lid M:\V YOKK si \ 1-1: MI SKI M 



Tliis species, as has bci'U indit -ated, is close to II. s p a r s a , 

 but dillVrs from that species in minor details, and particularly 

 in (In- process on tin- p<-ms. this process in H . sparsa being 

 smaller and nearer ilie lip of the organ. 



Ithaca. N. V.. and I'.eltra-c. Texas. 



2. Hydroptila delineatus n. sp. 



This species has the lol.es on (lie head enormously developed. 

 The antenna- are about i'.l jointed in the g. 



Tile las! dorsal segment appears to I e deeply excised, the excision 



being followed liy a large semit rans|iarent plate ditticult to sep- 

 arate from ihe basal portion of the appendages, but apparently 

 having a small submariiinal projection on either side of a larger 

 median one, but the outline of the plate is rather uncertain. The 

 inferior appendages are nearly parallel, the apex ouiiiirned and 

 upturned: the apical portion seen from the side has the lower 

 angle someuhat produced while the upper part of the apex forms 

 a kind of knob which in some positions shows a slight angle on 

 its anterior side. Arising from the upper side of these append- 

 ages is a long spirally curved acute process which winds itself 

 round the under side of the apical lobe. On the outer (or lower) 

 edge of the apj emlages. near their middle, is a slightly raised part 

 bearing two or three spinous hairs. Ventral lamina short. 



This species can be determined without dilliculty from the 

 \entral aspect of the appendages. It has no very near known 

 ally. 



3. Hydroptila spatulata n. sp. 



The dorsal plate in the <$ narrower than in consimilis, 

 deeply notched in the posterior margin. Inferior appendages 

 approximated at the base, slightly curved outwards and down- 

 wards, superior edge with a few spines; apex apparently scabrous. 

 Side pieces of the last segment produced into rather long sub- 

 acute processes. The penis, usually much exserted, with a flat- 

 tened rounded apex, immediately below which is a small acute 

 process placed at right angles. Ventral lamina very long and 

 slender, slightly swollen at the apex when viewed from the side, 

 the outer margin obliquely truncate, blackish and roughened. No 

 verv near allv known to me. 



