CONNECTICUT GEOL. AND NAT. HIST. SURVEY 



[Bull. 



two irregular rows of short spines, often several abreast in each 

 row; front row of spines of the middle and hind tibiae replaced 

 by small rounded tubercles, each with small seta of about the same 

 length placed distad of it and united with the tubercle at base; 

 tarsi with distal segment about as long as the two proximal ones 

 together, the claws with ventral tooth about the middle; claws 

 about as long as the middle tarsal segment ; wings clear ; stigma 

 brown, supported by 3-4 cross-veins; cubito-anal cross-veins 3;. 

 triangle with one cross-vein ; anal triangle with 4-5 cells. 



Fig. 13. Cordulegaster sp., structural details and color pattern of abdo- 

 men. Nos. I to 4, dorsal view of abdomens of diastatops, maculatus, 

 obliquus and crroneus. 5. Tibia of male obliquus showing tubercles on 

 ventral surface. 6. Ovipositor and terminal segments of diastatops. 



Abdomen (Fig. 13, No. i) : brown with yellow spots as fol- 

 lows: 6 on second tergum, two being on the ventral margin (on 

 each side) and two on each side above the auricles ; two cuneiform 

 spots on each side of segment 3 ; median lateral triangular spots 

 on the sides of 4-8 ; a minute dot at base of 9 ; lateral and dorsal 

 carinae lacking on all terga, but the terga contiguous on the ventro- 

 meson on segments 3-8; anal appendages consisting of a broad 

 inferior which is wider at apex than at base; superiors 1.2 mm. 

 long, the tips obliquely truncate, and the ventral surface with a 

 median tooth ; accessory genital appendages consisting of promi- 

 nent, bluntly pointed cephalic lamina with an elongate lateral 



