188 CHARACTERS OF SOME UNDESCRIBED 



1. Bicolor. Curt. 



Piceous, shining, pubescent : mouth and thorax orange-ochre : post- 

 scutellum rugose, stigma ochreous, nervures pale brown : base 

 of abdomen subcastaneous, the back, excepting at the apex, finely- 

 sculptured in vermiculated striae : oviduct ferruginous : legs pale 

 ochreous, tips of posterior tibiae and tarsi fuscous. (Length 3 

 lines, ovipositor 4^ lines.) 



Gen. 548. — Plancus. Curt. 



Antenna? filiform : not so long as the body, composed of 13 joints, 

 basal joint rathe: the stoutest, and chalice-shaped, 2d globose, 

 3d long, the remainder decreasing in length : palpi minute : head 

 transverse : eyes large : ocelli 3, very large : thorax small and 

 globose : abdomen long and clavate : ovipositor shorter than the 

 groove that receives it : superior wrings, with a long narrow stigma 

 placed in the marginal cell, which is of the same form : sub-mar- 

 ginal cell 1, arising at the angle of the marginal one, and extend- 

 ing to the posterior margin ; discoidal cells 2, the superior one 

 reaching the stigma : inferior wings, with 2 longitudinal and a 

 transverse nervure : posterior legs rather long : coxae and thighs 

 slender : tibiae rather clavate, tarsi thicker than the thighs, the 

 basal joint longest, very long in the 1st and 2d pair. 



1. Apicalis. Curt. 



Ochreous, shining : antennae, excepting the 2 basal joints, and head 

 excepting the mouth, blackish : back of thorax and apex of 

 abdomen black, the base and middle of the latter fuscous : stigma 

 and nervures brown : legs pale ochre, posterior pair testaceous. 

 (Length 1 \ line.) 

 Of this remarkable insect, I have seen only the female in 



my cabinet, which I believe I took in the neighboiu'hood of 



London. 



Order. — Trichoptera. 

 Gen. 757.— Silo. Curt. 



Palpi pubescent only, maxillary the longest, the 3 terminal joints of 

 equal length : antennae not longer than the wings, inserted in 

 front of the head, setaceous : basal joints porrected and parallel, 

 long, stout, cylindric, and hairy, the remainder very short : head 

 small, transverse, very hairy on the crown : eyes lateral and pro- 

 minent, abdomen short : wings nearly twice as long as the body, 

 rather obtuse-lanceolate : superior, with 2 costal nervures, and 

 below them 3 furcate ones, and 3 others united near the disk, 



