MATERIALS FOR A FAUNA CANADENSIS. 457 



low spots, each side with a basal divided blue spot ; second segment 

 with a basal dorsal line, each side with a transverse line upon the 

 middle, yellow, the last segment flat above ; wings hyaline, pterostigma 

 small, fuscous. Length 70 millim. ; alar expanse 96-100 millim. ; 

 pterostigma 3 millim. 



Hah.: U. S. Wisconsin, Indiana, Pennsylvania, Connecticut. 



Subf. GOMPHINA. 



CORDULEGASTER, LcacJl. 



0. oBLiQuvs, Seh/s. — M. OBLiauA, Say. 



Black, spotted with greenish yellow ; head yellow, with two black 

 bands in front, occiput tuberculoid ; thorax black with grey hairs, 

 dorsum with a cuneiform stripe on each side, sides each with two ob- 

 lique yellow stripes ; feet black, base of the femora fuscous ; abdo- 

 men long, equal, black, dorsum with a greenish-yellow central line, 

 which is dilated in the middle on segments 5-8 ; wings hyaline, pter- 

 ostigma long, fulvous. Length 83-88 millim. ; alar expanse 112-124 

 millim. j pterostigma millim. 



Hob. : U. S. Indiana, Connecticut, and Southward. 



GoMPHUS, Leach. 



G. PARVULUS, Selys. 

 Black ; head black, a fascia in front and two yellow spots ; thorax 

 black, dorsum with a small yellow line on each side ; sides yellow, with 

 two contiguous stripes and a third posterior, black ; feet black ; abdo- 

 men equal, black, the dorsum with a basal maculore yellow stripe ; 

 wings hyaline ; pterostigma blackish, fuscous. Length 40 millim. ; 

 alar expanse 54 millim. ; pterostigma 3 millim. 

 Sab. : Nova Scotia. 



G. spiCATUS, Hagen. 



Fuscous spotted with luteous ; head pale yellow ; thorax clothed 

 with fuscous hairs, dorsum with a stripe on each side, and the sides 

 with two stripes, luteous ; femora luteous, fuscous above ; tibiae black- 

 ish fuscous, exteriorly yellowish, tarsi black ; abdomen equal, inflated 

 at the base, fuscous, the dorsum with an interrupted yellow line, the 

 base with a yellow stripe at each side ; wings hyaline, pterostigma yel- 

 low. Length 49 millim. ; alar expanse 60 millim. j pterostigma 3 

 millim. 



Hah.: N. Y., Canada. 



