Vol. XXvii] ENTOMOLOGICAL NEWS. 319 



Acanthagrion indefensum n. sp. (Plate XVII, figs. 3, 4, 7). 



Abdomen $ 23; hind wing $ I5-I5-S- 



$. Similar to kcnnedii and gracile but smaller; like kcnnedii as 

 described except as noted below ; one specimen with a large blue spot 

 on either side between the apex of the second joint of the antenna 

 and the eye, and a small obscure yellowish spot on either side just in- 

 side the first joint of the antenna, the blue postocular spots in this 

 specimen much larger than in the other specimen where they are about 

 the size of the spots in kennedii, and in both specimens the postocular 

 spots are irregular lobate in outline as contrasted with the entire out- 

 line of kcnnedii. Rear of head above, about foramen, and below adjoin 

 ing mouth parts, black, thus differing from both gracile and kcnnedii 

 which are pale below. 



Prothorax black, thus darker than in kennedii; front lobe with a 

 median bright 'blue spot. Propleuron below dull or leaden blue. 



Thoracic pattern similar to kennedii but clear blue replacing the yel- 

 low or yellowish-tinged parts of kennedii, in which character indefen- 

 sum is like gracile. The black stripe along the second lateral thoracic 

 suture is more definite and more intensely black than it ever attains in 

 gracile and as it very rarely attains in kcnnedii. 



Abdominal segment i variable ; in one specimen the dorsal black, 

 which is about as wide as in kennedii, fails to reach the apical integu- 

 ment by a distance equal to the length of this integument, that is, the 

 black is a quadrate basal spot; in the other the black is narrowed api- 

 cally, but reaches the blue integument, and there is a median blue spot 

 which is contiguous posteriorly with the integument. Sides of I and 

 2 blue, instead of green or greenish, thus again resembling gracile. 

 Remain.der of abdomen like kennedii with apical integument only of ^ 

 blue. 



Legs much darker than in gracile or kennedii', first femora entirely 

 black except the base on the inner surface ; on the second femora the 

 pale b~.sal color on the inner surface not quite reaching the middle of 

 the fc .wra; the third femora still paler, with a pale line on the an- 

 terior dorsal surface, .this pale line broader basally and disappearing 

 before the apex where the femur is completely circled with black, the 

 inner surface otherwise pale; first tibiae with anterior dorsal surface 

 black ; second and third tibiae black at base and apex ; tarsi black, 

 claws dark amber, darker than in related species, toothed as in 

 gracile. 



Wings hyaline ; stigma black, similar in shape to Kcnnedii. 



\\~ismar, British Guiana, Feb. 16, 1912, two males in my 

 collection. 



One of the specimens was sent to Dr. Calvert who writes, 

 "Most like A. gracile minanim of anything I know but ab- 



