134 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



occiput, and small spines on the postgenae behind the occipital 

 ridge ; wings clear. Some females have pale streaks on the lateral 

 margins and dorsum of terga 2-8 inclusive, and the spot on the 

 margin of 9 is not U-shaped as in the male. 



Measurements : total length, male 39-44, female 39-44 mm. ; 

 length of abdomen, male 30, female 28-30 mm.; length of hind 

 wing, male 24, female 25-26 mm. 



New England. — June 6-June 15. 



Ophiogomphus carolus^* Needham 



Canadian Entomologist, 29: 183: 1897. 



Adult, male. — Color yellow or greenish and black. 



Head: greenish yellow; the vertex and caudal margin of the 

 front black ; occiput yellow. 



Thorax : yellow with dark stripe on the dorsal carina, another 

 on mesopleural suture, and a shorter one just above the latter on 

 the mesepisternum, not, however, reaching the wing bases ; 

 shoulders of the mesepimera also dark. 



Abdomen: with yellowish green dorsal marks widened con- 

 siderably at base on terga 2-9, but not reaching the apices of those 

 segments; segment 10 yellow with basal dark spot on dorsum, 9 

 with a large lateral spot on each side ; anal appendages spinose 

 beneath ; arms of the inferior appendage much wider at tip than 

 at base, and with a lateral tubercle. 



Female. — Occiput with two rather closely placed spines which 

 may, however, be wanting (Needham, Can. Ent. 29, PI. vii, Figs. 

 1-4; 1897). 



Measurements : total length, male 43, female 45 mm. ; length 

 of abdomen, male 30, female 30 mm. ; length of hind wings, male 

 24, female 27 mm. ; width of hind wings, female 8 mm. 



1* Woodruff collected in Connecticut a large series of supposed Ophiogomphus 

 johannus Needham. On examination I was surprised to find that the females of the 

 series did not run to johannus, in a key based on specimens in the Philadelphia Academy 

 of Natural Sciences and the Museum of Comparative Zoology at Cambridge. Speci- 

 mens were sent to Dr. Calvert and as a result of his findings as well as due consideration 

 the following notes were made: 



Ophiogomphus johannus — Differs from carolus mainly in the shape of the hamules. 

 Female in Philadelphia collection may not be johannus, but carolus, except for the 

 denticles between the occipital spines. Referred to johannus by Harvey on supposition. 

 Figures of male appendages given by Williamson, Ent. News 13, pi. iii, Figs. 3-5. 



Ophiogomphus carolus — Differs from johannus in accessories; female apparently 

 different from mainensis in occipital spines which are not contiguous (Needham Can. 

 Ent. 29, pi. vii, Figs. 1-4). 



Ophiogomphus maninensis — Occiput of female type near Woodruff's specimens except 

 for occipital horn, which is, however, similar to some specimens of Woodruff's which 

 have a small horn. Male not known certainly. Supposed male in M. C. Z. collection 

 is the same as carolus. Female may be either anomalus or johannus but rejected by 

 Calvert from anomalus because of character of occipital spines. 



O. johannus described from male only. Female not known certainly. Woodruff had 

 both sexes. 



O. mainensis described from female only. Male not known certainly. 



O. carolus, both sexes described, both differing from johannus and mainensis according 

 to various authors. 



The only way out of the difficulty (pending further researches) seems to lie in the 

 elimination of one of these species, which should probably be johannus. 



