4^4 MATERIALS FOR A FAUNA CANADENSIS. 



L. RXJBicuNDULA, Sfljy.— DiPLAx EUB., Hageii. 



Yellowish subrufescent ; front yellowish, with a black band before 

 the eyes; thorax rufous, the sides sometimes luteous ; feet black; 

 anterior femora luteous beneath ; abdomen rather long, slender, san- 

 guineous in the male, or yellowish rufous ; the sides with a maculosa 

 black stripe ; wings hyaline, the extreme base yellowish ; pterostigma 

 quadrangular fuscous,, pale at each end. Length 32-37 millim. ; alar 

 expanse 50-58 millim. ; pterostigma 2 millim. 



Hob.: U. S. Mass., &c. 



L. ASSiMiLATA, XJiiler. — DiPLAx ASS., Hagen. 



Yellowish ; mouth and front pale yellow, a narrow black band be- 

 fore the eyes ; dorsum of the thorax luteous, its sides yellow ; abdo- 

 men slender, the base compressed, inflated, yellowish ; dorsum of first 

 and second segments black at the base ; segments 4-9 each side, with 

 a marginal black stripe ; wings hyaline, tbe base flavescent ; males 

 with the basal half flavescent ; pterostigma short, yellow. Length 

 33-37 mllim. ; alar expanse 56-60 millim. ; pterostigma 2|- millim. 



ILal.: U. S.— N.W. States. 



c. Mesothemis, Sagen. — Posterior lobe of prothorax large, broad, 

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

 quetral, the base compressed, somewhat expanded before the 

 apex ; feet long, ratber strong ; first sector of triangle sinuated ; 

 triange moderate narrow ; sides of eighth segment of the female 

 not dilated. 

 L. siMPLicicoLLis, Say. — Mesothemis simplicicollis, Kagen. 

 Yellowish-green ; mouth and front yellowish ; a narrow black band 

 before the eyes ; thorax yellowish green, tbe sides varied with black 

 below; abdomen compressed at the base, vesiculose, triquetral, yellowish- 

 green, tbe sutures and margins black; segments 4-10, with a quad- 

 rangular black dorsal spot behind ; last segments sometimes altogether 

 black ; venter obscure ; appendages yellow ; feet black, anterior fe- 

 mora yellowish beneath ; wings hyaline ; pertostigma oblong, yellow. 

 Adult male with tbe thorax and abdomen blue pruinose. Length 

 41-45 millim. ; alar expansion 60-70 millim. ; pterostigma 3|— 4 

 millim. 

 Hub.: U. S. as far north as Illinois, Petinsylvania, N. Y., Mass. 



