THE CANADIAN ENTOMOLOGIST. 245 



In form and appearance the species suggests T. trimaculatus, but 

 the hyaline wings, the abdominal markings and smaller size are distinctive-. 

 It lacks the large median white triangle on the second segment, so 

 conspicuous in sodalis. 



Leptomydus venosus, Lw.— The species of this genus seem not to be 

 easily recognized, because the sexes of each species are widely different, 

 and all the original descriptions were written from a single sex, some from 

 males and some from females. In the collection before me are the sexes 

 of a species, the male of which agrees very well with venosus. I give 

 below the descriptions of both sexes, hoping that such may be of use to 

 some future student of the group : 



Male. — Head and its appendages black ; face and front clothed with 

 long yellowish gray pile. Thorax black, with four light-coloured stripes 

 above ; anterior and middle legs black, with extreme bases of all the 

 tibiae yellowish ; broad bases of posterior femora and tibia3 yellow, other- 

 wise these legs are black or brown ; wings uniform dilute yellowish. 

 Abdomen reddish; posterior margins or all the segments narrowly yellow, 

 and on each side of the second segment the yellow margin surrounds a 

 small reniform black spot ; anterior margins of all the segments black ; the 

 first segment is wholly black, except the yellow hind margin, and on the 

 sixth and seventh segments the black is mostly confined to the sides. 

 Length 15 mm. 



Female. — Whole insect reddish-yellow ; eyes, proboscis and part of 

 front blackish ; thorax with light yellow stripes ; abdominal segments 

 margined behind with distinct light yellow ; on each side of the second 

 segment this yellow margin includes a small reniform black spot ; spines 

 at end of abdomen red; wings coloured as in the male. Length 19 mm. 



In both male and female the first posterior cells of the wings are 

 wide open. 



Habitat. — Both sexes taken in Oak Creek Canyon, June 30th. 



In the female the black proboscis, the lack of black stripes on the 

 literal margins of segments (two to seven) and the red spines at the end 

 of the abdomen serve to distinguish this sex from brachyrhynchus of Osten 

 Sacken. 



Myiolepta aurinota, n. sp. — Male. Length 9 mm. In general 

 coloration the antennae are reddish, but the first two segments are d'arker 

 and more shining than the third ; arista at base concolorous with the 



