290 H. A. HAGEN. 



body, rounded above, but not cylindrical as C. hidentatus, more flattened beneath : 

 four apical segments tapering and shorter; apical margin of 6 to 9 concave; short, 

 strong, lateral spines bent down on tip on 8 and 9; all apical margins with a 

 dense fringe of long hairs, also the sides very hairy; anal appendages not full 

 twice as long as 10th; tip sharp, bent down; the middle one nearly as long as 

 inferiors ; lateral ones not full as long as 10th, conical, tip sharp, bent down ; ab- 

 domen below covered with fine, short hairs; longitudinal sutures straight, space 

 between them four times as broad as the lateral space; female ovipositor conical, 

 bifid nearly to base, a little flattened below, reaching 10th segment; legs very 

 hairy, the inferior margin with numerous spines; tibiae about as long as femora; 

 tarsi a little shorter ; claws sharp. 



The nympha from Luenburg, Hanover, described and figured by Mr. 

 Cabot, is only 30 mm. long, about half grown ; the supposition that this 

 nympha belongs to C. amiulatus, is now corroborated by the raised nym- 

 pha. The statement by Mr. Cabot p. 14, " not to be distinguished from 

 C. Sayi,'' was the result of insufficient material. C. annulatus diifers 

 from all N. American species by the sides of head straight behind the 

 eyes, the third joint of antennae longer than fourth and fifth together, 

 the lateral spines on 8th and 9th segments and the lateral appendages 

 strong, sharp, bent down or better incurvate on tip. 



47. Cordulegaster diastatops (supposition). 

 Selys Monogr. Gomphines p. 320. 



Cordidegaster Sayi Cabot p. 13, No. 15, pi. iii, fig. 2. 



Two young nymphge, dry, from Cambridge, Mass. ; six in alcohol from 

 Bethel, Me., male, female, very young, 10 mm. long to half grown (?) 

 25 mm. long ; one female in alcohol from Maryland by Osten Sacken ; 

 one from Pennington Gap, Cumberland Co., Va., by H. G. Hubbard, 

 August, 1879 ; two about full grown females from Chicopee, Mass., R. 

 H. Wheatland, July 1, 1860, long 40 mm. Length 10 to 40 mm. 



Body more slender, very hairy; head half as long as broad; sides running semi- 

 circularly to occiput, differing from C. bidentatus by a little notch just behind the 

 eye, after which the very strong and somewhat projecting curve begins, ending 

 nearly angular at the narrow occiput; the internal angle of eyes reaches nearly 

 the vertex; antennae with third joint very little longer than second, fourth to 

 seventh shorter, nearly equal; joint three shorter than four and 5 together; abdo- 

 men more slender, segments 8 and 9 with strong lateral spines; feminal genitals 

 appearing first in nymphse 23 mm. long ; tip of appendages bent down very little ; 

 wing cases of very young ones not exceeding the segments of thorax, otherwise 

 similar to C. bidentatus. I am not sure if large specimens from Chicopee belong 

 here, except the somewhat broader head no differences are found. 



When Mr. Cabot described this species I did not know that C. Sayi 

 was a different species from C. diastatops ( C. hiteralis). I confess that 

 some nymphae could as well belong to C mdcuhitua, at least those from 

 Chicopee ; all others look entirely alike. 



