No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 239 



first two segments brown (tip of second lighter), setose; a promi- 

 nent fringe of setae between the antennal bases; rear of head 

 brown with a few setae on caudo-lateral angles ; labium with 

 10-12 mental setae and 7 lateral setae on the palpi, with a group 

 of about 10 small spinules at base; teeth of palpi short with a 

 tendency to overlap, the middle teeth with four spines ; 8 notches 

 on each palpus. 



Thorax : mid-dorsum of pronotum black ; two broad black 

 bands on sides of the mesa- and metathorax, the dorsal stripe 

 extending onto the sides of the pronotum, the ventral stripe con- 

 sisting of a short dash over the metacoxae ; wing cases black or 

 very dark, their dorsal margins pale; legs brown without con- 

 spicuous rings. 



Abdomen: brown, with narrow mid-dorsal pale line; sides 

 obscurely mottled, the lateral scars on 5 to 8 paired and frequently 

 with brown spots alongside; dorsal hooks almost obsolete, most 

 distinct on segments 6 and 7, indicated as small elevations on 5 

 and 8; lateral spines on 8 and 9 short, that on 8 one-seventh as 

 long as the lateral margin, that on 9 a trifle longer, both incurved ; 

 lateral and ventral margins of 9 with very long hairs or setae, those 

 of the ventro-caudal margin extending twice as far to the rear as 

 the terminal appendages ; caudal margins of 7 and 8 with a few 

 long setae on either side of the dorsum and several grouped about 

 the dorsal prominences ; terminal appendages together with seg- 

 ment 10 well telescoped into segment 9; laterals about three- 

 fourths as long as the ventrals. 



Measurements : total length, 18 mm. ; length of abdomen, 

 II mm., greatest width, 7 mm.; length of hind femora, 5.5 mm. 



Described from two reared specimens and a number of full- 

 grown nymphs. It differs from lepida in lacking a dorsal hook 

 on segment 9. 



Adult, male. — Color metallic green and black ; base of abdomen 

 with brown or yellow marks. 



Head : labium brown, labrum and anteclypeus black or dark 

 brown, front and postclypeus metallic green; occiput and post- 

 genae black; compound eyes bright green below, brown above; 

 in preserved specimens entirely brown. 



Thorax: pronotum black with caudal lobe and frontal margin 

 brown; meso- and metathorax metallic green and bronze, the 

 sutures slightly darker ; legs black, the tibiae of the hind legs each 

 with a pronounced ventral ridge with spine-like projection at tip; 

 wings (PI. X, Fig. 3) clear, with 7-8 postnodal cross-veins; 7-8 

 antenodal cross-veins in the front wing and 5 in the hind. 



Abdomen: dark metallic green or black with brown or yellow 

 marks on the sides of terga 2 and 3 ; anal appendages black, the 

 superiors in lateral profile with a tooth at base, the distal half 

 expanded and the tips sharply pointed and upturned ; inferior 

 appendage nearly as long as, or longer than the superiors, the tips 



