Rev. A. Matthews' Notes an Trichoptery.Ria. I(i7 



found to agree in eveiy other cliaracter. It sometimes, but very 

 rarely, happens that similar sculpture exists in totally dissimilar 

 s]iecies, but in all these cases the size, form, or the length of 

 limits contradicts the possibility of their identity. Among the 

 sjiecies described in the following pages, T. vicina and T. cognata 

 respectively approach the European T. picicornis and 2\ fasci- 

 riilaris, but after the most careful comparison, I feel cnnvinced 

 that they cannot be associated Avith those species. 



Tlie most interesting among the captures of Air. Crotch, ni-e 

 ITydroscapha natans, and Motsrhnlskiuin sinuatocoUe, of tlieso 

 the former is one of those synthetic forms whose true ])Osition it 

 is SO difficult to determine, and the latter a remarkable insect 

 previously known only by a much mutilated and uni(|ue example 

 in tlie collection of Dr. Le Conte. 



List of I'jichojderj/gia found by Mr. Crotch in Americn. 



The species marked W, were found on the Western side, those 

 marked E, on the Eastern side of the Continent. 



Hydi'oscapha natans. Le Conte. W. 

 Nossidium posthumum, Matth. E. 

 Motschulskium sinuatocoUe, Matth. W. 

 Actidium Crotchianum, n. sp. W. 



,, pohtum, n. sp. W. 



Ptiliiim Columbianum, n. sp. W. 



p humile, n. sp. W. 



„ obscurum, n. sp. W. 



Ncjihanes laeviusculus, Matth. E. 



Trichopteryx moerens, Matth. E. allied to T. rarioloaa. 



,, aspera, Hald. E. 



,, parallela, Motsch. W. 



„ vicina, n. sp. W. allied to 



,, castanea, n. sp. W. „ 



,, Cahfornica, n. sp. W. ,. 



„ xanthocera, n. sp. W. ,. 



„ parallelopipeda, n. s]j. W. ,. 



„ diffinis, Motsch. W. 



,, cognata. n. sp. W. ,, 



