PERITHEMIS. 185 



21. D. imbuta. 



Lihdlula imbuia Say, Journ. Acad. Philad. VIII, 32. 



J*. Abdomen red, the segments black at apex; thorax green; 

 vertex chalybeous. 



9. Abdomen greenish, segments black at the apex. 



Hab. Island of Sanipuxten, coast of Maryland. (From the 

 description of Say.) It is entirely unknown to me. 



PERITHEMIS Hagen. 



Eyes connected in a short space; posterior lobe of the pro- 

 thorax large, broad, bilobed ; abdomen much shorter than the 

 wings, broad, depressed, narrower at base ; legs moderate, slender; 

 the first, sector of the triangle hardly sinuated ; triangle moderate, 

 broad; caudal appendages short; genital organs not prominent; 

 vulva obtected ; sides of the eighth segment of the female not 

 dilated. 



1. P. domitia! 



Libellula domitia Druiy, Ins. II, 83 ; pi. xlv, fig. 4. Burm. Handb. II, 

 855, 40. Ramb.! Neuropt. 124, 132. 



Var. 1. LiheUula tenuicincta Say, Jour. Acad. Philad. YIII, 

 31, 21 ( cf j. Libellula tenera Say, Jour. Acad. Philad. YIII, 31, 

 20(9). LibelMa Mora Ramb.l Neuropt. 125, 133. Libellula 

 metella Selys, Poey Ins. Cuba, 451. 



Var. 2. Libellula iris Hagen. 



Flavescent, villose ; the sides of the thorax similarly colored : 

 dorsum of the abdomen, with an interrupted, brownish-black line 

 each side ; feet flavescent; wings flavescent (cT), or the basal half 

 flavescent, with two fuscous, transverse stripes, the internal one of 

 which is often almost absent (9); pterostigma rufo-fuscous ; mem- 

 branule cinereous. 



Var. 1. Sides of the thorax fuscous, two interrupted yellow 

 Jines each side ; all the wings of the male, with a basal, fuscous 

 point. 



Var. 2. Sides of the thorax of the same color with the remainder 

 of the body ; the wings hyaline, subflavescent, the anterior margin 

 yellow ; posterior wings of the female, with a fuscous nebula at the 



