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



Abdomen : black and yellow, yellow as follows : a broad dorsal 

 stripe from 1-7 occupying half the terga on each side, spots below 

 the lateral carinae on 2 and 3, two small spots on eighth dorsum 

 at base and all of tenth dorsum; ovipositor composed largely of 

 the projecting eighth sternum. 



Measurements : total length, male 34, female 32-35 mm. ; length 

 of abdomen, male 21-23, female 21-23 mm. ; length of hind wing, 

 male 23-24, female 23-26 mm. ; width of hind wing, male 8, 

 female 8-9 mm. 



There is a great deal of variation in the amount of yellow on the 

 body and brown color in the wings. The males are mostly black 

 and without brown in the wings, but females may be found show- 

 ing nearly all stages between the light-colored female as described, 

 and the black male. 



Inhabits salt marshes along the sea shore. 



Connecticut.— Short Beach, 19 July, 1904 (P. L. B.) ; Stonington, 6 

 July, 1906 (J. A. H.) : Stratford, 29 June, 21 July, 1908 (W. E. B.), 9 

 July, 1920 (P. G.)- 



New England. — June 21-August 28. 



Genus Erythemis Hagen 



Nymphs. — Labium with about 13-15 mental setae in full-grown 

 nymphs ; 8 lateral setae on the palpi ; abdomen without dorsal 

 hooks or lateral spines, though sometimes a trace on segment 9 ; 

 anal appendages strongly decurved. 



Adults. — More than ten antenodals in the front wing ; proximal 

 and distal margins of the stigma parallel, the latter supported by 

 two cross-veins ; triangle three-sided, only slightly farther distad 

 in the front wings ; M^ not sinuate ; subtriangle absent ; Cu^ not 

 arising exactly from the caudal angle of the triangle in the hind 

 wings, but from the distal side ; hind margin of the pronotum 

 bilobed ; male without hooks on the venter of segment i ; trans- 

 verse median carina on segments 2 and 3 ; general color green and 

 black, or bluish. 



The adults of this genus are strong fliers, and the nymphs may 

 be found in small ponds or lakes. 



Erythemis simplicicollis (Say) 



Journal of the Academy of Natural Sciences .of Philadelphia, 8 : 28 : 1839. 



Nymph (PI. iv. Fig. i). — Color light brown (alcoholic speci- 

 mens), usually greenish when fresh. 



Head: mentum (Fig. 66) as broad or a little broader than 

 long, the cephalic margin projecting strongly between the palpi ; 

 in full-grown specimens with 13-15 mental setae; in younger 

 (6 mm. long) specimens lo-ii; labial palpi with 8 lateral setae 

 in older, 6 in younger specimens, the distal margins of the palpi 

 without visible teeth but with groups of spines, the mesal margin 



