144 NORTH AMERICAN ORMOSIA (DIPTERA) 



Holotype: cT; Hazleton, Pennsylvania. April 15, 1914. 



Allotype: 9 ; topotypic. August 25, 1914. 



Paratypes: topotypic. May, June, October. Hamburg, New 

 York. May 26 (Coll. Van Duzee). 



All the material with the exception of the last mentioned, in 

 author's collection. In appearance this species resembles 0. 

 rubella Osten Sacken in the color of the thorax, but the vitta of 

 the latter is less pronounced and broader, veins six and seven 

 diverging towards the wing margin and the hypopygium has a 

 very different construction. From the other species of Ormo- 

 sia with unicolorous wings, the discal cell opening into the third 

 posterior cell and veins six and seven diverging, it differs from 

 0. manicata and modica in the antennae being entirely fuscous 

 and from 0. bilineata in the absence of a dark line on each side of 

 the mesonotum and the different formation of the hypopygium. 



Ormosia divergens sp. n. (PI. X, fig. 10.) 



Reddish-brown, antennae of male long, discal cell coalescing with the third 

 posterior cell, veins six and seven widely diverging, stigma faintly infuscate. 



d\ Length, 3.25 mm.; wing, 4.75 mm. 



Head fuscous, front and occiput with silvery gray bloom. Palpi and an- 

 tennae brown, the latter slender, basal two joints yellowish above, joints of 

 flagellum elongate, the first and second joints slightly, the following strongly 

 attenuated apically; joints one to eight of the antennae — the remainder miss- 

 ing — when bent back reach beyond the metathorax; basal joints of flagellum 

 beset with long hairs — the pubescence of the remaining joints probably 

 abraded. Eyes approximate above. 



Thorax reddish-brown; collare pale yellowish; mesonotum with an ill-de- 

 fined and rather indistinct, darker median stripe, some pale, short scattered 

 hairs, the latter more evident behind the transverse suture and on the metano- 

 tum. Halteres pale, knob infuscate. Legs yellowish-brown, coxae and femora 

 towards the base, paler. Wings rather broad, hyaline with a pale brownish 

 tinge and having a bluish, pearly lustre in certain lights, pubescence sparse, 

 region of stigma slightly infuscate; discal cell coalescing with the third pos- 

 terior cell, posterior cross vein at base of discal cell; veins six and seven widely 

 diverging towards the wing margin, vein seven short and nearly straight. 



Segments one to four of abdomen yellowish-brown, margins darker, re- 

 maining segments brown, hairy vestiture" short and scant. Hypopygium 

 ferruginous, densely covered with a long, yellow pile, pleurites short, tumid, 

 appendages slender and claw-like. 



Holotype: cf; Hazleton, Pennsylvania. July 5, 1910. 

 The type, a mutilated specimen, is in my collection; although 

 but eight joints of one antenna are left, there is no doubt that the 



