No. 39] ODONATA OF CONNECTICUT: GOMPHIDAE 155 



Abdomen with short lateral spines on segments 7 to 9 inclusive, 

 that on 9 one-third as long as segment 10 ; dorsal hooks rudimen- 

 tary, present as indefinite elevations on segments 4-7 inclusive ; 

 segment 9 not elongate, 4 mm. wide at base and 2 mm. at hind 

 margin ; length measured on dorso-meson 2.5 mm. ; segment 10 

 cylindrical, short (i mm.), about as long as the terminal appen- 

 dages ; lateral scar on each side of dorsum of 9 long and narrow, 

 nearly as long as the segment ; group of three scars on each side 

 of 8, and five to six scars each in a closely associated group on 

 each side of segments 4 to 7 inclusive. 



Measurements: total length, 31 mm.; length of abdomen, 19 

 mm. ; greatest width of abdomen, 7 mm. ; length of hind femora, 



6 mm. 



Described from exuviae of a reared specimen in the American 

 Museum of Natural History reared by Mr. L. B. Woodruff and 

 bearing the label "Litchfield VI : 10 : 24." 



Adult, male. — Color brown and olive. 



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

 ocellar area brown ; occiput pale ; postgenae brown to black, paler 

 on sides. 



Thorax : meso- and metathorax obscurely marked ; the mes- 

 episterna each with a broad pale stripe at middle, which usually 

 connects with the mesothoracic half-collar ; a narrow pale stripe 

 above the mesopleural sviture, and another on each mesepimera 

 from shoulders to wing-bases ; metepisterna smoky ; dorso- 

 cephalic half of metepimera pale. 



Abdomen: dark brown to black, pale on sides of terga i, 2, 

 and base of 3; pale mid-dorsal streak on 1-5 or 6, and spots at 

 the base of terga 7 and 8; dorsum of 10 and sometimes 9 olive; 

 legs brown ; tibiae pale above ; anal appendages black, the supe- 

 riors in dorsal view with a lateral angle, in lateral view the ventral 

 margins with a rounded projection near apex of each. 



Female. — Femora uniform brown; margin of occiput nearly 

 straight, depressed at center ; terga with obscure margins ; length 

 of terga 8, 9 and 10 measured on dorsum, 3, 3, and i mm. respec- 

 tively ; vulvar lamina (Fig. 20, No. 5) short, only one-seventh as 

 long as sternum 9, the plates rounded and separated at tips by a 

 broad obtuse emargination. 



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

 abdomen, male 34-35, female 35-36 mm. ; length of hind wings, 

 male 29-30, female 29-34 mm. ; width of hind wings, male 8, 

 female 9 mm. ; length of stigma, male 2.5-3.5, female 3-3.5 mm, 



Connecticut. — One female taken in Westville, June 2, 1908, by Mr. 

 B. H. Walden, belongs here. Winsted, 13 June, 1926 (P. G.) ; Cornwall, 



7 June, 1925 (L. B. W.). 



