AMERICAN DIPTERA. 23)^ 



obliquely downward toward the front coxae. Hal teres and a fan-like 

 row of bristles in front yellowish-white. Abdomen shining black, with 

 a bluish tint, and covered with fine, dense, yellow pile, not easily seen 

 unless viewed from profile. Pile of first two segments and lateral 

 margins of the rest longer. Posterior lateral margins of all the segments 

 golden pruinose, less so on the posterior segments. Second segment 

 of abdomen short, about as long as the first. Tip of abdomen with a 

 circle of long bristle-like hairs. Legs black, coxae grayish-white pru- 

 inose. Coxas and femora with whitish pile, that of hind femora with 

 a reddish tinge, tibiae and tarsi with shorter pile of a more reddish 

 tinge, bristles of tibiae and tarsi a trifle lighter than those of the femora, 

 a few on the tarsi black. Wings uniformly blackish." 



Type. — University of Nebraska. A single female specimen. 



Habitat.— Meadow, Nebr. (July, 1906, P. R. Jones). 



Mr. Jones states that the wing venation of this species is 

 identical with that of the figure of T. tagax Williston, Trans. 

 Am. Ent. Soc, Vol. XI, PI. I, fig. 6. That the gibbosity of 

 the face on the lower part is similar to that of fig. Ga of the 

 head, but the upper part and antennal prominence are barely 

 visible when viewed from profile. The third segment of the 

 antennae is not as broad as that of T. tagax. Mr. Jones places 

 this species in this genus with the reservation that he believes 

 that Triclis should not stand unless separated from Laphystia 

 by some other character than the closed posterior cell. 



CERATURGUS. 



Ceraturgus Wiedemann, Analecta Ent., 12, 1824. 

 Ceraturgus Wiedemann, Auss. Zw., I, 414, 1828. 

 Ceraturgus Macquart, Hist. Nat. Dipt., I, 288, 1834. 



Robust, nearly bare species with yellowish markings. An- 

 tennas porrect, apparently five- jointed; first and second seg- 

 ments subequal; third elongate; fourth, very short; fifth, fusi- 

 form or elongate and densely pubescent. Head much broader 

 than high; the gibbosity of the face reaching evenly to the 

 antennae: mystax in the female of neither abundant nor 

 strong bristles; in the male, of abundant, almost silky, hair 

 extending upward more thinly to the antennae. Vertex 

 strongly depressed; ocellar tubercle very prominent and bear- 

 ing a tuft of hair; occiput with weak bristles in the female; 

 in the male with more abundant hair. Proboscis held nearly 



TRANS. AM. ENT. SOC, XXXV. (.']0) JUNE, 1909. 



