458 MATERIALS FOR A FAUNA CANADENSIS. 



G. coLUBRiNus, Hagen. — Ophiogomphus, col., Selys. 



Greenish -yellow ; head yellow, with four black lines, labium black 

 in the middle ; thorax greenish -yellow, a middle stripe, and one on 

 each side, narrovv fuscous; sides each \n\\\ three narrow black lines; 

 feet yellow, the posterior femora exteriorly fuscous, tibiae black, with 

 an exterior yellow line ; abdomen cylindrical, dilated before the apex, 

 the dors am black, segments 3-7 with a basal yellow stripe, the rest 

 with a yellow spot ; wings hyaline, pterostigma pale fuscous. Length 

 50 millim. ; alar expanse 64 millim. j pterostigma 3 millim. 



Hah.: Hudson's Bay. 



Subfam. Agrtonina. 



Agrion., Fahricius. 



A. vioLACEUM, Eiagen. 

 Violaceous : head with a transverse b^ack stripe above, a large viola- 

 ■oeous occipital spot on each side ; posterior margin of the prothorax 

 rounded, subexcised in the middle ; dorsum of the thorax violet, with 

 a narrow medial black stripe : sides pale violet, a bifid stripe above at 

 the wings, and a line upon the middle black ; feet pale, femora exte- 

 riorly, tibiae interiorly, and the whole of the tarsi black ; abdomen 

 violet, varied with black ; abdomen of female yellowish-green, varied 

 with black ; wings hyaline, pterostigma rhomboidal fuscous. Length 

 33-36 millim,; alar expanse 40-44 millim. 



Hob.: U. S. Mass. Connecticut, New York, Pennsylvania, Illinois. 



A. SAvciuM, Burnt, 



Eed ; head black above in the male, blackish fuscous in the female ; 

 posterior lobe of the prothorax short, the middle subdepressed ; dor- 

 sum of the thorax black in the male, red in the female, sides yellowish- 

 red ; feet pale yellow ; abdomen red, the seventh segment with the 

 sides at the apex black, the remaining segments black : in the female 

 the apex of the seventh segment has a point on each side ; wings 

 hyaline, pterostigma rhomboidal fuscous. Length 26-22 millim. ; 

 alar expanse 31-27 millim. 



Hob.: U. S. Illinois, Pennsylvania, Maine, Mass. and Southward. 



A. THASTATUM, Say. — A. ANOMALTJM, Bumbur. 

 Brassy-green, varied with orange and yellow ; head brassy-green in 

 front, with an orange occipital point at each side ; prothorax with the 

 posterior lobe somewhat produced in the middle ; dorsum of the 



4 



