PSOCID.E. PSOCUS. 117 



€p. 3. Psociformis. Margaritaceo-alba, opaca, ahdomine concolore, antennis 

 corpora muUo lovgioribus, alls posticis parvis. (Long. corp. f lin. ; Exp. Alar. 

 4 lin.) 



N. G. (1437) Pinicola. Steph. Catal. ii. 367. No. 9974 — Co. Psociformis. 

 Curtis, V. xi. pi. 528. 



"Dead pearly white ; antennae twice as long as the body, composed of nearly 

 40 joints, subochreous; superior (anterior) wings very ample, and distinctly 

 iridescent; inferior (posterior) small." — Curtis, I. c. 



Taken amongst firs, in June, at Ripley ; found also in Norfolk 

 and in Scotland. 



Genus XXII.— PSOCUS, Latreille. 



Antennae rather long and slightly pilose, setaceous, consistmg of about 10 

 cylindric articulations, the two basal ones short and thick, the remainder 

 elongate and indistinctly seen : labrum transverse-quadrate, rounded 

 laterally and in front: maxillary palpi porrect, 4-articuIate, the terminal 

 joint largest, ovate-cylindric : labial minute : head large, trigonate-ovate ; 

 forehead very convex : eyes semiglobose, prominent, distinct : ocelli three : 

 collar minute : thorax ample, with impressed lines : wings deflexed, hyaline, 

 nervose ; anterior rather largest, elongate-subovate, with a distinct stigma 

 towards the apex; posterior smaller and less nervose: abdomen short, 

 sessile, ovate-conic : legs rather long : tarsi with two short joints. Larva 

 resembling the imago, but apterous : pupa with rudiments of wings. 



The Psoci are known by having the antennae long, and composed 

 of few elongate indistinct articulations, and slightly pilose in the 

 males : the clypeus is very prominent ; the body soft ; wings four, 

 hyaline, and not covered with powder; the tarsi biarticulate, &c. 

 The species are very numerous, and I think it probable there are 

 many more than are herein indicated, as I have scarcely captured 

 a single example since the publication of my Catalogue, now seven 

 years ago : they differ slightly in the neuration of the wings, and 

 may be divided into sections in accordance therewith. 



A. Anterior wings with a somewhat quadrate transverse discoidal areolet. 



a. First nervure of anterior wings deeply bifurcate. 



1. I?7wg-* variegated ; nervures rather indistinct. 



• Antennae very pilose, 



6p. 1. pilicornis. Niger, alis anticis maculis nebulisque nigricantibus, antennis 



longe pilosis. (Long. corp. I lin. ; Exp. Alar. 3§ — 4 lin.) 



Ps. pilicornis. Latreille. — Steph. Catal. ii. 416. No. 3489. 



