58 PROCEEDINGS OF THE ACADEMY OF [Part I 



Diotrepha fumicosta sp. n. 



General coloration dark brown, legs pale yellow, wings brown, 

 the costal margin broadly seamed with darker brown, basal deflec- 

 tion of Cui about one-half the length of the sector before the origin 

 of the latter. 



Female. — Length 6.5 mm., wing 5 mm. 



Rostrum and palpi dark brown. Antennae pale brown. Head 

 brown. Mesonotum and pleura dark brown. Mesosternum slightly 

 paler than the pleura. Halteres dark brown, the base of the stem 

 paler. Legs with the coxae dark brown, trochanters obscure yellow; 

 remainder of the legs pale yellow, only the terminal tarsal segments 

 a little darkened. Wings with a strong brownish tinge, the costal 

 region, continued to the Aving-apex, broadly darker brown, this color 

 paler on the basal third of the wing; a brownish cloud in the base 

 of cell 1st A; veins brown. Venation: Sc moderately long, Sci 

 ending opposite midlength of Rs, Sd near the tip of Sci; Rs long, 

 gently arcuated; ?• on -R2+3 and on Ri, the distal section of R^ being 

 a little longer than the strongly arcuated basal deflection of R4 + i', 

 basal deflection of Cui before the level of the origin of Rs, the dis- 

 tance about one-half of Rs. In the paratype, Rs is considerably 

 longer than R2+S. Abdomen dark brown, the stout valves of the 

 ovipositor horn-colored. Tergal valves of the ovipositor much 

 smaller and shorter than the powerful, blade -like sternal valves. 



Habitat. — Brazil, Venezuela. 



Holotype, 9, Prata, Para, Brazil, June 30, 1920 (H. S. Parish). 



Paratopotypes, 2 9 's, one in the collection of the British Museum 

 of Natural History. 



Paratype, 9 , Boqueron, Yaracuy, Venezuela, March 17, 1920 

 (J. H. and E. B. Wilhamson and W. H. Ditzler). 



The only described species with which the present form agrees 

 at all is D. concinna Wilhston. Mr. F. W. Edwards, of the British 

 Museum, has compared a paratype of the present species with 

 Williston's types of D. concinna and reports the differences as follows: 



"D. concinna: Thorax light brown. Wings clear (legs missing). 

 Palpi longer. Wings narrower, especially cell Sc. Crossvein sc 

 (Sc^) beyond the tip of Sc, in one specimen another crossvein in 

 cell Sc beyond the first. Rs half as long again as R2+3, hence all 

 apical cells very short. Cui a (basal deflection of Cui) nearer base 

 of wing, at a distance about equal to R2+3 before base of Rs. 



"D. fumicosta: Thorax darker brown. Wings with broad brown 

 margin on apical part of costa. Palpi shorter. Wings rather 

 broader. Crossvein sc just before tip of Sc. Rs a Httle shorter 

 than Ri + 3, apical cells longer than in above. Distance of Cui a 

 from base of Rs equal to less than half of i?2+3."— F. W. Edwards. 



