NATHAN BANKS. 6 



about as long as the posterior side of cell ; pterostigma long, broadly rounded be- 

 hind. Length 4.2 mm. 



Two specimens from Mt. Washington, New Hampsliire (Mrs. Slos- 

 son), and Aurora, West Virginia (Heideman), also one from Brook- 

 line, Massachusetts (Johnson). This may be Psocus bifasciatus of 

 Walsh, but that name is preoccupied in the genus. 



Psocus posticatiis n. sp. — Face pale yellow, clypeus black, nasus pale 

 brown, ocelli on black, vertex brown, with a yellow spot each side; antennae 

 dark brown, basal joint paler; thorax brown, a yellow V in front and a trans- 

 verse spot on niesoscutelluni ; abdomen dark brown, segments marked trans- 

 versely with yellow; legs pale, tarsi brown. Wings dusky hyaline; venation 

 black; pterostigma black, long, rather slender, rounded behind ; the veinlet sep- 

 arating first and second posterior cells is broadly clouded with brown ; and there 

 is a dark spot at end of anal vein. Discai cell four sided, the base almost twice 

 as wide as apex, anterior side rather convex, other sides straight; the radial sec- 

 tor does not fork as soon as in most species; second and third posterior cells are 

 subequal at base, and not near as wide as the first at base. Head rather narrow, 

 vertex straight across on top. Length 3.6 mm. 



One specimen from Guadalajara, Mexico, August (McClendon). 



Psocus niinusculus n. sp.— Head pale dull yellowish, unmarked ; an- 

 teunse yellowish ; thorax and legs yellowish ; abdomen brown. Wings hyaline, 

 venation brown, a black point at base of pterostigma, and one at end of anal 

 vein. Head rather large, nearly straight across on top, slightly emarginate in 

 middle. Pterostigma truncate at base, concave behind, deep and almost pointed 

 at outer angle ; discai cell rather more than twice as long as broad, outer side 

 concave, very plainly five-sided ; the posterior cells subequal in size at base, or 

 the middle one a trifle larger. Length 2.4 mm. 



Four .specimens from Falls Church, Va. 



Perla californica Bks.— Head brown, pale reddish yellow between 

 ocelli and on clypeus; antennae pale brown; prothorax brown, with a trace of 

 a paler median line, rest of thorax dark brown, with a pale median stripe ; abdo- 

 men pale brown; venter pale in middle, brown on sides; femora pale brown, 

 tibiae paler, with a blackish band on base; setae yellowish brown. Wings nearly 

 hyaline, venation pale brownish ; ventral plate of female pale, with a prominent 

 rounded blackish spot each side. Pronotum plainly broader than long, anterior 

 angles acute, posterior ones slightly rounded. Structure similar to P. lycorias. 

 Length 30 mm. 



Claremont, California (Baker). 



Readily separated from allies by two black spots on the ventral 

 plate. 



Perla caroliiiensis Bks.— He^d nearly covered by a large black spot, 

 angulate behind in the middle, and leaving a triangular orange spot each side 

 near base of antennae, basal joint of antennfe mostly black, second joint yellow, 



TBANS, AM. ENT. SOC. XXXII. NOVKMBEK. 1905. 



