124 Mr. W. F. Kirby on a ntw Dragonfly. 



hope that the above short description will be sufficient for the 

 identification of the species. 



A single female specimen of Prionocnemis verruciferus^ 

 Karsch, or of a closely allied species, was received from 

 Mombasa at the same time as the specimens of Eugaster 

 frater. Karsch's species was described from a single male 

 specimen, and although the sexes of the Hetrodidee differ 

 little, I await further specimens before describing an insect 

 which does not quite agree with his description, but which 

 is of a different sex. 



As the genus Prionocnemis^ Karsch, is preoccupied, I 

 propose to rename it Madiga. 



The Hetrodidai appear to be very numerous in Africa, and 

 no doubt many species still remain to be discovered. 



XVII. — On a new Dragonfly captured hy Mr. Scott Elliot in 

 East Africa. By W. F. Kirby, F.L.S., F.E.S., &c.. 

 Assistant in Zoological Department, British Museum, 



jEschna Ellioti. 



Long. corp. 58-60 raillim. ; exp. al. 70-75 millim. ; long. 

 pter. 3 raillim. ; long. app. 4 millim. 



Male. — Rufous brown. Face yellowish green, vertex ru- 

 gose, space around the ocelli blackish. Thorax with two 

 broad converging green bands above and the septa green ; 

 two oblique green bands on each side under the wings, 

 central markings of the interalary space above, and the base 

 of the wings spotted with green ; abdomen inflated at the base 

 and constricted beyond, with a short lateral green band, 

 bordered behind with black, at the extremity of the first 

 segment ; segments 2 to 8 of abdomen with a black transverse 

 carina, in the middle at first, then gradually nearer the front 

 margin ; segments 3 to 10 with a large greenish spot at the 

 extremity, on each side of the longitudinal carina; the space 

 in front of the transverse carina is also paler on most of the 

 hinder segments. Lateral appendages not expanded, deeply 

 grooved above, and slightly hairy ; lower appendage sub- 

 triangular, less than one third the length of the others. Legs 

 black, reddish towards the base. Wings hyaline; pterostigma 

 rather short, covering a little more than two cells : fore wings 

 with 14 or 15 antenodal and 9 or lOpostnodal cross-nervures, 

 triangle consisting of 3 cells ; 2 supratriangular neivures ; 



