82 THE CANADIAN ENTOMOLOGIST, 



(see West. Dipt., p. 228), and the only character he gives for separating 

 these two genera (1. c, p. 229) is that the second submarginal cell is ap- 

 pendiculate in Aph<xba?itiis, and not appendiculate in Triodites, but this 

 character frequently varies in different specimens of the same species, and 

 sometimes even in the different wings of the same specimen. The species 

 upon which these two genera were established (T. inus O. S., and A. 

 cervinus Lw.) do not offer any characters that would justify their separ- 

 ation into two different genera. 



In the following pages I have placed an exclamation point (!) after 

 those localities from which I have obtained specimens of the species. 



I. EucESSiA, n. gen. 



Antennae porrect, third joint when viewed from the side scarcely longer 

 than wide, somewhat oval in outline, but tapering to the tip, which is blunt 

 and bears a very short style, tipped with a short bristle ; first joint longer 

 than the second, but not one half as long as the third ; first two joints of 

 nearly an equal width, not much more than one half as wide as the third 

 at its base. Face retreating below, bare except on oral margin. Head a 

 little thicker than long, wider than the thorax, and fully three fourths as 

 large. Thorax with bristles in front of wings and on hind angles. Scu- 

 tellum rounded behind. Wings with two submarginal and four posterior 

 cells, all of the latter open, as is also the third basal ; small cross-vein 

 near middle of discal cell ; furcation of second and third veins occurs 

 before proximal end of discal cell. All of the tibiae provided with 

 bristles ; pulvilli pad-like. 



Encessia rube?is, n. sp. — $ . Front black, the lower half white polli- 

 nose, reddish or white pilose ; face densely silvery-white pollinose, the 

 upper part bare, oral margin white and reddish pilose ; proboscis not 

 projecting beyond hyperstoma. Antennal joints proiDortioned as 2, i and 

 6 ; first two joints reddish, the third black. Occiput white tomentose, 

 that in middle above, reddish. Thorax black, reddish tomentose, the 

 bristles also reddish ; pleura white pilose. Scutellum reddish, above 

 black, its tomentum and bristles reddish. Abdomen reddish, tomentum 

 concolorous except a white vittae on middle of dorsum and one on each 

 side ; pile of first segment white, dense on the sides, that on sides of othei 

 segments sparse, reddish ; venter reddish, its tomentum concolorous. 

 Legs reddish, tomentum concolorous, that on hind side of each femur and 



