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long as the others together. The parapsidal sutures of the mesoscu- 
tellum are plain; the mesoscutellum and the mesoscutum are large, the 
abdomen is as long as the head and thorax, and the ovipositor extrudes 
about one-third the length of the abdomen; the middle tibia with a 
long spur, the front femora of the male strongly thickened. The wings 
are longer than the abdomen, and narrow. The marginal vein is as 
long as the submarginal and reaches the middle of the wings. The 
stigmal is short; the hind-wings only have long apical cilia. 
PERISSOPTERUS new genus. 
Type: Aphelinus pulchellus How.—Ann. Rept. Dept. Agr., 1880, p. 356. 
Antenne apparently 6-jointed, inserted below middle of face; scape 
not long, swollen toward tip; pedicel one-third length of scape; funicle 
joints 1 and 2 very small, almost like ring joints; funicle joint3 as long 
as pedicel, broadening toward tip and forming with club a broad-ovate 
mass; club undivided, about twice as long as funicle joint 3. Face 
Fia. 5.—Wings of Perissopterus: a, pulchellus; b, mexicanus—greatly enlarged (original). 
excavated, vertex wide, ocelli at angles of nearly right-angled triangle. 
Mesoscutar parapsides narrow, very oblique; mesoscutellum broad, 
rounded at tip; mesopostscutellum and metascutum plainly divided 
transversely into three sclerites, the central one of each triangular, its 
rather sharp point directed posteriorly. Forewings with a narrow, 
oblique, hairless streak, and ornamented with an irregular pattern of 
rather broad, dark lines, composed of stout black cilia with granular 
dark dots between; the cells and spaces between these dark lines sil- 
very white and bearing smaller and more delicate white discal cilia; 
submarginal and marginal veins subequal in length; stigmal given off 
at about half the wing length, very short and stout; marginal cilia mod- 
erate. Hind wings rather broad, rounded at tip, hyaline. Abdomen 
very concave above in dry specimens, perfectly sessile, rounded at tip; 
ovipositor extruded for about one-fifth length of abdomen. 
This remarkable and handsome genus approaches Aphelinus in the 
structure of its antenne and Centrodora in its extruded ovipositor. 
Its middle tibial spur is stronger than is common among the Apheli- 
