44 PAPERS ON ZOOLOGY OF MICHIGAN. 



tion very difficult. It might be well to state that L. forcipata and L. 

 rectangular is have either five or six raptorial setae while L. unguiculata 

 and L. uncata normally have seven setae. There seems to be no very 

 definite way to distinguish between each of the two species which have 

 been thus separated. The nymph of L. disjuncta, the only other 

 species of Lestes known from Douglas Lake, is unknown. 



GENUS LESTES LEACH. 



Imagos. 

 A. Males metallic green. 



B . Inferior appendages of the male viewed from above exhibiting a sigmoid curve. 



L. unguiculatus 

 BB . Inferior appendages of the male viewed from above strongly dilated at the ape.K. 



L. uncatus 

 AA. Males blacki.sh brown. 



C . Apex of the inferior appendages of the male declined. 



L. rectangularis 

 CC. Apex of the inferior appendages not declined. 



D. Inferior appendages of the male viewed from above slightly widened at the tip; 

 proximal tooth on the inner edge of the superior appendage larger than the other. 



L. forcipatus 



DD. Inferior appendages of the male not widened at the tip; the two teeth on the 

 superior appendage about equal. 



L. (Hsjunctus 



Lestes rectangularis Say. — A number of adults of this species were 

 taken both from the beach pool, which is located west of North Fishtail 

 Bay, and from Smith's Bog. Nymphs taken from the same habitat 

 as the adults were identified as L. rectangularis although they are very 

 similar to L. forcipata Rambur. 



Lestes forcipatus Rambur. — This species was taken by Miss Abigail 

 O'Brien during the summer of 1910. She reports that a number of 

 adults were taken on August 19 but does not state the locality from 

 which they were secured. No adults were taken in the collections upon 

 which the present report is based, and since the nymphs of this species 

 are so much like those of L. rectangularis they were not determined. 



Lestes unguiculatus Hagen.^One adult of this species and a number 

 of nymphs were taken on Maple River. The nymphs of this species 

 are very similar to those of L. uncatus Kirby. 



Lestes uncatus Kirl^y. — Neither adults nor n^nnphs were referred to 

 this species although it is possible that some of the nymphs identified as 

 L. unguiculatus may be L. uncatus. A number of adults were collected 

 by Miss O'Brien in 1910. 



Lestes disjuhctus Selys. — This species was not taken at Douglas Lake 

 in 1914 but were reported as common in 1910. 



