British Species of Caddis-flies. 151 
Larva unknown ; inhabits standing waters. 
The long narrow form, the structure of the hind wings, the 
somewhat differently formed palpi, the character of the appen- 
dices, and the general facies of the insect, all prove the necessity 
for placing it in a genus apart. At present only one species is 
known. 
1. Eenomus tenellus, Rambur. 
(Pl. VIII. fig. 4, neuration and maxillary palpus; Pl. XIV. 
fig. 5, app.) 
Philopotamus tenellus, Ramb. Hist. Nat. Névrop. p. 503, 4 
(1842); Ecnomus tenellus, M‘Lach. Ent. Mo. Mag. vol. i. p. 
30; Polycentropus concinnus, Hag. (*) Ent. Ann. 1861, p. 5, 
93. 
Antenne yellow, narrowly annulated with brown. Head thickly 
clothed with greyish-yellow hairs. Palpi yellowish, slightly 
brownish externally. Anterior wings pale-greyish, very thickly 
irrorated with pale-golden spots, most of which are more or less 
confluent ; a rather large dark spot at the pterostigma, and similar 
but smaller spots placed regularly along the costal and apical 
and part of the dorsal margins; fringes grey, mixed with pale 
yellow. Posterior wings pale grey, with long greyish-yellow 
fringes. Legs pale ochreous, the anterior and intermediate tarsi 
annulated with brown; the anterior tibia have also a brown 
apical ring. Abdomen brown, the apical segments and appendices 
yellowish. In the male the upper margin of the last abdominal 
segment is much produced; the app. inf. very long, the tips in- 
curved and furnished internally with small black teeth; below and 
between the app. inf. are two long upcurved appendices which I 
eonsider to be properly the penis-sheaths, though they may be 
called app. intermed. 
Expanse of fore-wings 6—7 lines. 
This has been taken in the Fen district by Mr. Winter, and 
also in Hyde Park in June by Mr. Wormald. It is not contained 
in Stephens’ or Curtis’ Collections. 
Genus Nevrecuipsis, M‘Lachlan. 
Antennz rather stout, shorter than the wings, the basal joint 
scarcely longer or thicker than the others. Head very hairy. 
Ocelli absent. Maxillary palpi with two very short basal joints ; 
third rather long and dilated; fourth shorter than the third and 
also dilated; fifth about as long as the two preceding joints united. 
