70 CONNECTICUT GEOL. AND NAT. HIST. SURVEY [BuU. 



Female. — Color similar to the male though usually darker in 

 general appearance. 



Thorax : legs usually lighter than those of the male. Meso- 

 stigmal plates as in Fig. ii, No. 3. 



Abdomen : lateral margins of the terga yellowish, the basal 

 rings on 2-6 (Fig. 11, No. 24) usually not connected across the 

 dorsum as in carunculatum. 



Measurements : total length, male 29-33, female 30-32 mm. ; 

 length of abdomen, male 23-27, female 23-27 mm. ; length of hind 

 wings, male 17-20, female 19-20 mm. ; width of hind wings, male 

 and female 3.5-4 mm. 



Connecticut. — New Haven, 23 June, 1904 (H. L. V.), 3, 20 July, 1904 

 (W. E. B.) ; Whitneyville, 11 August, 1904 (P. L. B.) ; Hamden, 18 July, 

 1920: Branford, 21 July, 11 August, 1921 ; Guilford, 13, 27 July, 1920 

 (P. G.) ; New London, 7-22 June, 1921 (R. H. H.). 



New England. — May-September 22. 



Enallagma cyathigerum (Charpentier) 



Libellulas Europas, 163: 1840. 



Nymph. — This species has not been reared in America and it 

 may be found to differ from that obtained from Europe and 

 described in the Zygoptera of Illinois, pp. 534-535. It will 

 undoubtedly be found to be closely related to the nymph of calverti 

 and has been placed at the same point in the specific key. 



Adult, male. — Color blue and black. 



Head : blue and black ; postclypeus black ; antennae black ; 

 postocular spots large, rounded, and sometimes connected with 

 the pale color of the occiput. 



Thorax : blue and black ; legs black above, pale beneath ; black 

 stripe of the mesopleural suture narrowed caudad ; wings with 10 

 to II postnodal cross-veins in the front wing and 10 in the hind; 

 postnodal cross-veins arising near the fifth postnodal vein or 

 beyond in the front and between 4 and 5 in the hind. 



Abdomen : blue wath black as follows : spot at base of i ; spots 

 at apices of terga 2 to 5 inclusive; caudal half or three-fourths of 

 dorsum of 6 ; nearly all of seventh dorsum and all of the tenth ; 

 segments 8 and 9 blue; anal appendages as in Fig. 10, No. 15, the 

 superiors black or quite dark, inferiors pale. 



Female. — Similar to the male in color ; pronotum without con- 

 spicuous pits; mesostigmal plates (Fig. 11, No. 11) hollowed at 

 the cephalo-mesal angles. Color pattern as in Fig. 12, No. 25. 



Measurements : total length, male 30-32, female 31-32 mm. ; 

 length of abdomen, male 24-26, female 25-26 mm. ; length of 

 hind wings, male 16-21, female 19-20 mm. 



Connecticut. — Orange, 2 June, 1920; Stratford, 9 July, 1920; Hamden, 

 18 July, 1920; Twin Lakes, 13 June, 1926 (P. G.). 



