W. G. DIETZ 139 



Allotype: 9 ; Hazleton, Pennsylvania. July 7, 1913. 



Paratype: 3 females. June 11, 1913, July 25, 1914. 



Easily distinguished from the other species of Ormosia with 

 unicolorous wings, closed discal cell and veins six and seven 

 diverging towards the wing margin, by the yellow color of the 

 thorax and the pale yellow antennae but slightly inf uscate towards 

 the apex. The difference in size between the male type and the 

 females, may possibly be due to difference in environment of the 

 respective localities. All in author's collection. 



Ormosia pilosa sp. n. (PI. X, fig. 5.) 



\^'ings unicolorous. Discal cell closed. Veins six and seven diverging to 

 wing margin. Antennal flagellum pale, infuscate towards the tip. Body and 

 wings conspicuously pubescent. 



cf, Length, 3.5 mm. (abdomen contracted); wing, 4.5 mm. 



Head and rostrum blackish. Palpi brown, stout. Eyes large, black. An- 

 tennae rather long, reaching a trifle beyond the insertion of the wings, basal 

 two joints of moderate length and thickness, brownish-red and shining; flagel- 

 lum pale, densely clothed with rather long pale pubescence, each joint with a 

 few long bristles, outer joints elongate, attenuated at each end. 



Thorax dull reddish above, tinged with brown; mesonotum with an ill-de- 

 fined, median fuscous vitta which does not attain the anterior margin nor the 

 transverse suture, a small fuscous dot each side anteriorly; a row of fine pale 

 hairs each side, converging towards the middle posteriorly. Metathorax 

 reddish fuscous. Pleura fuscous. Halteres pale yellow, club somewhat infus- 

 cate, tip pale. Legs long and slender; coxae and legs yellowish-fuscous, apices 

 of femora and tibiae pale. Wings of moderate width, hyahne, pubescence short, 

 and dense, giving the wing a grayish tinge, stigma concolorous; discal cell 

 closed; the large cross vein before the discal cell. Vein seven diverges from 

 vein six to wing margin. 



Abdomen fuscous, clothed with rather long, coarse pale hair. Hypopygium 

 small, fuscous; pleural lobes convex externally, upper appendages slender, 

 strongly incurved, claw-hke, the lower short. 



9, Length, 4.5 mm.; wing, 5 mm. 



Differs from the male as follows: Antennae shorter and less slender, bent 

 back they reach midway between the anterior thoracic margin and the root of 

 the wing; flagellum pale fuscous, pubescence shorter and less conspicuous. 

 The mesonotal vitta reaches the anterior margin. Wings somewhat iridescent. 

 Pubescence of abdomen shorter, not so coarse and less conspicuous. Ovi- 

 positor reddish, upper valves strongly curved, lower approximately straight. 



It is with some hesitation that I place this as the female of the above de- 

 scribed male. It agrees in general habitus and coloration, especially of the 

 thorax, but differs in the iridescence of the wing and the less pronounced pilos- 

 ity of the abdomen. Both specimens were taken at the same locality, though 

 on different dates. 



TRANS. AM. KNT. SOC, XLII. 



