No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 211 



Thorax : pronotum with flaring and rounded margins ; a blunt 

 projection above each procoxa; meso- and metapleura with dark 

 mottling and an obscure lateral dark stripe on each side ; legs 

 brown, without spines, and with very faint ridges, the front and 

 middle femora showing 2 dark rings, the tibiae of the same with 

 a dark ring at base of each ; metathoracic wing-cases extending 

 to caudal margin of segment 4. 



Abdomen : brown with obscure mottling, the lateral keels with 

 spines on segments 8 and 9, those on 9 being about i mm. in 

 length, those on 8 about .25 mm. ; the distance from the tip of 

 the spine to the base of segment 9 measured on the lateral margin, 

 3-3.5 mm. ; dorsal hooks of abdomen consisting of slender ones 

 on segments i and 2, which are not greatly thickened at base, and 

 much larger ones on 3-9, the latter thickened, and those on 6-8 

 largest; anal appendages short, the laterals about half the length 

 of the ventrals, the dorsal appendage slightly shorter than the 

 ventral. 



Measurements: total length, 21 mm.; length of abdomen, 11- 

 12 mm. ; greatest width, 7 mm. ; hind femora, 6.5 mm. ; meta- 

 thoracic wing-cases, 5 mm. ; mentum, 3.5 long by 1.5-4 mm. wide. 



Described from 3 exuviae collected at Colebrook, June 1920, 

 and one loaned by Dr. P. P. Calvert from New Jersey. 



Adult, male. — General color dark brown to black. 



Head : brown, buff below ; front with a black T-spot, the stem 

 being considerably broader than the cross-arm. 



Thorax : brown with gray pile ; obscurely marked with black 

 on the shoulders of the mesepimera ; coxae, protrochanters and 

 profemora brown, remainder of the legs black ; tibiae with the 

 usual ventral ridge and apical scale-like spurs ; wings clear except 

 small, separated brown spots at the base of the hind wings, the 

 largest of which occupies about half the anal triangle. 



Abdomen : black, the first two segments almost entirely brown ; 

 terga 3-8 black, with lateral yellow spots on each side above the 

 lateral carinae ; venter of terga 4-8 each about half yellow ; seg- 

 ments 9 and 10 entirely black ; anal appendages black, the superiors 

 with a sharp ventral tooth, shortly proximad of the middle. 



Female. — Similar to the male, but with the black T-spot indis- 

 tinct ; superior anal appendages 1.7-2 mm. in length. 



Measurements : total length, male 45, female 43-46 mm. ; length 

 of abdomen, male 30, female 29-31 mm.; length of hind wings, 

 male 29, female 31-32 mm.; length of stigma, male and female, 

 2 mm. 



Connecticut. — Represented by two males in the collection of the Con- 

 necticut Agricultural Experiment Station taken at Goshen, July 6, 1919, by 

 M. P. Zappe. Also reported from Litchfield by Woodruff ; collected in 

 Hamden, May 30, 1922 (P. G.). 



New England. — May 19- July 23. 



