4 bulletin: museum of compakative zoology. 



angulate behind ; discal cell long, four-sided, not much wider at base 

 than at tip; antennae short, pilose. 

 Length 4 mm. 



Psocus petiolatus, sp. nov. 



Type.— M. C. Z. 10,040. Va. : Falls Church, 30 June. N. Banks. 

 Two specimens. 



Yellowish, nasus faintly brown, lineate, palpi pale, antennae black- 

 ish; thorax black above, sutures pale; abdomen brownish; legs 

 yellowish. Wings hyaline, an indistinct band before middle, ending 

 on end of anal vein, stigma dark in the outer two thirds; venation 

 mostly dark, the usual hyaline spaces; stigma rather abruptly angu- 

 late behind; discal cell four-sided, short petiolate from the radius, 

 outer side straight, inner side convex toward base; antennae with 

 only very short hair. 



Length 3.5 mm. 



Closely related to P. hisignatus, differs in shape of discal cell, larger 

 size, less distinct band on wing, absence of dark behind stigma, and 

 paler nasus. 



Psocus BILOBATUS, Sp. nOV. 



Type.— M. C. Z. 10,04L Maine: Ft. Kent, 14 August. C. W. 

 Johnson. One specimen. 



Coloration similar to P. imrns; wings longer than P. purus, the 

 stigma very much more elongate and slightly rounded behind, a 

 little darker than rest of wing, and containing a small, faint, dark 

 cloud, discal cell with a small dark spot over basal angle, the outer side 

 strongly concave outwardly, so that the cell is five-sided; stigmal vein 

 nearly unicolorous, but rather pale; antennae very long-haired as in 

 P. purus; tip of male abdomen very strongly bilobed (Plate 1, fig. 1). 



Length 6 mm. 



Differs from P. purus by longer stigma, unicolorous stigmal vein, 

 spot at base of discal cell, and male genitalia. 



Amphigerontia FORMOSA, sp. nov. 



Type.— M. C. Z. 10,042. Queensland: Kuranda. R. C. L. 

 Perkins. One specimen. 



Dull yellowish; clypeus in the middle and the nasus brownish, 

 last joint of palpi black; antennae with basal joints and the first long 



