150 MANDIBULATA. — TRICHOPTERA. 



metamorphoses are yet unknown ; but, when detected, its location 

 will then become evident : for the present, therefore, having com- 

 pleted the Lepidoptera, I shall temporarily remove it to this side of 

 the line of demarcation, and consider it as referrible to this order, 

 rather than omit all notice of this singular family. 



Genus I.— ACENTROPUS, Curtis. 



Antennw slightly pubescent^ inserted close to the eyes, shorter than the body : 

 labrum elongate : maxillary palpi large, curved, densely clothed with scaly 

 hairs : head somewhat globose : eyes globose, lateral : ocelli two : wings 

 dissimilar, anterior with a long discoidal areolet, with numerous radiating 

 nervures, which extend to the costal and hinder margins ; posterior smaller, 

 with similar nervures, all furnished with scale-like cilia: abdomen attenuated, 

 its apex terminated by a curved hairy lobe and two pilose appendages ; in 

 the female simple and acute. 



The chief peculiarities of this genus have been already pointed out 

 in the observations upon the family : one species only appears to be 

 known, which seems to frequent marshy places. 



Sp. 1. niveus. Pallide rufo-ochraceus, capite thoraceque canescentibus, alls 

 sericeo-niveis, oculis atris. (Long. corp. 2§ — 3 lin. ; Exp. Alar. 6 — 7§ lin.) 



Phr. nivea. Olivier teste Latreille.- — Acentria nivosa. Steph. Catal. 316. No. 

 3562 <^. — Zancle Hansoni. Steph. Nomen. 2d edit. col. 118 ?. — Acentropus 

 Garnonsii. Curtis, v. xl.pl. 497, var. 



Pale reddish-ochre : eyes black ; head and thorax clothed with short white 

 and greyish scales ; tippets whitish ; abdomen ocbreous above, dotted with 

 white scales beneath; wings glossy snow-white. 



The anterior wings have sometimes the costa and hinder margin more or less 

 of a bright tawny-ochreous. 



Brief as Latreille's definition of the Phry. nivea of Olivier is, I believe this to 

 be that insect. Latreille says, "Blanche; ailes ciliees; partie superieure 

 de I'abdomen obscure." — Hist. Nat. Crust. &;c. v. xiii. p. 93. 



Found on willows near the Croydon Canal, by Greenwich, in June; 

 also by Dr. Leach, in Scotland; Mr. Hanson, near Reading, in 



of times, and he has appended to his account the localities which / furnished 

 him with many years since; and Mr. Dale, upon a visit to me of some days, 

 when he had the uncontrolled range of my cabinets during my unavoidable 

 absence from home, must have noticed so remarkable an insect, which 

 remains to this moment in the actual position it occupied in the drawer in 

 1826, the period of his sojourn at my residence. 



