No. 39] ODONATA OF CONNECTICUT: GOMPHIDAE 167 



segments 6 to 9, no dorsal prominences except on segment 9. 

 Labium as in PI. v, Fig. 14. 



Measurements : total length, 36 mm. ; length of abdomen, 

 25 mm. ; length of hind femora, 4 mm. ; dimensions of segment 9, 

 5 mm. long by 2 mm. wide. 



Adult, male. — Color black and yellow. 



Head: face black with the dorsum of the front pale. 



Thorax : mesepisterna with the pale stripe .75 mm. wide, not 

 connected with the pale collar, and with considerable interval 

 between the caudal end and the dorsal carina; a pale streak over 

 the mesopleural suture ; metepimera with pale stripe i mm. wide 

 by 5.5 mm. long; metepisterna with a pale streak, the dorso- 

 cephalic margin of the metepimera dark, remainder pale. 



Abdomen: black with small mid-dorsal pale spots at base of 

 segments '}^-'j inclusive ; lateral margins of 8 and 9 pale ; anal 

 appendages black, the superiors without spines in lateral or dorsal 

 view ; accessories with long tapering hamules, vesicle prominent. 



Female. — Vulvar lamina very short, about three times as broad 

 as long. 



Measurements : length of abdomen, male 46, female 47 mm. ; 

 length of hind wings, male 37, female 39 mm. ; length of abdom- 

 inal segments 8, 9 and 10, 4, 5.5 and i mm. 



According to Williamson this species flies from July to Sep- 

 tember. 



Genus Dromogomphus Selys 



N3miphs. — Proximal segment of labium hooked; third anten- 

 nal segment, long, cylindrical ; fourth segment small, its length 

 less than the width of the third segment; middle coxae not more 

 closely approximate than the front; dorsal projections on abdo- 

 men, segments 2-9 ; and segment 9 with mid-dorsal ridge ending 

 in a sharp spine. 



Adults. — Wings without subcostal vein ; triangles without cross- 

 veins ; anal loop in hind wings consisting of two cells ; occiput 

 with a distinct ridge between compound eyes. Hind femora with 

 long spines interspersed with shorter ones, and reaching the caudal 

 margin of the second abdominal segment. 



Key to Species 



Adults 



Males and Females 



I. Hind femora entirely black; dorsal pale stripe of mesepisternum 

 not reaching the katepisternum ; segments 8, 9, and 10 mostly 

 black, the cephalic half of segment 3-6 not pale in the male, with 



black transverse interrupted dashes spinosus 



Hind femora in part yellow; pale stripes of the mesepisternum 

 reaching the katepisternum ; segments 8, 9 and 10 almost entirely 

 pale, the basal half of segments 3-6 in the male pale with black 

 transverse dashes interrupted on the meson spoliatus 



