168 MANDIBULATA. TKICHOPTERA. 



Genus XI.— PLECTROCNEMIA* mihi. 



Antenna rather slender, about as long as the wings, slightly pubescent, the 

 basal joint largest, but not conspicuously robust : maxillary palpi rather 

 slender, with the terminal joint considerably longer than the others united : 

 head broadish, clothed with long hairs on the crown : ei/es ratlier prominent : 

 thorax, stoutish : wings much deflexed during repose ; anterior elongate- 

 elliptic, with all the nervures bifurcate on the hinder margin, and the sub- 

 costal one united to the costal by a transverse nervure at the base of the 

 stigma, forming one long discoidal areolet; posterior wings ovate-triangular, 

 with about five bifurcate nervures on the central portion of the hinder 

 margin : abdomen shortish, terminated by two lateral, angulated, horny 

 appendages in the males : legs rather slender, anterior shortest and stoutest, 

 their tibise armed with a pair of longish spurs at the apex, and a single one 

 in the middle of the inner edge ; intermediate tibiae with a pair of long 

 slender ones at the apex, and a second pair below the middle ; hinder ones 

 with a pair at the apex, and another pair above the middle. 



From the two following genera this may be known by the anterior 

 tibise being furnished with a strong spur in the middle, in addition 

 to the pair at the apex, as in Cyrnus and Polycentropus, but from 

 those genera the different neuration of the wings, as well as the 

 general habit, remove it : the antennae are longer than in the last 

 genus, and rather stouter. 



Sp. 1. senex. Fuscescente-brunnea, Jronte thoraceque pilis argenteo-albidis 

 vesiitis, antennis Julvis albo annulatis, alis anticis canescentibus, alhido nigroque 

 variegatis costd nigro-punctatd. (Long. corp. 5 — 6 lin.; Alar. 12 — 13 I'm.) 



N. G. (554). nigripunctatus. Steph. Caial. 317. JVo. 3591. — Phil, conspersus. 

 Phil. Mag. {Curtis) v. iv. p. 213 .?— Hyd. senex. Pictet, 219. pf. xix./. 1. 



Head and thorax pale fuscoUs, the former with a band of silvery-white hairs 

 round the eyes, and a tuft of the same on the forehead, and the latter with 

 white hairs above; the under side, palpi, and legs, are pale tawny; antennae 

 tawny, with white rings ; anterior wings ashy, or hoary, with numerous 

 irregular whitish blotches and black spots, placed somewhat regularly on the 

 margins, but irregularly on the disc, and the hinder margin with some 

 indistinct yellowish and dusky spots, and near the base, towards the inner 

 margin, is a tuft of brown hairs; posterior wings pale ashy, and imma- 

 culate. 



HXijKrpoQ calcar, Kprj/irj tibia. 



