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



Measurements: length, 14-15 mm. ; length of abdomen, 9 mm. ; 

 length of gills, 5 mm.; width of gills, 1.8 mm.; dimensions of 

 median lobe, 2 mm. by .7-1 mm. 



Adult, male. — Color blue and black. 



Head : face below antennae pale except a black spot on post- 

 clypeus ; dorsum of head black ; postocular spots large, subcunei- 

 f orm, and not connected with the postocellar stripe. 



Thorax: black and blue or buff; pronotum dark with pale 

 cephalic and caudal margins and a semicircular spot on each side 

 near lateral margins. Coxae and trochanters pale ; femora brown 

 above with a pale spot on one side at base; tibia with cephalic 

 half of dorsum black; tarsi and claws brown, sometimes pale 

 above. Mesothorax with a heavy black stripe on the suture, 

 widened at the hind margin of anepisternum ; remainder of meso- 

 and metapleura pale except a small black spot on metapleural 

 suture near wing bases ; venter pale. Wings clear, M^ arising 

 between postnodal cross-veins 3 to 5 in the front, and 3 to 4 in the 

 hind wings. 



Abdomen: blue and black, the terga with black as follows: 

 basal spot on i, apical spots and rings on terga 2-6 inclusive, the 

 spots not over one-fourth or one-fifth*^ as long as the segments 

 (on 3-6), all of 7, and dorsum of 10 also black; terga 8 and 9 

 blue. Anal appendages (Fig. 10, No. 11) consisting of flattened 

 superiors and longer inferiors. 



Female. — Color similar to the male ; mesostigmal plates broad 

 (Fig. II, No. 6), the caudal margin rounded and elevated; pro- 

 notum with two conspicuous pits, caudad of the middle one on 

 each side and usually just behind the pale lateral spots. 



Measurements : total length, male 30, female 28 mm. ; length 

 of abdomen, male 22, female 22 mm. ; length of hind wings, male 

 17, female 18 mm. ; width of hind wings, male 3.5, female 3.5 mm. 



Connecticut. — Salisbury, 13 June, 1926 (P. G.) ; 14 July, 1926 

 (W. E. B.). 



New England. — May 30-August 10. 



Enallagma laterale Morse 



Psyche, 7: 274: 1895. 



Nymph. — Not available for study. 



Adult, male. — Color blue and black. 



Head : pale below the antennae except a transverse black stripe 

 on the postclypeus ; dorsum of head black, pale postocular spots 

 comma-like; rear of head mostly pale. 



Thorax : pronotum black, the cephalic margin pale ; propleura 

 pale below ; femora dark above, pale below, tibiae with dark line 

 covering the cephalic setae. Tarsi and claws brown, darker at 



•Walker (Can. Ent. 56, 173: 1924) describes a specimen with dark abdomen, but this 

 seems to be unusual. 



