304 PROCEEDINGS OF THE ACADEMY OF [1895. 



been made. To Mrs. Slosson for the generous loan of specimens. 

 To Prof. J. M. Aldrich for the determination of the Dolichopodidse. 

 To Prof. Riley for the privilege of looking over the collection of the 

 U. S. National Museum, and to Mr. Chas. Robertson, Mr. W. A. 

 Snow, Dr. S. W. Williston, Mr. W. D. Hunter, and others, for 

 kind assistance. 



DESCRIPTIONS OF NEW SPECIES. 



BY C. W. JOHNSON. 



Nemotelus immaculatus n. sp. 



Length 4 mm. , $ . Face and vertical triangle blackish ; eyes of 

 a dull brown color (probably much lighter than in the living speci- 

 men); antenna? yellow; proboscis red, unusually long, with an acute 

 angle, the two portions thus formed being of almost equal length, the 

 outer half is curved downward and the basal part of the other is some- 

 what enlarged. Thorax black, with sparse whitish pubescence most 

 prominent on the pleura?; scutellum black; abdomen greenish white, 

 immaculate. Legs light yellow ; wings hyaline, whitish. One speci- 

 men, St. Augustine (F. H. Genung). . 



Nemotelus slossonae n. sp. 



Length 3 mm. , S . Face and vertical triangle black, shining; 

 facial protuberance very prominent, conical ; frontal triangle brown. 

 The upper portion of the eye with large facets brown, the lower 

 third with small facets blackish; antenna? dark brown. Thorax and 

 scutellum black, shining; a narrow light yellow lateral line extends 

 from the humerus to the posterior angle. Abdomen yellowish white; 

 a central mark on the first segment below the scutellum, a dorsal 

 triangle and a small spot near the lateral margin of the fourth, and 

 the fifth except a narrow lateral and posterior margin black; in one 

 specimen there is a minute brown dot near the anterior augle of the 

 third segment. Venter whitish. Legs black; tip of the femora, 

 base and tip of the tibia?, and the tarsi whitish; wings hyaline, whit- 

 ish; discal cell emits four veins. 



Two specimens, Charlotte Harbor, March. To Mrs. Annie T. 

 Slosson, who has done so much to further our knowledge of the 

 Diptera of Florida, this species is dedicated. 



Leptogaster cbscuripennis n. sp. 



Length 13 and 14 mm., $ 9 . Head brown; face, front, inferior 

 orbits and occiput covered with a dense grayish pubescence; pro- 



