l6o CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



of each; sides of i, 2, and 3 pale, the marks about 2 mm. in width; 

 terga 8 and 9 largely dark brown, paler on the sides in some ; 

 segment 10 and anal appendages olive; margins of tergum 8 

 projecting ventrad, those of 9 nearly straight; accessory appen- 

 dages as in Fig. 21, No. 8. 



Female. — Vulvar lamina (Fig. 20, No. 11) about one-third as 

 long as the ninth sternum ; occiput with a conspicuous denticulate 

 spine at middle. 



Measurements : total length, male 52 mm., female 58 mm. ; 

 length of abdomen, male 37-39, female 38-41 mm. ; length of hind 

 wings, male 29-32, female 33-34 mm. ; width of hind wings, male 

 8.5-9.5 mm. 



Connecticut. — Described from specimens in collection of P. P. Calvert. 

 A specimen collected in the vicinity of Storrs, Conn., but without place or 

 date, has been examined: Hamden, 6 June, 1927 (P. G.). 

 New England. — June 6-June 30. 



Group 4 ScuDDERi-AMNicoLA Group 



Gomphus amnicola Walsh 



Proceedings of the Academy of Natural Sciences of Philadelphia, 396: 

 1862. 



Adult, male. — Color yellow and dark brown to black. 



Head : f ronto-clypeal stripe dark, anteclypeus pale or smoky ; 

 ventral margin of labrum black. 



Thorax : pronotum with pale spots on median and caudal lobes, 

 those on the different lobes in contact; lateral pale spots appar- 

 ently wanting; mesepisterna dark, each with a short isolated pale 

 stripe near the dorsal carina, the two converging caudad; a pale 

 streak over the mesopleural suture ; dorsal third of cephalic 

 shoulders of the mesepimera dark, and the interpleural suture also 

 lined with dark; remainder of thorax pale (Fig. 22, No. 4) ; legs 

 with dark femora, the hind femora with basal half yellow, and the 

 caudal surfaces of front and middle femora also pale. 



Abdomen : black with bright yellow as follows : dorsum of 

 tergum, dorso-mesal stripe on 2, narrow stripe on 3, basal spots on 

 4-7, the latter showing a tendency to form stripes in some speci- 

 mens ; tergum 7 with a narrow elongate lateral spot sometimes 

 remote from the margin, 8 and 9 with broad yellow lateral spots 

 in contact with the margin only at the cephalo-lateral angles ; ter- 

 gum 8 with a bright basal spot on meson ; accessory appendages 

 characteristic (Fig. 21, No. 2) ; anal appendages black. 



Female — Abdominal segments with more yellow on sides ; vul- 

 var lamina one-fourth or one-fifth as long as sternum 9. 



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

 of abdomen, male 35, female 35-36 mm. ; length of hind wings, 

 male 29-31, female 33 mm.; width of hind wings, male 9.5 mm. 



Described from specimens in collection of Dr. P. P. Calvert. 



