No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 203 



Measurements : total length, 25 mm. ; length of abdomen, 

 15 mm. ; greatest width, 12 mm. ; length of hind femora, ii mm. ; 

 length median lobe, 6 mm. ; width, 2-6 mm. 



Described from a nearly mature nymph obtained at Mt. Carmel, 

 Conn., October 29, 192 1 ; taken from a small woodland pond. 



Two smaller nymphs obtained at the same place and date differ 

 in having shorter lateral spines on abdominal segment 9 (not 

 reaching the tips of the terminal appendages) and fewer mental 

 setae (5 in number). Measurements of these nymphs are as fol- 

 lows: total length, 12 mm.; length of abdomen, 7 mm.; width, 

 5.5 mm. ; length of hind femora, 6 mm. ; length of metathoracic 

 wing-pads, i mm. 



Fig. 41. Wings of Didymops transversa, tracing from photograph, x 1.7. 



Adult, male. — Color grayish to brown. 



Head : brown to buff, the front with a T-spot and a conspicuous 

 depression above ; compound eyes contiguous. 



Thorax: brown, with buff spots on the mesokatepisterna and 

 paraptera of the front wings, and a conspicuous buff or whitish 

 stripe, about i mm. in width, extending from between the wings 

 to a point between meso- and metacoxae; legs brown, except the 

 tarsi, which are nearly black ; tarsal claw with ventral tooth nearly 

 at tip, the tooth nearly as long as the portion of the claw beyond 

 it; wings (Fig. 41) with brown or yellowish veins, and an infus- 

 cation at base ; anal loop nearly oval. 



Abdomen: strongly compressed beyond the third segment; 

 terga 2-8 with yellow spots on each side at base, those on 8 united 

 on the meson; segment 10 entirely yellow. 



Female. — Similar to the male; vulvar lamina short, widely 

 separated, and about one-sixth as long as the segment. 



Measurements : total length, male 52, female 55 mm. ; length 

 of abdomen, male 35, female 31 mm. ; length of hind wings, male 

 34, female 35 mm. ; length of stigma, male and female, 2-2.5 "i"^- 



Connecticut. — Mt. Carmel, 6 June, 1908 (B. H. W.) ; Southington, 16 

 June. 1926 (M. P. Z.) ; Litchfield. 6 June, 1925 (L. B. W.). 



New England. — May-August. 



