Xo8 CONNECTICUT GEOL. AND NAT. HIST, SURVEY [Bull. 



Female. — Color similar to the male. 



Thorax : mesopleural pale stripe not becoming black, usually 

 remaining brown and contracted near the wing bases ; dorsal 

 carina brown; metathorax remaining yellow for the most part 

 and usually not pollinose. 



Abdomen: dorsum of terga 1-9 green, the lateral margins 

 yellow, fading into brown, segment 10 brown ; ovipositor extend- 

 ing caudad of segment 10, the ventral margins of the lateral 

 valves usually brown. 



Measurements : total length, male 43-47, female 43-45 mm. ; 

 length of abdomen, male 34-38, female 34-36 mm. ; length of 

 hind wings, male 21-25, female 24-27 mm.; width of hind wings, 

 male 4.5-5, female 5-6 mm. 



Connecticut. — New Haven, 4 July, 1905 (H. L. V.) ; Hamden, 28 June, 

 13, 27 July, ^ August. IQ20 (P. G.) ; Guilford, 22 July, 1920 (P. G.) ; 

 New London, 7-22 June, 1921 (R. H. H.) ; Litchfield, 25 July, 1915 

 (L. B. W). 



New England. — May 28-September 7. 



Family AGRIONIDAE Leach 



The nymphs are sprawling in appearance and easily recognized 

 among Zygoptera by means of labial and gill characters. The 

 two lateral gills are three-sided, and the labium possesses a deep 

 median cleft. 



The adults include the black-winged Calopteryx or Agrion, a 

 widely distributed species commonly found along small brooks. 

 Their wings possess a great many more cross-veins in all parts 

 than are found in other Zygoptera. 



Key to Genera 



Nymphs 



I. Median cleft of median lobe of labium extending proximad of the 



articulations of the labial palpi (Fig. 7, No. 10) Agrion, p. 108 



Median cleft .of the median lobe extending only to the base of the 

 articulation of the labial palpi Hetaerina, p. 113 



Adults 



I. Wings with basilar space without cross-veins ; metapleural suture 

 only with a pale stripe ; often the entire pleura without pale 



marks Agrion, p. 108 



Wings with cross-veins in the basilar space; mesopleural, inter- 

 pleural and metapleural sutures with pale stripes. .Hetaerina, p. 113 



Genus Agrion Fabricius 



The nymphs are dark in color, including the gills which, how- 

 ever, have light bands across the middle. The femora of all the 

 legs also have light bands at about the distal third. 



