ZooL.— Vol. II.] WHEELER— DOLICHOPODID^. 69 



on its lower anterior surface in one row, five to seven spines in the broader 

 basal portion of the femur are considerably longer than the other spines, 

 which are inserted in two or three irregular rows. Tooth-like black spines 

 on the lower surface of the fore tibia well developed. Wings hyaline, anterior 

 and posterior margins parallel. Venation normal, veins black, yellow at their 

 roots, where the wing membrane, too, is suffused with yellow. Halteres and 

 tegulce yellow, the former with slightly infuscated pedicels, the latter with 

 white cilia. 



Female. Length 2.5-2.75 mm.; length of wing 3.5-4 mm. The dust on 

 the lower two-thirds of the face is ochre-yellow, more whitish towards the 

 orbits. The armature of the fore legs is like that of the male. 



The species was taken in considerable numbers about 

 damp spots at the following localities in Wyoming during 

 August and September: Lusk, Ft. Caspar, Natrona Co., 

 Dubois, Hunter's Creek, Black Rock Creek. 



It is certainly very closely related to Loew's H. innotatus 

 from Sitka; Loew's species, however, has the knob of the 

 halteres blackened, black bristles on the upper half of the 

 fore cox£e, and the veins of the wing "black up to the 

 extreme root." His description of the spines on the fore 

 femur is not sufficiently explicit. 



Thinophilus Walker. 



Mik in his Dipterologische Untersuchungen ^ attempts to 

 establish a new genus, Sckoenophilus, on those species of 

 Walker's original genus, Thinophihis, which have a more 

 apical arista, only two scutellar bristles, only four mesial 

 dorsal bristles in either row, and the humeral bristles poorly 

 developed. In Thinophilus, as redefined by Mik, the anten- 

 nal arista is distinctly dorsal, there are four scutellar bristles, 

 six mesial dorsal bristles in each row, and the humeral 

 bristles are distinct. The American species that may be 

 assigned to these genera have been little studied as yet. 

 Only two forms are known to me, one described as Thino- 

 philus pectinifer'^ Wheeler and the one here described as 

 T. neglectus. They evidently belong to the same genus, 



iwien., 1878, p. 9. 



*Entom. News, May, 1896, pp. 155 and 156. 



