414 NEW YORK STATE MUSEUM 



are emerging; but the larger stone flies, and the paler and green ones are 

 to be looked for mainly in summer. 



Stone flies are abundant in most parts of the state of New York, 

 Every rocky stream swarms with them. But about Saranac Inn there 

 are no rocky streams. The creeks flow leisurely over beds of sand or 

 filter through mats of river weed, and are destitute of the stony obstruc- 

 tions which aff"ord suitable shelter for young stone flies. But two of the 

 smaller species were studied there, and these were neither abundant nor 

 very important members of the aquatic fauna. Both Hve in Little Clear 

 creek and in the pipes which bring water to the hatchery, and both were 

 taken as adults at the hatchery windows. Nathan Banks has pubHshed 

 keys to the North American genera of stone flies in the Transactions of 

 the American efitomological society, 20:328-29; and 26:240-42. The 

 student is referred to these. 



CHLOROPERLA 



This genus includes a small number of delicate, pale green stone flies 

 about half an inch long. At emergence they fly to the shelter of green 

 vegetation, and thereafter remain concealed most of the time, returning 

 to the water, perhaps, to deposit their eggs. So far as known, the 

 nymphs which live in clear streams are entirely destitute of gills. C. A. 

 Briggs has recorded a curious habit of the adult male of Chloroperla.i 

 Placed in a box, it struck the bottom with its penultimate abdominal seg- 

 ment to make a noise. 



Chloroperla bilineata Say 



1823 Sialis bilineata Say, Godman's western quarterly reporter. 2:165 



(original description) 

 1839 Chloroperla transmarina Newman Ann. & mag. nat. hist. (2) 3:87 

 1841 Chloroperla transmarina Pictet, Perlides, p. 283 

 1852 Chloroperla transmarina Walker, Cat. neur. ius. Brit. mus. 1:161 

 1852 Chloroperla picta Walker, Cat. neur. ius. Brit. mus. 1:161 

 1861 Chloroperla bilineata Hageu, Synopsis Neur. N. Am. p. 30 

 1892 Chloroperla bilineata Banks, Am. ent. soc. Traus. 19:342 (listed) 

 1899 C hi o roper la bilineata Banks, Am. ent. soc. Trans. 25:200 (in- 

 cluded in a key to species of Chloroperla) 



This species was taken only in the hatchery. It was already disap- 

 pearing when we arrived, June 15. A few could be found about the 

 windows each day. Many more dead ones were discovered in the 

 hatchery loft, entangled in spiders webs, or fallen on the window sills, 



1 Ent. month, mag. 1897. 33 : 207-8. 



