90 ACANTHOPSYCHR RITSEMAE. 



This very beautiful species is easily distinguished from 

 Oiketicus Hühneri Westw. and Herrichii Westw. which also 

 have hyaline wings l)jt belong to another genus and do 

 not possess the large spine of the anterior tibiae. I found 

 it among some species of Psyehidae of the Leyden 

 Museum. 



The head is ^/g as broad as the upperside of the tho- 

 rax. The eyes are very prominent. The front is covered 

 with yellowish , the occiput with fulvous hairs. The clypeus 

 is very distinct, and in the middle of the face two small 

 tubercles are to be found. The mouth is covered by the 

 short but large yellowish pseudopalps. The fulvous an- 

 tennae , which are bipectinated up to the tip , consist of 

 nearly thirty joints , the long pectinations gradually shor- 

 tening towards the tip. 



The thorax is I'/g as long as broad; its foreside and 

 the scapulae are greyish , the rest is fulvous ; the under- 

 side is covered with orange-yellow hairs. 



The abdomen is dark fulvous ; the five last segments are 

 blackish and show white rings. The underside is of the 

 same colour as the thorax. 



The legs are densely covered with long yellowish hairs, 

 the tarsi are naked. The fore legs are long and thick, 

 their tibiae are provided with a very strong spine ; the 

 hind ones have very long and slender tarsi , the terminal 

 spurs of the hinder tibiae are short. 



The fore wings are elongated, very narrow at the base. 

 The front margin is twice as long as the hinder one. The 

 external margin is ^'^ shorter than the former. The apex 

 is acute. They are altogether destitute of scales, except 

 the costa, the basal parts of cell 11 and 10, of the dis- 

 coidal cell, of cell \a and \h , and a broad stripe along 

 the hinder margin. On the hyaline parts dispersed hairs 

 are to be found. The veins are also brown-fulvous. 



The hiud wings are small with the front margin nearly 

 straight like the hinder one; the external one is dilated 

 in the middle into a rounded lobe, and consequently has 



.Notes from tlae Leyden IVIuseum , "Vol. III. 



