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



Female. — Ventral margins of abdominal segment 8 leaf-like, 

 projecting ventrad. The entire costal area of the wings is chlor- 

 inate in the female. 



Measurements : total length, male 44, female 43 mm. ; length 

 of abdomen, male 24, female 27 mm. ; length of hind wing, male 

 34-35, female 33-36 mm. ; width of hind wing, male lo-ii, female 

 II mm.; length of stigma, male 3.5, female 4 mm. 



The genitalia of both sexes are different from all other Libel- 

 lulas, but the figuration of the wings should enable any one to 

 distinguish the species. The abdomen is setose in contrast with 

 other members of this genus. 



Connecticut. — Hamden, 30 May, 19 June, 1922, 15 June, 1923 (P. G.) ; 

 Storrs, 25 May, 1923, J. Cronin. 



New England. — May 19-August 15. 



Libellula semifasciata Burmeister 



Handbuch der Entomologie, 2: 862: 1839. 



Adult, male (PI. xxi. Fig. 9). — Color brown to black, and 

 yellow. 



Head : labium, labrum, clypeus and front usually yellow but 

 often assuming an orange tint ; vertex brown and feebly concave, 

 yellow or orange at tip ; occiput and postgenae almost entirely 

 yellow. 



Thorax: prothorax brown, the caudal margin of the pronotum 

 entire and with short hairs ; meso- and metathorax dark brown to 

 yellowish green, the dorsum slightly darker, young individuals 

 having a poorly defined whitish stripe on the mesepimera, and 

 the entire epimera yellow ; older specimens with these marks 

 obscured ; the lateral carinae, however, between metepimera and 

 thoracic venter is nearly always yellow ; legs with brown to olive- 

 colored coxae, trochanters and front femora, the middle and hind 

 femora about half brown; tibiae and tarsi black, the tarsal claws 

 with ventral teeth beyond middle, the proximal portion of the claw 

 thicker than the distal ; wings with much yellow, especially at base, 

 where it covers the entire wing to the triangle : veins mostly brown 

 or yellow ; front wing with area between the sectors of the arculus 

 and between Cu and A proximad of triangle, dark brown, in the 

 hind wings including also the triangle, supertriangle, both cubito- 

 anal cells, and a small area behind these ; both wings with a nodal 

 spot, half the width of the wing and the apex from proximal 

 margin of the stigma, dark brown, flie area beyond the distal 

 margin of the stigma much lighter in color ; membrane white to 

 gray. 



Abdomen: brown and black, the proximal segments somewhat 

 greenish. The following portions are black: dorsum of the first 

 tergum, an obscure dark apical spot on 5, and a black mid-dorsal 

 stripe from 5-10, widened on apical and proximal margins of 



