AQUATIC INSECTS IN NEW YORK STATE 271 



LIBELLULINAB 



Sympetrum corruptum Ha gen 

 Prof. T. D. A. Cockerell took this species in transformation 

 at Tempe Ariz, on Salt river Mar; 30, 1902, and kindly sent me 

 specimens which he has allowed me to describe herewith. He 

 sent me alsQ a single male with its cast nymphal skin labeled 

 Las Vegas N. M., October 1901. Thus we have the life history 

 of this species from the western end of its range, and, though 

 coming from an unexpected quarter, it makes a very desirable 

 addition to onr knowledge of the fauna of the State. In New 



Fig. 16 End of abdomen of nymph of Sympetrum corruptum 



York State this species flies only in late summer and autumn 

 (in early spring I have twice found a specimen that, I suppose, 

 had hibernated); but in the southwest it flies throughout the 

 greater part of the season. 



Nymph. Length 19mm, abdomen 11mm, hind femur 4.5mm; 

 width of head 4.5mm, of abdomen 6mm. Body stout, little de- 

 pressed, sparsely hairy on the rear of the head, the outer margins 

 of the tibiae and the apex of the abdomen. Head much wider 

 than long, . with prominent eyes directed forward and almost 

 angulate anterolaterally; sides sloping behind the eyes to the 

 nearly straight hind margin, and scurfy hairy; top of head with 

 six longitudinal, scurfy hairy linos behind the transverse suture. 



Dorsum of the thorax fuscous, divided by a narrow longitudi- 

 nal, pale line; the sides with some ill defined fuscous markings;, 

 legs pale. 



