66 NEW YORK STATE MUSEUM 



This species, as has been indicated, is close toH. sparsa, 

 but differs from that species in minor details, and particularly 

 in the process on the penis, this process inH. sparsa being 

 smaller and nearer the tip of the organ. 



Ithaca, N. Y., and Belfrage, Texas. 



2. Hydroptila delineatus n. sp. 



This species has the lobes on the head enormously developed. 

 The antenna are about 31- jointed in the <^. 



The last dorsal segment appears to be deeply excised, the excision 

 being followed by a large semitransparent plate difficult to sep- 

 arate from the basal portion of the appendages, but apparently 

 having a small submarginal 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 outturned and 

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

 angle somewhat 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 appendages, near their middle, is a slightly raised part 

 bearing two or three spinous hairs. Ventral lamina short. 



This species can be determined without difficulty from the 

 ventral aspect of the appendages. It has no very near known 

 ally. 



3. Hydroptila spatulata n. sp. 



The dorsal plate in the J 1 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 

 yery near ally known to me. 



