38 Annals Entomological Society of America [Vol. VI, 



third joint lacking; (I find it small and the arista brown) front and 

 occiput black, thickly covered with silvery white dust; post-ocular cilia 

 white; eyes green. Thorax, scutellum, and abdomen reddish yellow, cov- 

 ered with white dust, which is most abundant on the lateral portions 

 of the thoracic dorsum and the pleurae ; prescutellar depression shallow ; 

 scutellum with two median long bristles and two feeble lateral bristles. 

 Abdomen covered with short black hairs; pleuras with a black spot 

 below the root of the wing. Coxae reddish yellow dusted like the pleurae; 

 anterior surface of the fore coxae beset with short white hairs, and a few 

 conspicuous black bristles near their proximal ends; similar bristles 

 occur in a corresponding position in the middle coxae; hind coxffi with a 

 single bristle on the lateral surface, and a few bristles near the tip. 

 Legs and metathoracic epimera light yellow; the femora very slender 

 and covered with small black hairs; last joint of all the tarsi black; fore 

 tarsi twice as long as the fore tibiae ; middle tarsi nearly twice as long as 

 the middle tibiae; hind tarsi scarcely as long as the hind tibiae, hind 

 metatarsi distinctly shorter than the succeeding joint. Wings scarcely 

 narrowed towards the base, distinctly yellowish, and with yellow veins; 

 apical segment of fourth vein rather sharply bent upwards near its 

 middle, ending rather close to the tip of the third vein; posterior cross- 

 vein about two and one-half times its length from the posterior margin 

 of the wing, measured along the distal segment of the fifth vein. Halters 

 and tegulae yellow, the latter with yellow cilia." 



In the above description Prof. Wheeler .states that the wings 

 are scarcely narrowed towards the base. I find in all the 

 species that I have seen that where the wings of the male are 

 narrowed at base so as to leave little or no anal angle that the 

 wings of the females are normal, and have the anal angle prom- 

 inent, as is the case with this species. Male described from 

 three specimens, one in the collection of Prof. Aldrich, taken 

 by Mr. Daecke, at Philadelphia, Pa.; one received from Mr. 

 Daecke and taken by him at Perdix, Pa., on June 10; the 

 other in the National Museum collection, and taken on Mt. 

 Washington, N. H., by Mrs. Slosson. I have seen females 

 from the following states: Me., N. H., Vt., N. J., N. Y., Pa., 

 Md., Del., Va., N. C, Ohio, Mich., and Canada. Prof. Wheeler 

 also mentions Illinois. 



Note. — In Prof. Aldrich's Catalogue of North American 

 Diptera, floridiila is placed as the female of carbonifer, but after 

 careful study of the material in my hands I prefer to place 

 floridula as a distinct species, and place the male described 

 above with it, as they agree in all essential characters, except 

 those points which usually form the sexual distinction. 



