l66 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [BuU. 



Gomphus ventricosus Walsh 



Proceedings of the Entomological Society of Philadelphia, 2: 249: 1863. 



Adult, male. — Color olive and black. 



Head : face yellow except the lateral margins of the labrum 

 and a preocellar stripe on the front ; ocellar area black ; occiput 

 pale ; postgenae black, pale at sides. 



Thorax (Fig. 22, No. 3) : with broad (i mm.) parallel yellow 

 stripes on the mesepisterna, and a pale streak above the suture ; 

 about half the length of the sclerite ; mesepimeral shoulders black ; 

 legs black, coxae but little paler ; wings clear. 



Abdomen: with pale mid-dorsal stripe on 1-6 or 7, the stripe 

 trilobed on segment 2, expanded at apex of i ; sides of i and 2 

 and base of 3 pale, and pale yellow spots on sides of 8 and 9 which 

 are remote from the margins ; a faint touch of yellow on side of 

 7 ; ventral margins of 8 considerably rounded, the distance between 

 the two measuring 5-6 mm. when fully expanded ; anal appendages 

 with slender superior (lateral profile), the tips spine-like; acces- 

 sory appendages similar to crassus, Fig. 21, No. 17. 



Female. — Vulvar lamina similar to vastus, the pointed tips more 

 divaricate (Fig. 20, No. 16). 



Measurements : total length, male 50, female 47 mm. ; length 

 of abdomen, male 33-35, female 34-35 mm. ; length of hind wings, 

 male 28, female 30 mm. ; width of hind wings, male 9, female 

 10 mm. 



Connecticut. — Salisbury, 13 June, 1926 (P. G.)- 



Group 6 Plagiatus-spiniceps Group 



Gomphus plagiatus Selys 



Bulletin de I'Academie royale . . . de Belgique, 21 : 57 : 1854. 



Nymph. — Labium shown in PI. v, Fig. 3. 



Adult, male and female. — A very large species occurring in 

 New Jersey, Pennsylvania and southwards, which may be distin- 

 guished from nearly all species of Gomphus by the brownish red 

 color of the abdomen, being almost entirely so in teneral speci- 

 mens. The species has not been captured in Connecticut. 



Measurements : total length, 60-63 mm. ; length of abdomen, 

 43-47 mm. ; length of hind wings, male 32-36, female 37 mm. ; 

 width of hind wing, male 9.5 mm. 



Specimens examined in the collection of William T. Davis, from 

 Long Island, New Jersey, Washington, D. C, and Florida. 



Gomphus spiniceps Walsh 



Proceedings of the Academy of Natural Sciences of Philadelphia, 389: 

 1862. 



Nymph. — Terminal abdominal segments greatly narrowed and 

 lengthened, about twice as long as wide ; lateral spines present on 



