MATERIALS FOR A FAUNA CANADENSIS. 453 



ern'var. the sides of the thorax fuscous with two interrupted yellow 

 lines on each side : all the wings of the male with a basal fuscous 

 point. Length 23 millim. ; alar expanse 36 millira. ; pterostigma 

 2 millim. 



Sah.: U. S. as far north as the States of N. Y. and Mass. 



b. Diplax, Charpentier. Posterior lobe of the prothorax large, broad, 

 bilobed ; abdomen a little shorter than the wings, slender, tri- 

 quetral, compressed at the base ; feet long, slender ; first sector 

 of triangle sinuated ; triangle moderate, broad. 



L. HuDSONiCA, Seli/s. Very near to the European L. duUa (which 

 is thus described : L. duhia, black ; front white, labium black, labrum 

 white, margined with black ; vertex and band before the eyes black ; 

 thorax obscure brassy-green, with brown villosity ; dorsum with a 

 subinterrupted fulvous stripe on each side ; sides spotted with fulvous ; 

 feet black ; abdomen slender, triquetral, the dorsum spotted with yel- 

 low ; wings hyaline or fumose, anterior pair with two basal points, 

 posterior with a point and a triangular spot at the base, black ; pteros- 

 tigma quadrangular ; nigro-fuscous. Length 37 millim. ; alar ex- 

 panse 58 millim. ; pterostigma 2 millim. 



ELudsonica is smaller ; the basal spot of the posterior wings small ; 

 the vortex yellow above ; the labrum scarcely margined with black. 

 Length 27 millim. ; alar expanse 46 millim. 



Hab. : Hudson's Bay, New Brunswick. 



L. INTACTA. — Diplax intacta, Hagen. 



Fuscous ; mouth and front white ; labium of adult male all black, 

 of fern, black in the middle ; front with a black band before the eyes ; 

 vertex black, with a pale spot, or all black ; thorax nigro-fuscous ; 

 dorsum with obsolete fulvous stripe on each side ; sides fuscous, va- 

 ried with black ; thorax of adult male brassy-black ; abdomen short, 

 somewhat broader before the apex ; fuscous, with dorsal phalarate 

 fulvous spots : in the adult male black, with a yellowish spot on 7th 

 segment ; wings hyaline, posterior ones at the base with a triangular 

 black spot ; base flavescent in the females ; pterostigma short, quad- 

 rangular, black. Length 32 millim. ; alar expansion 52 millim. ; 

 pterostigma 2 millim. 



Hah.: U. S. Wisconsin, Chicago, Mass. 



