THE CANADIAN ENTOMOLOGIST 139 



Plate VIII. — Gryllohlatta campodeiformis, terminal abdominal segments and 

 genitalia of male. 1, adult, dorsal view; 2, same, ventral view; 3, same, caudal 

 view; 4, same, ventro-caudal view; 5, nymph, stage A, ventral view; 6, nymph, 

 stage B, ventral view; 7, same, caudal view. 



Plate IX. — Gryllohlatta campodeiformis. 8, adult male, right lateral view of 

 terminal abdominal segments; 9, left lateral view of same; 10, female nymph, 

 ventral view of terminal segments; 11, same with ventral valves bent forward 

 to show inner valves; 12, diagram of probable method of coupling; 13, adult 

 male dorsal view; 14, male nymph, stage A; 15, male nymph, stage B. 



THE MAY-FLY OVIPOSITOR, WITH NOTES ON LEPTOPHLEBIA 



AND HAGENULUS* 



BY EMILY REED MORRISON, WASHINGTON, D.C. 



The biological and morphological information contained in this paper was 

 obtained from field trips made at Cornell University in the early summer of 

 1917, and from a laboratory study of the material thus collected and of related 

 forms in the University collection. The work was undertaken at the sug- 

 gestion of Dr. J. G. Needham who called the writer's attention to this may-fly 

 and to the unusual structure present on the seventh and eighth abdominal 

 segments of the adult female, and suggested that it might prove an interesting 

 subject for a summer's study, an examination of other related species perhaps 

 revealing similar modifications heretofore unnoted. For this original suggestion 

 and for subsequent additions and corrections to the work, the writer is greatly 

 indebted to him. 



This species was first described by Dr. Needham (3) as Choroterpes hetteni 

 from specimens which had been collected by Dr. Cornelius Betten near Hamburg, 

 N. Y., in 1906. Only adults were available for study at that time, and the 

 species was doubtfully referred to the genus Choroterpes. Ten years later Dr. 

 Needham found a swarm of little red may-flies near McLean, New York, which 

 upon examination proved to be the same species ; and in the nearby stream were 

 the reddish-brown nymphs which he suspected to be its immature form. An 

 examination of the nymphs showed that they belonged to the genus Leptophlebia. 

 The observations and breeding work of the writer confirmed Dr. Needham's 

 opinion that both nymphs and adults were the same species, Leptophlebia betteni. 



Habitat. 



The local habitat of this species is rather unique. It lies in the midst of 



a series of peat and grass bogs which are located near McLean, New York. 



Both the fauna and flora of this region are extremely localized, owing to the 



peculiar manner of the formation of peat bogs. The water in the streams which 



run through the peat bogs is of a deep coffee colour. It is in such a coffee-coloured 



stream which runs from a pond in the midst of the bogs that the nymphs of 



Leptophlebia betteni live, on logs which have dropped into the stream and have 



become water soaked and partially rotted. The brown nymphs were found in 



the longitudinal fissures of these logs, and so closely do they resemble the wet 



wood in colour that it is impossible to distinguish them when they remain 



motionless. On the logs with them may be found numerous Parnid beetles, 



*Contribution from the Entomological Laboratory of Cornell University. 

 June, 1919 



