Vol. XXvii] ENTOMOLOGICAL NEWS. 349 



On Certain Acanthagrions, Including Three New 



Species (Odonata). 



By E. B. WILLIAMSON, Bluffton, Indiana. 



(Continued from page 324.) 



Acanthagrion apicale Selys. 



Abdomen: $, 28-30; average, 29; hind wing $, 19-20; average, 

 19.8 mm. 



$ . Face in front orange, the genae paler, yellow. Labrum 

 with median posterior impressed spot, extreme posterior edge and 

 posterior lateral border, black or dark brown. Black on nasus variable, 

 in palest specimens a small quadrangular black spot near the anterior 

 border on either side ; in the next darkest stage there is also a rounded 

 median spot near the anterior border between the two quadrangular 

 spots, this median spot connected or not with the black posterior to it 

 on the suture ; in still darker stages these three spots are more or less 

 connected and the exterior ends of the quadrangular spots fuse with 

 the black on the nasofrontal suture. Naso-frontal suture black, wid- 

 est in the median line. The frons in front is usually slightly darker 

 than the labrum, and rarely is obscured and much darker ; in about 

 half the specimens the black of the frons above joins the black of the 

 naso-frontal suture in the median line. Head above black, usually 

 with a small orange spot on either side of the median ocellus, and 

 more rarely with a similar spot between the apex of the second joint 

 of the antenna and the eye ; postocular spots orange, orange red, or 

 rarely yellow, about the size of an area enclosing the three ocelli, or 

 slightly larger. Rear of head above and surrounding the foramen, 

 black ; below pale, slightly yellowish-tinged or not. 



Anterior of lobe of prothorax with a large, median orange or yellow 

 spot which nearly reaches the anterior border, reaches the posterior 

 border, and is wider than long, in some cases reaching the lateral mar- 

 gins where it is more or less obscure; remainder of prothorax black. 

 Propleuron largely brown, black above, the adjoining brown orange- 

 tinged. 



Thorax above black with an orange or orange red antehumeral 

 stripe, slightly wider below and as wide as, or a little wider than half 

 the black mid-dorsal stripe, which latter stripe is about equal in width 

 to the black humeral stripe, which extends broadly across the mesin- 

 fraepisternum, leaving only the lower corner of the latter brown. A 

 short black spur on the first lateral suture above, broadly joined above 

 with the humeral stripe, and narrowly joined with a broad stripe about 

 half as wide as the humeral, just in front of and parallel to the sec- 

 ond lateral suture, this stripe narrowed above, where it overlaps the 

 suture, and continued narrowly along the wing margin nearly across 

 the metepimeron ; below it does not quite reach the metastigma. Mese- 



