No. 39] ODONATA OF CONNECTICUT: AESHNIDAE 169 



of abdomen, male 40, female 41-42 mm.; length of hind wings, 

 male 34, female 35-36 mm. ; width of hind winces, male and female 

 lo-ii mm.; length of stigma, male 4, female 4-4.5 m.m. 



Connecticut.— Guilford (Pistapaug Pond), 8 July, 1921 (P. G.) ; 

 Windsor, 20 June, 1926 (P. G. ; J. L. R.) ; West Hartford, 15 July, 1913 

 (L. B. W.). 



New England. — ^June 12-September i. 



Dromogomphus spoliatus Selys 



Bulletin Academie royale . . . de Belgique, 21: 59: 1854. 



Adult, male. — Head: with pale face. 



Thorax : pale streak each side on femora, the hind femora with 

 6 long spines with about 5 smaller ones between, and with numer- 

 ous shorter ones at base; two pale stripes nearly equal on each 

 mesepisternum ; narrow dark stripe on each of the two lateral 

 sutures. 



Abdomen : tergum i pale on sides and with a pale dorsal line ; 

 2 with pale sides and dorsal streak ; 3 with pale sides and dorsal 

 streak, the dorsal streak connected at middle with pale sides ; 4 

 to 6 with basal fourth pale, also with pale dorsal streak ; 7 to 10 

 general color brown, their margins pale; dorsal anal appendages 

 viewed from the side, simple, pale, darker below and sharply 

 pointed ; ventral appendage broad, upturned at tip when viewed 

 from the side, in ventral view the arms divaricate, suddenly con- 

 stricted at tips ; tips blunt. 



Female. — Vulvar lamina similar to those of Gomphus descriptus 

 (Fig. 20, No, 13) but the plates more slender at tips. 



Measurements : total length, male 60, female 64 mm. ; length 

 of abdomen, male 43, female 46 mm. ; length of hind wings, male 

 36, female 37 mm. ; width of hind wings, male and female, 11 mm. 



Specimens examined in the U. S. National Museum. 



Family AESHNIDAE Rambur 



Nymphs. — Usually elongate insects ; labium flat with a closed 

 median cleft ; tarsi three-segmented ; antennae composed of cylin- 

 drical segments about equal in diameter and length ; abdomen 

 never broad and flat. 



Adults. — Compound eyes contiguous; tibial spines simple; 

 wings with an oblique cross-vein behind the proximal end of the 

 stigma ; female always with a well-developed ovipositor. 



A large group of strong fliers, being exceptionally quick on the 

 wing and hard to capture when fully mature. 



Key to Genera 



Nymphs 



I. Dorsal hooks on abdominal segments 7 to 9 Nasiaeschna, p. 193 



No dorsal hooks on abdominal segments 7-9 2 



