70 WILLISTOX: NEW DIPTERA. 



Asilus astutus. n. sp. 



Male, female. Face broad; in profile very gently convex on the 

 lower half and as gently concave above; densely covered with light- 

 yellow pollen; the mystax does not extend one-half of the distance to 

 the antennae; on its upper part composed of sparse black, along the 

 oral margin of light yellow , bristles, sometimes wholly light colored. 

 Antennae black, the first two joints with short light yellow and black 

 hair, the third joint distinctly longer than the first two together; 

 bristle short, style-like, not longer than the first joint. Front pol- 

 linose like the face, and with light colored hair, except a few black 

 hairs on the ocelli. Occiput and occipito-orbital bristles light yellow; 

 beard more nearly white, abundant. Ground-color of the thorax black, 

 but densely covered with light ochraceous pollen, the median stripes 

 and usual spots apparent; dorsum clothed in front with very short, 

 sparse, black hair; behind with not very abundant nor long, but mod- 

 erately stout, chiefly black bristles; about four on the border of the 

 scutellum; the sparse vestiture of the pleurae wiiolly liglit colored. 

 Abdomen not slender nor much elongated; densely covered uniformly 

 with light ochraceous pollen and moderately abundant, recumbent, 

 light yellow hair; on eacli side and in the middle, toward the front 

 of each segment, with a small, oval, brown spot; hypopygium and 

 ovipositor small, red; there are no bristles on the abdomen, except a 

 few short ones on the sides of the second segment. Legs stout, red, 

 but the color obscured beneath abundant, close-lying, whitish hair; 

 the femora, except broadly on the posterior side, the tibiae broadly 

 in front, but not reaching the base, and the tip of all the tarsal joints 

 black; bristles black. Wings distinctly clouded with a blackish 

 tinge, along the veins in the central portion i)ure hyaline. 



Length, 15 mm. 



California. 



Asilus annulatus, n. sp 



Face in profile with a "well-marked gibbosity below the antennae, on 

 the lower part strongly gibbose, thickly covered with yellowish white 

 pollen and on the gibbosity with thin black bristles above, and light 

 yellow ones below. Antennae black, the first two joints with black 

 hair; first joint but little longer than the second, third scarcely longer 

 than the first two together; arista but little more than half the length 

 of the third joint. Front scarcely narrowed above, ochraceous pol- 

 linose, with black hair. Occipito-orbital bristles black above; beard 

 white. Occiput thickly yellowish white poUinose. Thorax grayish 

 yellowish pollinose; dorsum with two dark brown stripes, separated by 

 a linear interval and narrowed and coalescent behind; on each side, 



