December, 1899. 1 



277 



ECTOPSOCUS BRIQQSI, A NEW GENUS AND SPECIES OF PSOCID.E 

 FOUND IN ENGLAND. 



BY ROBERT McLACHLAN, F.R.S., &c. 



ECTOPSOCUS, n.g. 

 General characters as in Peripsocus, Hag. : differs especially in 

 the costal and dorsal margins of the anterior wings being subparallel, 

 hence scarcely dilated in the apical portion ; in the pterostigma in 

 these wings being long-oblong (or enclosed in a nearly regular 

 parallelogram), hardly dilated at the end ; and the inner radial branch 

 and the inner cubital branch (Renter's nomenclature*) are confluent 

 (or nearly so) at a point ; in the posterior wings there is still more 

 difference, because the radial sector and the cubitus are widely distant, 

 connected by a transverse nervule. 



EcTOPSOcus Briqqsi, n. sp. 



Above dingy yellowish, beneath and legs paler, almost whitish. Eyes blackish. 



Antennae not longer than the wings, the 

 thread somewhat fuliginous and strongly 

 pilose, 3rd joint very long, 1st and 2nd 

 joints pale, but the 2nd darker above. 

 Kead with some brownish marks behind 

 the ocelli. Abdomen above (in life) with 

 ^'5 the segments margined with brownish, and 

 with a brownish median longitudinal line, 

 pygidiura wholly pale. Wings hyaline; 

 the membrane colourless : in the anterior 

 pair the pterostigma is slightly opaque and 

 finely granulose ; at the termination of 

 each nervure on the margins is an elongate, 

 triangular, blackish or fuliginous, spot, a smaller discal 

 spot of the same colour at the point where the radial and 

 cubital branches meet; neuration and margins hairless, the 

 nervures mostly dusky (pale in certain lights), but distinctly 

 blackish at their ends, and the pterostigmatic nervure is also 

 blackish at each end, together with the strong " hook " or 

 " tooth " on the under-side of the inner nervule : posterior wings without distinct 

 marginal spots. Expanse, circ. 5 mm. 



Hah. : Lynmoutli, North Devon, during the month of October, 

 1899 (C. A. JBriggs). Mr. Briggs took fourteen exaaiples, chiefly 

 amongst dead leaves on the ground, but occasionally beaten from 



* I have adopted Renter's nomenclature as being the best yet proposed, although to a novice 

 it would be somewhat difficult to comprehend without a colour scheme. According to the more 

 simple, but manifestly morphologically erroneous, system u.sed in my Monograph of 1867, it 

 would be sufBcient to say that the " forked vein " is practically sessile in Ectopsocus, and petio- 

 lated in Peripsocus. 



C C 



