1016.] NATURAL S< IIACES OF PHILADELPHIA. 501 



costal margin and the veins in the costal field with a fringe of long 

 golden hairs. Venation (Plate XXV, fig. 12; : Rs elongate, about 

 one-half Longer than the cell 1st M t . 

 Abdominal segments brownish yellow with a subterminal brownish 



black ring in the male, lacking in the female. 



Habitat- Eastern I'nited States. 



Holotype, d\ Maryland, near Plunmiers Island, July 21, 1915 

 (Alexander). 



Allotype, 9, Plummers Island, Maryland, July 21, 1915 

 (Alexander). 



Paratopotypes, 1 cf , 10 9 's, (McAtee and Alexander); paratype, 

 9 , Dead Run, Virginia, July 21, 1915 (McAtee); cf , Lost Mountain, 

 Cobb County, Georgia, July 13, 1913 (Bradley). 



Type in the collection of the author. 



This is probably the species that Osten Sacken referred to when 

 he said "immature specimens of a paler coloring (than sobrina), 

 with uniformly pale feet, and without any trace of a darker tinge near 

 the apex of the wings often occur." 3 These specimens do not 

 represent teneral insects, but fully colored specimens of both sexes, 

 some of them taken in copulation. Besides the pale coloration, the 

 elongate sector will distinguish the species fa om sobrina (Plate XXV, 



%• ID- 



Tribe Eriopterini. 



ERIOPTERA Meigen. 



Erioptera Meigen; Illigers Magazine, vol. 2, p. 262 (1S03). 



Erioptera (Erioptera) laticeps sp. n. 



Head very broad; coloration dark, the humeral triangles pale; 

 pleura marked with brown and yellow; abdomen banded brown ami 

 white ; wings nearly hyaline. 



Male. — Length, 4.6 mm.; wing, 3.8 mm. 



Female. — Length, 5 mm.; wing, 4 mm. 



The specimens are described from alcoholic material. 



Rostrum and palpi dark brown. Antennae dark brown, the 

 flagellar segments short-oval, more elongated toward the tip of the 

 organ. Head very broad, especially behind; frontal tubercle dis- 

 tinct. Head dark grayish brown, paler brown on the genae. 



Mesonotal prsescutum dark brown, the region before the pseudo- 

 sutural fovea? light yellow, triangular in outline; remainder of the 

 mesonotum dark brown, the scutellum yellow. Pleura mottled 

 brown and brownish yellow, the sternal region more brownish; a 



3 Monographs of the Diptera of North America, pt. 1, p. L19 L869 



