6 PROCEEDINGS OF THE NATIONAL MUSEUM vor.. 82, art. 11 



ameter of an ocellus, behind the ocelli, thence sharply declivous to 

 occiput; diameter of an ocellus about one-half ocellocular line; first 

 joint of flagellum slightly longer than second, constricted at base; 

 notauli defined only anteriorly; mesoscutum distinctly convex, 

 though slightly flattened in posterior middle ; scutellum triangular in 

 outline, slightly raised, truncate at base, the basal edge indistinctly, 

 transversely striate; mesopleurum smooth, finely punctate; prop- 

 podeum strongly granular, the pleural and apical carinae distinct, 

 other carinae entirely absent. First abdominal segment rather long, 

 gradually broadening toward apex, the lateral foveae large and near 

 the base, the tergite granularly opaque except at extreme base, where 

 it is polished; second and third tergites much broader than long, 

 depressed. Legs long; in the hind legs the coxae nearly as long 

 as the first abdominal segment, the calcaria as long as the third 

 tarsal joint, the first tarsal joint as long as the three following 

 joints combined. Nervulus interstitial, the discocubitus abruptly 

 curved, giving the second discoidal cell a subquadrangular appear- 

 ance ; postnervulus broken slightly above the middle, areolet oblique, 

 quadrangular; intercubitella about one-half as long as the basal 

 abscissa of radiella, nervellus slightly reclivous, broken below the 

 middle. 



Black; head except middle of frons, vertex, and upper part of 

 occiput flavo-f erruginous ; antennae brownish above, paler beneath; 

 tegulae whitish; abdomen beyond the first segment ferruginous, 

 slightly darker on second segment and apex; mandibles, palpi, 

 front coxae and trochanters stramineous; legs largely reddish tes- 

 taceous with front and middle legs paler ; wings hyaline. 



Male. — Except for secondary sexual characters and the following 

 differences in color, essentially like female : Antennae at base 

 beneath, clypeus, mandibles except at apex, median line on front, 

 cheeks, palpi, and entire orbits whitish; prothorax except collar, 

 tegulae, a small spot on mesonotum above the humeral angle, meso- 

 pleurum below the groove, sternum, and a spot before the hind 

 coxae rufo-flavescent. 



Type locality. — Parr Island, East Spence Lake, Ontario, Canada. 



Type.—V.S.'^.'M. No. 44129. 



Remarks. — Described from five males and two females captured 

 by the writer at the type locality on July 6, 1931, and named for 

 Dr. J. Paul Visscher, of Western Reserve University. The type 

 pair taken in copula. Paratype A, male and female, somewhat 

 darker in color. 



U.S. GOVERNMENT PRINTING OFFICE; 1933 



