (Type Nomada Integra, Rob.) integer. 



Heminomada, Ckll. (Type Nomada obliterata, CxQ^son) .obliterata. 



Xanthidium, gn. nov. (Type Nomada hiteola, Oliv.). 



Females. 

 Metathorax with subquadrate marks encroaching upon 



enclosure luteolum. 



Metathorax with subtriangular marks not encroaching upon 



enclosure luteoloidts. 



