100 



4. Nomada intercepta. 



Male. Length 5 lines. — Black. The clypeus, the face on each side 

 of it, a line curving beneath the eyes, the mandibles, labrum, and 

 the scape of the antennae in front, bright yellow ; the flagellum 

 fulvous beneath. The margin of the prothorax, the tegulae, tuber- 

 cles, and a spot beneath them, two spots on the scutellum, a line 

 on the postscutellum, two spots on the metathorax, and the legs, 

 yellow ; the coxae and trochanters behind, and the femora and tibiae 

 within, black ; wings hyaline, the nervures ferruginous. Abdomen 

 with the base of the first and second segments black ; the apical 

 margins of the following segments narrowly rufo-fuscous. 



Hah. Vancouver's Island. 



This insect has a small elevated carina between the antennae : 

 it is probably a sexual distinction. 



5. Nomada volatilis. 



Male. Length 4-4| lines. — Head and thorax black, with yellow 

 and ferruginous markings ; abdomen ferruginous, with yellow 

 markings. The clypeus, a line at the lower portion of the inner 

 orbits of the eyes, the labrum and mandibles yellow ; the antennae 

 fulvous beneath ; the eyes with a minute ferruginous spot above. 

 A narrow line on the prothorax, the scutellum, tubercles, tegulae, 

 and legs ferruginous ; the intermediate and posterior femora black 

 at their base beneath ; wings hyaline, with their apical margins 

 fuscous, the nervures ferruginous. Abdomen black at the base, 

 with an interrupted fascia in the middle of the first segment, and 

 an interrupted fascia at the basal margins of the following segments, 

 yellow ; beneath, the apical margins of the segments are fusco- 

 ferruginous. 



Hah. Canada. 



6. Nomada albofasciata. 



Male. Length 3 lines. — Head and thorax black, abdomen dark 

 obscure ferruginous. The clypeus, labrum, and mandibles white ; 

 the flagellum fulvous beneath, the front with thin white pubes- 

 cence. Thorax with thin white pubescence ; wings hyaline and 

 iridescent, the tegulae and nervures ferruginous ; the anterior legs, 

 the intermediate and posterior tibiae and tarsi ferruginous, all more 

 or less black behind except the tarsi. The first segment of the 

 abdomen with a narrow white interrupted fascia in the middle ; 

 the second with a broad white fascia, attenuated in the middle at 

 its basal margin ; the abdomen thinly sprinkled with white pubes- 

 cence towards the apex. 



Hah. Canada. 



