331 



Psocus nubilus Harr. MSS. [P. lugens Hag.] 



Variegated with black and white; upper Avings opaque, clouded with 

 black on a whitish ground, the margin and nervures spotted with white ; 

 abdomen beneath whitish, sericeous, with a terminal, reniform, black spot. 

 Length to tip of closed wings .17 in. Cambridge, on fence, Sept. 8, 1837, 



Head fuscous, or blackish, orbits variegated with cinereous; front obso- 

 letely lineated; articulations of the palpi whitish, antennas shorter than the 

 wino-s, the articulations annulated with white. Thorax black, the margins 



O * 



and incisurcs whitish. Upper wings opaque, confluently clouded and spotted 

 with black on a whitish or pale cinereous ground, the margin and principal 

 nervures spotted with white. Lower wings diaphanous, external margin 

 near the tip with minute cinereous spots. Abdomen above greenish white, 

 fuscous at tip, and with three fuscous vittas; beneath whitish, sericeous, 

 with a large, reniforni, black spot near the vent. Legs fuscous, or blackish, 

 the thighs near the tip and first tarsal joint cinereous. 



In some specimens there is an oblong greenish white spot on the external 

 subniargin near the circumscribing nervure of the carpus. 



Psocus quadrifasciatus Harr. MSS. 



Pale brown, or fuscous brown; spot on the vertex, and two spots on the 

 thorax, deep brown; wings diaphanous, superior ones with four pale fuscous 

 fascia;, a darker, central, orbicular spot, and a blackish point on the middle 

 of the external and of the internal margin; antenna short, simple. Length 

 to tip of the closed wings .13 in. Numerous on a fence south of the college 

 yard, Sept. !), 1837. 



Body either light yellowish brown, or darker fuscous brown; a rounded 

 spot on the vertex, including the ocelli, and two spots on the disk of the 

 mesothorax, darker brown; lip and mouth fuscous; antenna? shorter than the 

 wings, fuscous. Wings semitransparent, superior one with four pale, fus- 

 cous, transverse bands, one at the base, one at the tip, and two intermediate 

 ones; a rounded, darker spot in the central areole, and two minute blackish 

 spots on the margins of the wings, one near the middle of the external edge, 

 and the other opposite to it, a little nearer the base on the inner margin ; 

 abdomen with the apex and a dorsal series of dots, and with the incisures at 

 the sides, and beneath, fuscous brown or blackish. Legs pale, tibiae above 

 and tarsi darker. 



The three blackish spots and four bands on the upper wings serve to dis- 

 tinguish this minute species from all others. 



PSOCUS pusillus Harr. MSS. 



Yellowish; antennae, clypeus, vertex and disk of the thorax, nervures of 



