l62 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



beyond the distal segment or movable hook ; about four teeth on 

 the inner margin (PI. v, Fig. 17). 



Abdomen : elongate, tapering for half, its length ; a double row 

 of trapezoidal blackish spots between mid-dorsal line and the line 

 of scars on each side, each spot with a prolonged apical angle 

 reaching the apical carina on each segment, the spots on 9 and 10 

 becoming diffused over the sides of the segments ; a series of 

 minute, longitudinal, yellowish dashes in the apical suture of each 

 segment; mid-dorsal impressed line present and no dorsal hooks 

 save a mere rudiment on apex of ninth segment; lateral spines 

 well developed on segments 6-9, and tufts of hairs on lateral apical 

 angles of preceding segments, the spines increasing slightly in size 

 posteriorly, those of the ninth closely oppressed and hardly sur- 

 passing the base of the tenth segment. 



Measurements : total length, 42 mm. ; length of abdomen, 28 

 mm. ; width of abdomen, 8 mm. ; length of hind femur, 5.2 mm. 



Description from Needham 1901 ; p. 457. 



Adult, male. — Color yellow and black. 



Head : face black as follows : a spot on the f ronto-clypeal 

 suture narrowed at middle ; anteclypeus, ventral margin of labrum. 



Thorax: anterior femora pale beneath; spines of hind femora 

 arranged in two ventral rows ; pronotum mostly black or dark 

 brown ; meso- and metathorax marked as in Fig. 22, No. 9, mostly 

 dark, with a short pale stripe on each mesepisternum, and a pale 

 streak above the mesopleural suture ; mesepimera with a short 

 pale stripe below the mesopleural suture ; wings clear, stigma 

 4.5-7 mm. long in the front wing. 



Abdomen : terga black marked with pale, basal rings on 3-7, a 

 mid-dorsal stripe on tergum 2, a little more than half its length; 

 terga 8 and 9 with a triangular spot on mid-dorsum and spots 

 occupying the cephalo-mesal angles ; 10 black except the cephalic 

 margin ; anal appendages black ; auricles and sides of terga i and 

 2 pale. 



Female. — Vulvar lamina as shown in Fig. 20, No. 17. 



Measurements : total length, male 57-58, female 60 mm. ; length 

 of abdomen, male 40, female 44 mm. ; length of hind wings, 

 male 37-39, female 38 mm. ; width of hind wings, male 9, female 

 9-11 mm. 



Connecticut. — Cornwall, 11 September, 1925, meadow brook (L. B. W.). 



Group 5 Crassus-fraternus Group 

 Gomphus crassus Hagen 

 Bulletin de I'Academie royale . . . de Belgique (2), 46: 453: 1878. 

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

 Head : face including labium, labrum, clypeus and front pale ; 

 ocellar area black ; occiput pale ; postgenae black, pale at sides. 

 Thorax: pronotum with three obscure pale spots; meso- and 



