54 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



antenna; mesal margins of lateral ocelli, and narrow margins of 

 the large postocular spots. 



Thorax : pale blue ; median pronotal lobes with a curved black 

 spot on each side, and another short dash on each side below it, 

 extending onto the sides of the prothorax ; dorsal carina of meso- 

 thorax with a very narrow dark line on each side, hardly wider 

 than the carina itself ; mesopleural suture with a thin line of dark 

 pigment, much widened at middle and at either end ; dorsal and 

 caudal margins of katepisternum dark ; hind tibia with six spines 

 below on the outer side, and a dorsal dark stripe from base to 

 apex ; wings as in Fig. 42. 



Abdomen : blue or greenish yellow with narrow dorsal dark 

 stripes on terga 1-7, that on 7 narrowed to a line, the caudal 

 fourth or fifth of the segment mostly blue, segments 8, 9, and 10 

 entirely blue. Superior anal appendages (Fig. 42, Nos. 3, 4) with 

 a rounded ventral lobe, and a truncate distal projection, the 

 inferiors slightly longer. 



Female. — Blue of male replaced by brown or greenish yellow, 

 that of the head by brown. Color of abdomen differs from the 

 male in having dorsal stripes on segments 1-8 inclusive, segments 

 9-10 blue. 



Measurements: total length, male 41, female 35 mm.; length 

 of abdomen, male 35, female 29 mm. ; length of hind wings, male 

 22, female 20 mm. 



Described from a pair obtained through the courtesy of Mr. 

 Wm. T. Davis, collected at Southern Pines, North Carolina, June 

 9, 1920. The species has not yet been found in Connecticut, but 

 occurs in New Jersey and southward as far as the Carolinas. 



Genus Enallagma Charpentier 



Nymphs. — Head without projecting caudo-lateral margins, the 

 latter rounded instead ; labium with mental setae ; abdomen with 

 spinulose lateral keels ; gills less than half as broad as long, with 

 or without cuticular pigment, but usually with conspicuous 

 tracheae, and generally with blunt points, not, however, as rounded 

 as those of some Argias; length when grown about 20 mm. 



Adults. — Postocular spots present ; wings usually with less 

 than 12 postnodal cross-veins, and M^ arising between the 4th 

 and 6th in the front wings ; width of stigma nearly equal its 

 length or much less ; dorsum of thorax never entirely metallic 

 green, usually brown or black with lighter-colored stripes ; caudal 

 margin of the female pronotum never trilobed ; the tibial setae 

 never twice as long as the intervals between their bases (scales or 

 flattened setae excepted) ; mesopleural suture usually with a 

 black or dark brown stripe ; abdomen with terga 1-6 never entirely 

 red or yellow, and the female with a spine on sternum of 8. 



