williston: new diptera. 73 



legs are light yellow; bristles chiefly black, not conspicuous, several 

 long ones on the* outer side of the front tibiae. Wings pure hyaline, 

 the distal end only slightly tinged with blackish. 



Length, 15-16 mm. 



Pennsylvania. 



A single male from Connecticut is apparently the same. It is 

 smaller {12 mm.); the pollen of the face is yellow and the hair wholly 

 black; the abdomen is slender, shining black, e.xcept the sides and 

 posterior margins; and the hypopygium is rather more slender than 

 usual and directed upward. 



Asilus (Neoitamus) distinctus, n. sp. 



Male, female. Face narrow, in profile with a short concavity 

 below the antennae, thence gently convex to the oral margin, but 

 receding so that the border is nearly parallel to the border of the eye, 

 the concavity less than half the length of the convexity; covered with 

 light yellow pollen, the black ground-color of the gibbosity showing 

 through somewhat; in the middle of the gibbosity, save a few black 

 hairs at the top, with moderately long, abundant, light yellow hair. 

 Antennae black, the first two joints with black hair; second joint 

 considerably shorter than the first; third joint hardly as long as the 

 first two together, gradually narrowed to the tip, the bristle thickened, 

 shorter than the third joint. Front black, lightly grayish pollinose and 

 with black hair; occipito-orbital bristles fine, hair-like, black; beard 

 not long nor abundant, light yellow; occiput gray pollinose. Thorax 

 black, gray pollinose; dorsum with two moderately broad, black 

 stripes, narrowly separated, and, on each side, a large oval spot in 

 front and behind the suture; on the front side with moderately long, 

 but not abundant, black hair; on the posterior with longer black hair 

 and thin black bristles. Scutellum with hair on its dorsum and a 

 row of thin black bristles on its border; trichostical bristles hair-like, 

 light colored. Abdomen shining bluish black, the narrow posterior 

 border of the segments gray pollinose; on the sides of the segments 

 with long white pile, and, in front of the posterior gray margin, with 

 white bristles; hypopygium with short black pile; ovipositor rather 

 long. Legs rather slender; black, with black bristles; all the tibiae 

 and metatarsi, except the tip, yellow. Wings hyaline, the outer end 

 only lightly clouded. 



Length, 13-16 mm. 



Numerous specimens, New Hampshire, Connecticut. 



Asilus (Neoitamus) afflnis, n. sp. 



A single specimen from Washington agrees in most respects closely 

 with distinciusj and I would be tempted to call it the same, were it 



