9© CONNECTICUT GEOL. AND NAT. HIST. SURVEY [Bull. 



wing ; stigma surmounting one and one-half to two cells ; M^ 

 arising between the sixth and ninth postnodal in the front wing 

 and between the fifth and eighth in the hind. 



Abdomen: black (sometimes greenish) with pale basal rings 

 on segments 3-7 inclusive; last two segments become poUinose; 

 anal appendages (Fig. 12, No. 20) consisting of short club-like 

 superiors, and broad inferiors. 



Female. — Color light blue or olive, buff and black. 



Head : front genae and vertex pale blue or buff, the vertex with 

 indefinite black areas around the ocelli. 



Thorax : usually brown, sometimes blue ; mesostigmal plates 

 (Fig. II, No. 15) each with a short median somewhat acute 

 process projecting caudad over the cephalic margin of the epi- 

 sterna; mesepisterna and mesepimera without the broad dark 

 stripes of the male. 



Abdomen: black and blue or brown, the dorsum of terga 1-9 

 frequently with brown stripes. 



Measurements : total length, male 37-42, female 38-41 mm. ; 

 length of abdomen, male 28-33, female 29-32 mm. ; length of hind 

 wings, male 23-26; female 25-26 mm. ; width of hind wings, male 

 4.5-5.5, female 4-5-5-5 mm. 



Connecticut. — Putnam, 12 July, 1905 (H. L. V.) ; Shelton, 9 July, 1920; 

 Stratford, q July 1920 (P. G.) ; Litchfield, 6 July. 1913. 2S July. 1914, 16 

 July, 1916 (L. B. W.). 



New England. — June i6-August 30. 



Argia translata Hagen 



Bulletin de rAcademie royale . . . de Belgique (2), 20: 410: 1865. 



Nymph. — Color dark brown. 



Head : antennal segments brown ; lateral and mental setae 

 wanting; median lobe projecting strongly between the palpi. 



Thorax : legs with two femoral and three tibial brownish rings ; 

 wing-cases extending to about segment 4 in exuviae. 



Abdomen : with a pale dorsal longitudinal stripe, the cuticle 

 brown and with few setae; gills uniform dark brown, coarsely 

 granular when magnified ; some with a paler band at middle as 

 in tibialis or apicalis. 



Measurements: length of gills, 4-4.5 mm.; width, 1-1.5 mm.; 

 length of median lobe, 3 mm. 



The nymph differs from moesta and violacea in having three 

 broad, dark tibial bands, being similar in this respect to tibialis 

 and apicalis. The gills are uniform brown and considerably nar- 

 rower than other species. Described from four exuviae obtained 

 at Pistapaug Pond July 8, 192 1 ; no other Argias were found at 

 this pond and the exuviae, therefore, were assumed to be that of 

 translata. 



Adult, male. — Color black and brown. 



