MATERIALS FOR A FAUNA CANADENSIS. 4US 



d. Libellula, Hagen. — Posterior lobe of prothorax small, enti)-e ; ab- 



domen stout, rotundo-triquetral, narrowing posteriorly ; triangle 

 narrow, long, first sector sinuated, 



L. QUADRIMACULATA, Linn. 

 Reddish yellow, villose ; front pale, terminated with black ; sides of 

 thorax yellow, lineated with black ; feet black ; abdomen attenuated 

 at the apex ; fuscous behind ; sides yellow ; wings yellow at the base 

 anteriorly, a costal spot, and sometimes an apical one; posterior wings 

 with a triangular spot at the base, reddish black, veined with yellow ; 

 pterostigma brownish black. Length 48 millim. ; alar expanse 80 

 millim. ; pterostigma 4 millim. 

 Hab.: Northern U. S. ; Canada. 



e. Plathemis, Haf/en. — Posterior lobe of prothorax small, entire ; ab- 



domen short, broad, depressed ; legs stout, short ; pterostigma 

 long, oblong ; front sector of triangle sinuated ; triangle narrow, 

 long ; eighth segment in the female dilated at the sides. 

 L. TRiMACULATA, De Geer. — Plathemis trtmac. Hagen. 

 Rufescent ; thorax with two oblique yellowish stripes at each side ; 

 abdomen of the male pruinose ; female with lateral obb'que yellow 

 spots, margined with fuscous ; feet black ; base of the femora rufes- 

 cent ; wings hyaline, a basal, longitudinal stripe, which is margined 

 inferiorly with lacteons on the posterior wings and a broad band in 

 the middle, in the male ; or with the basal stri{)es a spot upon the 

 middle anteriorly, and the apex fuscous in the female ; pterostigma 

 fuscous. Length 40 millim . ; alar expanse 70 millim.; pterostigma 

 5 millim. 



Hah. : U. S. widely diffused, reaching to Maine and Minnesota. 



CoEDULiA, Leach. 



C. SEPTENTRioNALis, Hagen. 

 Brassy-green, hairy ; labium luteous ; front brassy-green above, 

 each side with a yellow spot ; vertex brassy -green ; thorax brassy- 

 green, the dorsum having a spot at each side at the wings, and the 

 sides each two maculose stripes, yellow*; feet black, anterior femora 

 yellowish at the base; abdomen slender, behind the base inflated; 

 then attenuated, with the apex equal, brassy-black, sides of the base 

 and apex luteous ; wings hyaline, the posterior ones with a small basal 

 triangular brownish-black spot ; pterostigma small, fulvous ; anal 



