248 ENTOMOLOGICAL NEWS. [June, '17 



Aeolagrion dorsale Burmeister. (Type of the genus). (Plate 



XYII. figs. 5 and 6; Plate XVIII, fig. 21). 



Abdomen $ 27-30, average 28.3, .$ 27-28; hind wing S 17-19. aver- 

 age 17.7, $ 18-19. 



S. — Genae light bluish green, very pale, to bright bluish green; 

 labrum brown to shining black ; rhinarium and nasus bluish green, 

 light and bright in older specimens, the nasus with a little dark or 

 black at base; frons in front bluish green below on the lateral margins, 

 remainder orange or rust brown to dark reddish brown and, in ex- 

 treme cases, black. Head above metallic green to black, a short orange 

 line from the lateral ocellus outward and forward toward the antenna, 

 reaching a little more than half the distance. Rear of head upper half 

 black, lower half very pale bluish to pale greenish. 



Prothorax with the front lobe blue, broadly black posteriorly but not 

 reaching the lateral margins; middle lobe blue, black above, narrow 

 anteriorly, widening rapidly posteriorly where it occupies the full 

 width of the lobe ; hind lobe black dorsally with a continuation of the 

 middorsal thoracic stripe, sides bhae. Hind lobe laterally winged, the 

 median portion greatly developed in a dorsally directed triangular 

 plate, more than twice as high as the wings, the apex acute, the sides 

 convex. Propleuron pale, bluish above to entirely blue. In very ma- 

 ture specimens the blue of the prothorax is more or less overlaid with 

 silvery white. 



Dorsum of thorax its entire length broadly metallic green to black, 

 the stripe gradually narrowed at either end, bordered on either side by 

 a blue stripe, scarcely half as wide, which reaches the humeral suture; 

 a narrow brown or black posthumeral stripe which is continued across 

 the mesinfraepisternum and which shades out into the rust red which 

 occupies practically all of the mesepimeron; with age the mesepimeron 

 darkens till, in extreme cases, it is entirely black except an anterior 

 superior blue spot and a small posterior inferior area which remains 

 rust red ; metepisternum and metepimeron very light blue to bright 

 blue, sometimes an indistinct dark area on the metepisternum along 

 the second lateral suture. Beneath and coxae white to pale bluish; 

 coxae externally in older specimens bright to dark blue. The antehu- 

 meral blue stripe is sometimes more or less overlaid with silvery white 

 and the same is true to a lesser extent of the blue of the sides of the 

 thorax. 



Abdomen from above black, slightly paler on 3 and 4 in younger in- 

 dividuals; a narrow apical blue ring on i, and narrow interrupted 

 basal blue rings on 3 to 7, yellowish on 7, and on all segments in 

 younger individuals; 8 and 9 bright blue, 10 black. Seen from the side, 

 I and 2 blue with a narrow dark apical border; 3 to 6, or 3 to 7 in 

 younger specimens, with sides below yellowish or greenish, connected 

 with the basal rings, and slightly widening subapically, the black of the 



