OF EXTRA-EUROPEAN TRICTIOPTERA. 



133 



IIydropsyche mauritiana, nov. sp. H. testacea. Caput dense 

 aureo-hirsutum : antennae pallide flavo-testaceac, brunneo annulatae : 

 palpi pedesque flavo-testacei. Abdomen fusco-nigrum, utrinque 

 griseo lineatum ; appendices testacea? ; app. inf. elongatis, cylindricis, 

 sursum directis, articulo secundo brevi ; penis brevis, incrassatus, 

 latus, ad apicera angulato-bifidns, infra ante apicera processu elongato, 

 gracili, capitato, bidentato instructus. Alae anticae elongatae, rufo- 

 testaceae, obsolete griseo reticulata? : posticae subhyalinae, sparse 

 breviterque griseo-pubescentes ; venis testaceis ( c? ) • 



Long. corp. 4j lin. ( = 9^ mill.) ; exp. alar. 13^ lin. ( = 28 mill.). 



Hab. Insula Mauritius, mense Julio {in Mus. auct.). 



Testaceous. Head and prothorax densely clothed with pale golden- 

 yellow hairs : antennae pale yellowish testaceous, with brown annula- 

 tions. Palpi and legs yellowish testaceous, a black dot on the inner side 

 of each of the trochanters, and the extreme tip of each tibia externally 

 blackish. Abdomen blackish fuscous, with sparse grey hairs, and with 

 a grey line along each side : appendices testaceous : a broad obtuse 

 lobe is connected to the middle of the last dorsal segment, and from 

 beneath this arises a membranous lobe, which is excised to the base 

 above, the sides being produced into forcipate elongations : app. inf. 

 long, arising from a broad basal piece which is strongly fringed ; cy- 

 lindrical, with long testaceous hairs ; the second joint curved inward 

 and downward and forcipate : penis short, broad, and thick, the glans 

 much dilated and deeply emarginate, the lobes being somewhat an- 

 gular ; from the base of the glans beneath arises a long, slender, cy- 

 lindrical process, which extends beyond the apex, and the tip of which 

 is abruptly rounded, bearing above two straight, slightly divergent 

 teeth. (PI. IV. fig. 17.) 



Anterior wings elongate, reddish testaceous, with obscure grey reticula- 

 tions, which are most evident in the apical portion and near the base ; 

 apical fringe very short, blackish ; veins pale testaceous. Posterior 

 wings subhyaline, faintly tinged with yellowish, and sparsely clothed 

 with short grey pubescence ; veins pale testaceous. 



I possess one <$ indicated as having been taken in the Island of 

 Mauritius in July. It is in bad condition ; but the species is so di- 

 stinct in coloration and in the structure of the penis that I have 

 not hesitated to describe it ; I know no species in which the penis 

 shows any approach to an analogous formation. 



Hydropsyche modica, nov, sp. H. fusca. Caput, prothorax meso- 

 thoraxque supra in medio, griseo-aureo-hirsuta : antennae testaceae, 

 brunneo-annulatae : palpi pedesque flavo-testacei. Abdomen fusco- 

 nigrum : appendices testaceae ; app. inf. articulo secundo gracili, spi- 

 niformi : penis gracilis, ad apicem elongato-capitatus, inermis. Alae 



