No. 39] ODONATA OF CONNECTICUT: LIBELLULIDAE 255 



times as long as wide, and supported by three or more cross-veins ; 

 triangle 3-sided, considerably farther distad in the front wings 

 than in the hind ; M, with a conspicuous bend about as far distad 

 as the proximal end of the stigma ; subtriangle present in the male 

 (two cubito-anal cross-veins present) ; Cu^ arising exactly from 

 the caudal angle of the triangle in both wings ; prothorax with the 

 hind lobe entire, and almost without marginal setae ; abdomen of 

 the male with ventral hooks on the first abdominal sternum ; trans- 

 verse, median carinae on terga 2 and 3 (interrupted on meson on 

 2) ; general color brown and buff. 



The habits of the only representative of this genus are essen- 

 tially the same as those of Libellula. 



Fig. 64. Labium of the nymph of Plathemis lydia, greatly enlarged. 



Plathemis lydia (Drury) 



Illustrations of Natural History — Exotic Insects, 7: pi. xlvii, f. 4: 1773- 



Nymph (PI. iv, Fig. 7). — Color dark brown. 



Head: labium (Fig. 64) with median lobe about as long as 

 wide, the distal margin with shallow notches each containing a 

 short spine, and with broad, shallow, rounded lobes between ; a 

 prominent lobe at the center of the distal margin. Mental setae 

 9 to 10; labial palpi with 10 lateral setae; distal margins of the 

 palpi with six to seven teeth which are about as broad as long, 

 each with one to three spines ; front above the clypeus and labium 

 when folded in place, densely hairy, the caudo-lateral surfaces of 

 the head also setose. 



Thorax : pronotum with broad rounded setose margins ; pro- 

 pleura also hairy or setose; meso- and metapleura hairy; meso- 



