512 



ish yellow, trochanters and bases of femora pale yellow. Wings 

 slightly grayish, veins brown, base of wing, including bases of veins, 

 whitish yellow. Halteres yellow, knobs brown. Body hairs pale 

 brown. 



Flagellar joints elongate, basal 2 fused, sensory organs hairlike. 

 Pronotum of moderate breadth, without central dorsal excision. Disc 

 of mesonotum (between the vittaj) and of scutellum with long sparse 

 hairs; posterior half of the former with pale pruinescence. Legs 

 rather stout; basal joint of fore tarsi half as long as fore tibiae; em- 

 podium about as long as claws, distinctly fringed. Third vein ending 

 very slightly beyond beginning of apical curve of wing and nearly in 

 line with apex of upper branch of cubitus ; cross vein distinctly before 

 wing-middle, slightly acute ; cubitus forking distinctly beyond cross 

 vein, its posterior branch slightly bisinuate. 



Length, 1.25 mm. 



Tvpe localitv, LTrbana, 111., August 23, 1914, on window (C. A. 

 Hart and J. R. Malloch). 



7. Camptocladius subaterrimus, n. sp. 



Male. — Black, subopac[ue. Antennae and their plumes fuscous. 

 Mesonotum yellowish between the vittae and on lateral anterior angles ; 

 upper central portion of pleurae yellow. Abdomen black. Legs slen- 

 der, fuscous, tibiae and tarsi yellowish brown. Wings clear, veins 

 brown but black at base. Halteres yellowish brown. Body hairs 

 brown. 



Pronotum of moderate breadth, central dorsal excision weak. Hy- 

 popygium as in Figure 3, Plate XL. Legs very slender; fore tarsi 

 without long hairs, basal joint slightly more than half as long as fore 

 tibiae (16: 28) ; mid and hind legs with long hairs; empodium distinct, 

 rather densely fringed. Wing venation almost identical with that of 

 aterriinits. 



Length, 2.5 mm. 



Type locality. Grand Tower, III, April 21, 1914, on bank of Mis- 

 sissippi River (C. A. Hart and J. R. Malloch). 



Orthoci^adius Van der Wulp, sens. lat. 



This genus as defined by Van der Wulp contained a very large 

 number of species which were very closely allied. Subsecjuent work- 

 ers on the family have discovered many minute characters that were 

 either overlooked or ignored by the older authors, and many of these 

 have been used as a basis for the division of the old genus OrtJioda- 

 diiis into subgenera. Kieffer, who is responsible for the subdivisions 



