360 THE CANADIAN ENTOMOLOGIST. 



Habitat. — Medicine Hat, Alberta, Canada. One specimen 

 collected by Mr. J. R. Malloch. Type Cat. No. 15212, U.S.N.M. 



This species in general appearance, very closely resembles 

 Neolarra pruinosa, but in addition to the generic differences, 

 differs also in the dark tegulse, the carina on the propodeum more 

 elevated, the appressed pubescence not covering the abdomen, etc. 

 P. vigilans and P. nanus are both smaller, with light coloured 

 tegulae and with the appressed pubescence covering abdomen; 

 P. vigilans also has the carina on the propodeum indicated at base 

 only, the process on metanotum only indicated, etc. 



Perdita canadensis, new species. — Female. Length about 

 9 mm. Head blue-green, thoracic notum green, pleurae blue- 

 green; clypeus and labrum black, the former with purplish tinges, 

 smooth, with a few fine punctures and produced anteriad of a line 

 connecting the lower ends of eyes fully one-third the length of 

 the distance between eyes at lower ends; face without markings;, 

 antennae dark, scape with a narrow yellow line, apical joints of 

 flagellum reddish beneath; pubescence of head and thorax long, 

 erect, strongly tinged with ochraceous; collar with two small 

 yellow spots; tubercles dark; wings milky white; veins hyaline; the 

 stigma and costal vein light brown; first recurrent vein inter- 

 stitial or almost so; legs dark, anterior knees and a short narrow 

 stripe on anterior tibiae yellow; pubescence on outer side of legs 

 greyish, on inner side ochraceous, on tarsi reddish; first abdo- 

 minal segment with a small yellow spot on each side; segments 2-5 

 with yellow bands, the ends of which are turned caudad on seg- 

 ments 3-5; band on second segment dilated laterally so that the 

 posterior margin is diagonal; bands on segments 2-3 notched 

 medially on posterior margin; pygidium broad at apex with the 

 apical martin emarginate. 



Habitat. — Medicine Hat, Alberta, Canada. Two females 

 collected by Mr. J. R. Malloch. Type Cat. No. 15213, U.S.N.M. 



This species belongs to the group with albipennis Cresson, 

 ladeipennis Swenk and Cockerell, and pallidipennis Graenicher; 

 it differs from all of them in the dark face and other markings; 

 albipennis and pallidipennis have the first recurrent vein received 

 by the second submarginal cell and the pygidium rounded apically; 

 albipennis has the clypeus produced hardly half as much as cana- 

 densis; pallidipennis has it produced about as much; lacteipennis 

 has the clypeus produced about as in albipennis the first recurrent 

 vein received by the second submarginal cell and the pygidium 

 emarginate at apex. Of the value of this last character I am at 

 present doubtful. 



