Sept., 1907.] Banks: New Trichoptera and Psocid.e. 165 



Psocus oppositus, new species. 



Head pale, a black mark across base of nasus, and one over the ocelli ; antennae 

 rather long, pilose, third joint as long as width of head ; eyes not very large, but 

 prominent, not as high as vertex, which is straight across on top ; mesothorax with 

 the usual pale Y-mark, leaving three large black spots ; abdomen brown ; legs pale 

 yellowish. Wings hyaline, a brown mark at end of anal vein, and from thence a 

 faint brownish cloud obliquely across the wing ; pterostigma long, and rounded 

 behind, mostly covered with a large brown spot, and opposite to it on the first pos- 

 terior vein is a transverse brown spot of about equal size ; base of pterostigma white, 

 and before this a black dot ; venation mostly brown, but the vein closing cell, and 

 the fork of radial sector are white ; cell not pedicellate, about one fourth narrower 

 below, its upper and outer sides subequal ; second posterior cell very narrow above. 

 Length 4 mm. 



Falls Church, Va., September. Readily known by position of 

 spots on wings. 



Psocus medialis, new species. 



Head pale, nasus hairy, a dark mark across its base, near base of antennas, a 

 prominent black spot over ocelli and extending up over middle of the vertex ; antennae 

 pale, paler on base, with many long hairs, third joint less than width of head ; eyes 

 large and as high as vertex, which is straight across. Thorax shining black, with the 

 usual pale Y-mark ; abdomen (dry) black ; legs pale, knees and tarsi blackish. Wings 

 hyaline, a black dot at end of anal vein, also at base of pterostigma, latter barely 

 darker than rest of wing, elongate, and rounded behind ; venation brownish, vein clos- 

 ing cell and fork of radial sector white ; cell about one half narrower below, outer 

 side plainly longer than upper ; in one specimen the cell is plainly pedicellate from 

 radial sector. Length 3 mm. 



From Appalachicola, Florida, on oak bark. 



Psocus infumatus, new species. 



Head pale, nasus lineated with brown in the middle, and a few brown dots on the 

 vertex ; antennae brownish, paler on the base, with very few short hairs, third joint as 

 long as width of vertex ; eyes very prominent, but hardly as high as vertex, latter 

 straight across on top. Thorax brown, with the usual pale Y-mark, and a wedge- 

 like pale mark on each lateral lobe ; abdomen (dry) brown. Coxse brown on base, 

 rest paler, femora brownish above, pale below, tibire pale, tipped with brown, and 

 tarsi mostly brown. Wings fumose ; a brown cloud from tip of anal vein up to the 

 median, a black dot at base of the pterostigma, beyond pale, the apical half brown ; 

 veins dark brown, that closing the cell, lower third of outer side of cell, and the fork 

 of radial sector hyaline white ; pterostigma angulate behind, rather long, and outer 

 side strongly oblique ; cell not pedicellate, almost one half narrower below, puter 

 side plainly longer than upper ; first posterior cell shorter on median vein than either 

 the second or third. Length 4.8 mm. 



One specimen from Falls Church, Va. 



Psocus moderatus, new species. 



Head pale, black around the ocelli ; antennae brown, long, very hairy, third 

 joint much longer than width of head ; eyes of moderate size, almost as high as ver- 



