MAY FLIES AND MI DUES OF NEW YORK 05 



aa Spurs 0, 2, 4 (ocelli absent; wings scarcely acuminate; bead 



with elevated lobes posteriorly) Hydroptila 



11 a a Spurs 1, 2, 4 (ocelli present, wings acuminate, but scarcely 



acute) Stactobia 



aaaa Spurs 0, 2, 3 (ocelli present ; wings acuminate) ..Neotrichia 



ID. ignoring the three species referred to in Hageu's Synopsis, 

 pp. 2745, I have followed a course far from satisfactory to myself, 

 but the only one possible in the circumstances. Whether these 

 species can now be satisfactorily elucidated depends altogether 

 on the condition of the types. 



Mr. McLachlan informs me that the C y 1 1 e n e in i n u t i s - 

 s i m e 1 1 a of Chambers proved to be lepidopterous. 



Unless otherwise stated the locality is Ithaca, N. Y. 



HYDROPTILA 



The genus Hydroptila, as at present constituted, con- 

 tains many European species, and it is highly probable that the 

 North American forms.will prove to be more numerous. A glance 

 at the figures of the appendages will however serve to show that 

 the genus is, in respect of these important parts, far from homo- 

 geneous, and it will no doubt sooner or later be split up into 

 two or more genera. The typical form may be taken as that 

 represented by H y d r o p t i 1 a s p a r s a Curt., the nearest 

 American form being H. consimilis. In this group there 

 is a large somewhat campanulate dorsal plate, regarded by 

 McLachlan as the united superior appendages. 



1. Hydroptila consimilis n. sp. 



The <$ appendages as far as they can be described from the 

 available specimens, are as follows: A large dorsal plate, convex 

 above, notched on its outer margin, and the angles of the plate 

 seen from above appear to be acutely produced, viewed from 

 the side they are seen to be rounded. Side pieces of the last 

 segment produced into somewhat curved subacute processes. 

 Inferior appendages nearly parallel, blades slightly outturned at 

 the tip which is pointed and blackened; the inner margin is 

 oblique near the apex; a small wart on the inner margin before 

 the apex ; the outer or upper margin bears a row of short spinous 

 hairs. The penis considerably below the apex has a strong 

 curved acute process. Ventral lamina short. 



