REPORT OF THE STATE ENTOMOLOGIST IQOS "Jl 



Appendix: A 



STUDIES OF AQUATIC INSECTS 



A PECULIAR NEW MAY FLY FROM SACANDAGA PARK 



BY JAMES G. NEEDHAM 



Among a small lot of neuropteroid' insects sent me by Dr Felt 

 for determination, was a new May fly with a remarkable develop- 

 ment of the adbomen. Five of the abdominal segments have their 

 flaring lateral margins expanded broadly, forming a wide parachute 

 or aeroplane. This peculiarity has its parallel among known May 

 flies only in the New Zealand species O n i s c i g' a s t e r w a k e - 

 f 1 e 1 d i ; a species that was described by McLachlan 36 years 

 ago, and made the subject of a special report by him to the British 

 Association for the Advancement of Science^ and an announcement 

 to the Entomological Society of London,- and of two special 

 papers.^ The last paper gave full descriptions of both nymphal and 

 adulf* stages. Eaton's Monographic Revision of Recent Ephcmcr- 

 idac pages 224-26 gives a description of the adult insect, and adds 

 [pi. 21, fig. 36] an excellent figure of the venation. In Hutton's 

 list of New Zealand Neuroptera^ is found another description of 

 the adult. In 1S99 Eaton^ added two additional New Zealan ' 

 species to the genus, O. intermedius, with considerably less 

 dilatation of the lateral margins of the abdominal segments, and 

 C . d i s t a n s , with hardly any lateral expansion at all. So Eatou 

 dropped from his characterization of tJie genus all mention of the 

 onisciform abdomen, that had brought the type species into such 

 prominent notice. In 1904 Hudson described the three species in 

 his New Zealand Neuroptera [p. 42-45] and added a much needed 

 description of the nymph of O . d i s t a n s [pi. i, fig. 1 1 ; pi. n, 

 fig. 15], which appears to agree quite well with that of the typical 

 species. 



The New York May fly about to be described exhibits a more 



' Rcjiort of 1873, p. 1 18 (1874). 

 ' Hrocof dinjjs for 1874, p. vi. 



' Ent. Mo. Mag. 10:108-9, wood cut, 1873; Linn. Soc. Zool. Jour. 1874. 12:39-46, pi. s, 

 fiR. i-S. 



* The fitfure of the adult is copied by Sharpe in volume s of the Cambridge Natural Ffistory. 

 •'> New Zeal. Inst. Trans. 1898. 31:218. 



• Ent. Soc. Lond. Trans, p. 292-93, pi. 10, fig. 6a, 66, 6c. 



