186 MANDIBELATA. TIJICHOPTERA. 



combined with the approximation of the insertion of the latter, the 

 4-spurred posterior tibiae, short, divaricating maxillary palpi, and 

 slender labial ones, exclusively of the diversity in the formation of 

 the -wings, which have a distinct somewhat ovate areolet on the disc, 

 towards the apex of the wings, the dark colour of the latter, and the 

 brevity and stoutness of the antennae, serve to discriminate them 

 from the allied genera of this family. 



Sp. 1. atrata. Nigra, alts (^anticis prceseriim) fuscis, immaculatis, tibiis 

 iarsisque obscure testaceis. (Long. corp. 4 lin. ; Exp. Alar. 10 — 13 lin.) 



Phr. atrata. Fabricius. — Not. atrata. Steph. Catal. 319. No. 3626. — Ser. 

 atratum. Piciet, p. 178. pi. xw.f. 5, a — c. 



Black and pilose : antennce brown-black ; anterior wings deep brown, with a 

 coppery tinge, and clothed with a short black pile, immaculate ; posterior 

 wings rather paler ; femora black ; anterior and middle tibise and tarsi 

 obscure testaceous, posterior pale testaceous, or ochreous. 



Not very uncommon : taken in June at Hertford ; also in the 

 New Forest. 



Genus XXI. — SILO, Curtis. 



Antennce shorter than the wings, the basal joint porrected, parallel, long, stout, 

 cylindric, hairy : palpi pubescent, maxillary in the males diverging, slightly 

 pilose, the three terminal joints of equal length ; head small, hairy on the 

 crown; e^/es prominent: ivings nearly twice as long as the body, obtusely 

 lanceolate ; anterior with two costal nervures, then three furcate ones, and 

 three others united near the disc, with a curved one near the hinder angle ; 

 posterior wings small : abdomen short and robust : tibice with a pair of spurs 

 at the apex ; intermediate and posterior with a pair also below the middle. 



This and the following genus are distinguished by having the 

 basal joint of the antennae very much lengthened and robust, the 

 two are parallel with each other and porrected ; the males of the 

 present genus are distinguished from those of the following by having 

 the maxillary palpi divaricating and short; they are also very 

 pubescent, and the females have the same organs rather stout, but 

 slender at the apex ; the neuration of the wings is also somewhat 

 different in the two genera, which are, however, closely allied. 



Sp. 1. pallipes. Nigra, alis nigro-fuscis, immaculatis, pedibus pallide ochracets. 

 (Long. corp. 4 lin.; Exp. Alar. 9 — 11 lin.) 



Phr. pallipes. i^ainc/wi.— Not. pallipes. Sirph. Catal. 319. No. 3625. 



