NATHAN BANKS. 243 



four or five subcostal cross-veins before origin of tbe radial sector, the latter 

 forked near anastomosis and twice beyond. The eighth ventral segment of the 

 female is scarcely produced, but distinctly acutely emarginate in the middle, the 

 ninth is darker colored, with a median ridge from near the middle of which, on 

 each side, a ridge curves outward and to the hind margin, inclosing a semicircu- 

 lar space; on each side of this segment is a large prominent pale spot; the tenth 

 segment has an impressed spot each side at base. 

 Length with wings 32 mm. 



Yakima, Washington (C. V. Piper). The pale spot on each side 

 of the ventral surface of the penultimate segment separates this 

 species from any others in our fauna. 



IVrhi americana n. sp. 



Head broader than prothorax, bright yellow, with a dull black trilobed spot- 

 covering tbe ocelli, and some black in front, basal joint of antenna? black above, 

 second entirely yellow, rest yellowish below at base, brownish elsewhere. Pro- 

 thorax once and one-half broader thau long, broadest in front, sides straight, 

 angles acute, a median smooth space, each side rugulose, entirely black ; legs 

 yellow, above with black stripe and below on the femora. Meso- and metathorax 

 black. Abdomen dull yellowish above: venter more clear, with a few black 

 marks near tip; setse entirely black; ruentum and sternum black, coxse clear 

 yellow. Roots of the wings and costal margins yellowish, rest nearly hyaline, 

 veins black, the radial sector normally forked but once beyond the anastomosis 

 and once at anastomosis. Ventral lobe of female produced in middle, narrow 

 and rounded at tip. 



Length £> 25 mm. 



Falls Church, Va., June ; Michigan, June. 



Differs from P. tristis by larger size, pale costa of wings, more 

 produced and narrower ventral lobe of the female. 



Dictyopteryx irregularis n. sp. 



Head pale reddish yellow, with a blackish stripe each side, passing through 

 lateral ocelli, a black spot connects lateral ocelli to the mediau one and passes 

 forward each side of clypeus. Antennae yellowish brown. Prothorax yellow- 

 brown, the elevations blackish. Legs pale, black on femora just before tip and 

 on bases of tibiie. Abdomen brown ; se tie brownish ; wings smoky. Head hardly 

 as broad as prothorax, latter rather longer than in D. signata, sides straight, an- 

 gles acute, somewhat rugose on the sides, smooth in middle. Wings with many 

 cross-veins, very irregular, a few project from radial sector into the cell, and 

 sometimes connect to radius, none, however, in the posterior apical space, very 

 few in the basal costal space, sometimes free till near middle, radial sector arising 

 well toward base; setse reach beyond end of wings, joints slender ; ventral plate 

 of female longer than broad, rounded at tip, and narrowly but deeply emarginate 



Length with wings 30 mm. 



Mt. Ranier, Washington (C. V. Piper). 



Readily separated from D. sigimfn by larger size, markings of 

 head and thorax, irregular venation and shape of ventral plate of 

 the female. 



TRANS. AM. ENT. SOC. XXVI. MAY, 1900. 



