No. 39J ODONATA OF CONNECTICUT: COENAGRIONIDAE 67 



Enallagma carunculatum Morse 



Psyche, 7 : 208: 1895. 

 Nymph. — Color green or buff. 



Head : about twice as broad as long, the caudo-lateral margins 

 with a few spinules. Mental setae three, sometimes a small fourth 

 on each side ; labium extending between the first and second pair 

 of coxae; first two antennal segments and proximal third of 

 number 3 dark brown. 



Thorax : legs pale, the apical ring of the femora faint or absent ; 

 metathoracic wing-cases extending about to the middle of the 

 fourth abdominal segment. 



Abdomen : with well-developed lateral keels, those of the first 

 segment with 4 or 5 spines each, the second with 8 to 12 each, five 

 and six with 18-20, and the seventh and eighth with about 14 each; 

 spines of the fifth and sixth keel bunched at the apex; sometimes 

 as many as three together ; usually without small setae on the 

 venter of cephalic segments, but usually with long hairs on dorsum 

 of 2, 3 and 4. In mature nymphs there is an indefinite dark dorsal 

 stripe extending from near the apex of the third segment to the 

 seventh or eighth; gills (PI. 11, Fig. 3) transparent, lanceolate 

 with a broad opaque area along the axis from base to near the 

 tip; dorsal marginal spines of the median gill more than 20 in 

 number, and extending one-third to one-half the length of the gill 

 from the base ; the ventral spines of the same gill consisting of 

 only a few ; ventral spines of lateral gills similar to the dorsal 

 spines of the median ; ovipositor of the female extending to the 

 middle of the tenth segment. 



Measurements: total length, 13. 5-14 mm.; length of abdomen, 

 8-9 mm.; length of gills, 5.5-6 mm.; width of gills, 1.2 mm.; 

 length of metathoracic wing-cases, 3.6 mm. ; length of median 

 lobe, 2.5, width .5-2 mm. 



Adult, male, — Color dark blue or buff, and black. 

 Head : blue or buff and black, the labium buff, antennae black, 

 the first segment sometimes paler at apex; postclypeus with a 

 large, shining black spot, the ventro-lateral margins pale ; ante- 

 clypeus and labrum except a dorso-mesal black spot and a lateral 

 spot on each side, pale ; front above the clypeus to the bases of 

 the antennae pale, remainder black; postocular spots oval buff 

 or blue, and not usually connected with transverse line caudad of 

 the ocelli ; occiput and postgenae mostly pale. 



Thorax: blue or buff, and black, the pronotum black with 

 cephalic lobe, caudal margin of the caudal lobe, and small spots 

 on the lateral margins of the median lobes blue or buff; pale 

 stripe of the anepisterna of mesothorax regular, the margins 

 nearly parallel and straight, the stripe extending from the cephalic 

 margin nearly to the wing-bases ; black stripe of the meso- 

 pleural suture widest caudad of the katepisterna, extending onto 



