10 [June, 



singular, because the posterior areole is altogether wanting ; pterostigma 

 bordered by an elongated curve. Anterior wings ash-coloured, with 

 some large round browu spots in the areoles, bordered with white, 

 which causes them to appear pupillated. 



Madeu'a, England, Prussia. 



The colour of the wings, and the absence of the posterior areole, 

 render this species easily recognizable. 



No. 8. 



P. ADUSTUS. 



Fusco-piceus, occijnte lineis incurvis,fronte rectis, albidis ; pedihus testa- 

 ceis; tarsis et tibiarum apicefuscis; alispallide cinereis,anticispterostigmate 

 angusto, ovali,fusco, utrinque ohlique Jlavido marginato. 



Long, cum alls 5 mill. ; exp. alar. 10 mill. 



Eather smaller than P. ajjinis of Eambnr. The male with the eyes 

 rather large, the facets almost tuberculose. Colour very dark, of a 

 brownish black ; on the occiput there are indistinct orbicular whitish 

 lines, and on the forehead there are eight straight lines (and some others 

 rudimentary) of the same colour. Antennas 6 millimetres in length, 

 hairy and blackish. Thorax pitchy, with a pale band in the middle 

 beneath, the sutures yellowish. Legs dull yellowish, the tarsi and the 

 tips of the tibise becoming brownish. "Wings pale ash-colour, the veins 

 black, the radius brown ; pterostigma narrow, elongated, bordered by a 

 much flattened curve, blackish -brown, terminated on each side by a 

 yellowish line. Neuration as in the group of P. lineatus, excepting 

 that the pterostigma does not form a triangle, but an elongated oval, a 

 structure which is seen in some succinic Fsoci. 



The female resembles the male, but the eyes are smaller, with the 

 facets not prominent, the forehead larger, the antennae less pilose. One 

 specimen (No. 11) appears to be immature, the whitish colouring of 

 the head predominating over the dark. On the middle of the occiput, 

 near the eyes, and round the ocelli, there are some interrupted 

 blackish lines, formed by elongated points. The markings of the wings 

 form ill-described circles in the middle, with a larger ash-coloured spot. 

 It seems to me that the forehead is still larger in No. 11 than in No. 12, 

 but' otherwise both are so similar, that I cannot discover any specific 

 diflFerences. 



Madeira. 



P. adustus belongs to the group of P. lineatus, but it differs by its 

 pterostigma and by its colours from all living Psoci, and resembles the 

 fossil P. ciliatus. 



Nos. 10 c? ; 11 & 12 ? . 



