PSOCUS. 9 



2. P. lugens ! 



Psocus lugens Hagen ! 



Fuscous, varied with white ; nasus fuscous, lineatecl with gray ; 

 front fuscous, occiput striated with whitish ; antennce rather slen- 

 der, brownish, two basal articulations thicker, apex pale, setce 

 with the apical articulations whitish; thorax fuscous, margined 

 with white ; femora fuscous, annulated with pale before the apex; 

 tibia? and tarsi paler, at the apex fuscous ; anterior wings opaque, 

 fuscous, densely varied with gray, margin and veins marked with 

 white points ; pterostigma triangular ; posterior wings a little 

 smoky, costal margin at the apex interruptedly white and fuscous. 



Length to tip of wings 4^ millim. Expanse of anterior wings 8 

 millim. 



Hob. Washington (Osten Sacken, 1857). 



* * Discoidal cellule open, absent. 



3. P. signatus ! 



Psocus signatus Hagen ! 



Blackish-fuscous ; eyes globose, distant, prominent ; nasus 

 blackish-fuscous, lineated with gray ; front each side anteriorly 

 with an oblique band, and a whitish yellow point upon the occiput ; 

 thorax margined with yellow; abdomen luteous; feet luteous, 

 tarsi blackish-fuscous ; wings hyaline, veins fuscous, pterostigma 

 narrow, linear, blackish-fuscous, posterior margin at base fuscous; 

 cellule at the posterior margin free, elliptically triangular. 



Length to tip of wings 5 millim. Expanse of anterior wings 9 

 millim. 



Hob. New York. 



It is very much like Psocus immunis Stephens (naso, Kambur), 

 but differs a little in the reticulation of the wings. Is it distinct ? 



4. P. pumilis ! 



Psocus pumilis Hagen ! 



Pale luteous ; nasus brassy-fuscous, obsoletely lineated with 

 gray ; front with a medial, longitudinal, blackish-fuscous stripe, 

 two incurved fuscous lines at the eyes ; thorax marked with fus- 

 cous ; the feet pale luteous ; anterior wings pale grayish hyaline, 

 pterostigma, interrupted basal band and the margin behind the 



