No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 235 



granular, the caudal margins rounded, but with a distinct ridge 

 approximated to the anterior margin of the pronotum. 



Thorax: pronotum with a ridge on the caudal margin which 

 curves forward on the sides and ends in a blunt tubercle; just 

 above the procoxae there is a single blunt protuberance; sides of 

 the mesp- and metathorax dark brown, spotted with yellow ; pro-, 

 meso-, and metacoxae successively further apart in the order 

 mentioned ; femora brown, with two yellow rings on each, without 

 carinae; tibiae with 2 yellow rings each, and a curved ridge 

 beginning on the cephalic surface at base, curving on to the ventral 

 surface and disappearing at about the mid point ; tarsi dark brown, 

 the distal segment about as long as the two proximal ; metathoracic 

 wing-cases extending to the middle of abdominal segment 5. 



Abdomen : flat below, arched above, the lateral keels with con- 

 spicuous spines on 8 and 9 as in PI. iv. Fig. 6 ; dorsal surface 

 with mesal hooks on 1-9; segment 10 narrow, about one-fourth 

 as long as 9 ; superior anal appendage almost triangular, the lateral 

 appendages three- fourths as long as the superiors ; the dorsal 

 surface of the abdomen is granular in appearance owing to th^ 

 presence of small setae, but there is a double row of smooth scars 

 4-8 and a single scar on 2, 3 and 9. 



Measurements: total length, 21 mm.; length of hind femora, 

 5.5 mm. ; length of metathoracic wing-cases, 5.5 mm. ; length of 

 abdomen (to tip of lateral spines), 13 mm., greatest width, 9 mm. 



Described from a cast skin obtained from Dr. P. P. Calvert. 



Adult, male. — Color brown marked with yellow. 



Head: brown, labrum yellow, front and vertex olive. 



Thorax: pale brown, pilose with a yellow spot on the met- 

 episterna covering the spiracle; legs brown; wings (PI. x, Fig. 4) 

 smoky with a patch of dark brown on the anal angle in the hind 

 wing, and another patch on base of front wing; antenodal cross- 

 veins infuscated and a dark spot on the nodus, which may, how- 

 ever, be absent. 



Abdomen: brown to black; anal appendages with the inferior 

 entire, tapering to an acute point; superiors viewed from above, 

 expanded on the distal half as in Tetragoneuria simulans. 



Female. — Vulvar lamina consisting of short lobes, less than 

 I mm. long, and separated by about the width of each lobe at 

 middle. 



Measurements : total length, male 45, female 42-45 mm. ; length 

 of abdomen, male 28-30, female 30 mm. ; length of hind wings, 

 male 28-30, female 32 mm. ; width of hind wings, male 10, female 

 8-10 mm. 



Specimens examined in collection of P. P. Calvert ; one female 

 in this collection has very little coloring in the wings and almost 

 none in antenodal cross-veins; also one specimen from Squam 

 Lake, N. H., obtained from Dr. Howe. 



New England. — June 10- August 30. 



