138 NORTH AMERICAN ORMOSIA (DIPTERA) 



Abdomen yellowish-fuscous, lateral margin dark fuscous. Hypopygium 

 ferruginous, pleurites somewhat tumid, incurved toward each other apically, 

 appendages long, slender. 



9 , Length, 4 mm.; wing, 5 mm. 



Scarcely differing from male in appearance. Antennae apparently not 

 shorter than in the male. Abdomen entirely blackish, hence the fuscous lat- 

 eral margin of the male not present. Ovipositor sordid yellowish, the upper 

 valves very slender, diverging and a little shorter than the lower valves. 



Holotype: cf; Hazleton, Pennsylvania. August 25, 1914. 



Allotype: 9 ; topotypic. August 31, 1914. 



Paratypes: two males, topotypic. August 25, and Septem- 

 ber 3, 1913. 



An aberrant form. The great cross vein at the middle of the 

 discal cell does not occur in any other of our North American 

 species known to me. Aside from this character, it is distin- 

 guished from our other species of Ormosia with closed discal cell, 

 unicolorous wings with veins six and seven divergent, by its en- 

 tirely brown antennae and the reddish-brown, shining thorax. 

 Four specimens in author's collection. 



Ormosia luteola sp. n. (PI. X, fig. 4.) 



Thorax yellow. Antennae yellowish, infuscate towards the apex. Discal 

 cell closed; veins six and seven diverging to the wing margin. 



d", Length, 3.45 mm.; wing 3.5 mm. 



Head and palpi blackish. Antennae slender, yellowish, outer joints of 

 flagellum infuscate, reaching a trifle beyond the insertion of the wings, flagellar 

 joints densely pubescent, each with one or more setaceous hairs. Eyes large, 

 narrowly separated above. 



Thorax yellow above; mesonotum dull, no stripes, a few long, scattered 

 hairs posteriorly and on the scutellum; metanotum yellowish-brown. Pleura 

 yellowish-brown with a faint, whitish bloom. Halteres pale yellow. Legs 

 yellowish-fuscous, knees yellow. Wings broad, grayish, stigma fuscous, pubes- 

 cence dense and long; discal cell closed, posterior cross vein before the discal 

 cell, veins six and seven diverging to wing margin. 



Abdomen brown, darker posteriorly, covered with a pale rather long, dense 

 pile. Hypopygium concolorous, lobes short, appendages long claw-like. 



9 , Length, 5 mm.; wing, 6 mm. 



Antennae shorter. Pubescence of wing shorter and less dense. Legs fus- 

 cous, femora paler towards the base. Abdomen fuscous, the hairy vestiture 

 shorter and sparser. Ovipositor ferruginous, upper valves strongly curved 

 lower valves much shorter, straight. Wings inclined to fuscous and some- 

 what iridescent. 



Holotype: cf; East River, Connecticut. August, 1911. (Chas. 

 Ely — collector.) 



