648. 

 PSOCUS FENESTRx\TUS. 



Order Neuroptera. Fam. Psocidse. 



Type of the Genus, Psocus lineatus Lat. 

 Psocus Lat., Fab., Coq.,Panz., Curt. — HemerobiusffH^^TermesLmw, 

 Antennce inserted on each side the clypeus before the eyes, ge- 

 nerally as long as the wings, subsetaceous, pilose and 13-jointed, 

 basal joint stout, 2nd short, 3rd very long and slender, the fol- 

 lowing decreasing in length (1, a few basal and apical joints). 

 Lahrvm large, pocket- shaped, the anterior margin convex (2). 

 Mandibles tYi^on?i.te, very broad at the base, the apex very acute 

 with a notch beneath, one having a sharp tooth near the base (3). 

 MaxillcE elongated, with a long narrow horny process notched 

 at the apex (4 *), arising at the base and reaching nearly to the 

 extremity of the terminal lobe, which is fleshy at the apex. 

 Palpi long hairy and 4-jointed, basal joint oblong, 2nd longer 

 and stouter, 3rd shorter, 4th as long as the 2nd and ovate (4). 

 Mentum and Labium subquadrate, a little broadest at the base, 

 a deep suture dovsTi the centre, anterior margin sinuated, the 

 angles notched, with a rounded and cihated membrane behind. 

 Palpi none (5). 

 Head lar-ge, ovate-trigonate : eyes remote, lateral, small, globose and 

 prominent : ocelli 3 in triangle on the crown (H the face). Thorax 

 suborbicular . Abdomen short, soft, often ovate : o\dduct inclosed 

 between 2 valves. Wings deflexed in repose, superior much longer 

 than the animal, very ample, with a trigonate stigma, one furcate 

 nervure and 3 distinct cells at the posterior margin (9) : inferior 

 smaller ivith one large and one small furcate nervure. Legs slender ; 

 thighs slightly thickened : tibiae slender, hinder the longest : tarsi 

 short, biarticulate, basal joint a little the longest, especially in the 

 hinder pair : claws curved and acute (8, afore leg). 

 Larvse apterous. Vwpdd ivith rudimentary wings. 



Fenestratus Curt. Guide, Gen. 742. 1. 



In the Cabinets of Mr. Dale and the Author. 



The genus Psocus bears considerable resemblance to the 

 Aphides, but the mandibulate mouth and the neuration of the 

 wings at once distinguish it, and as the disposition of the ner- 

 vures is sufficient to characterize two groups, I shall propose 

 the name of Ccccilius for the second. 



The Psoci are found upon the bark of trees, paling, walls, 

 and under stones, and in all probability they and their larvae 

 teed upon the minute animals that live amongst the Lichen 

 and Mosses that grow in such situations. 



