Mr. W. F. Kirby on Odonata from Sierra Leone. 73 



placed a little nearer the base of the wings than the arculus ; 

 one supratriangular nervure ; sectors of the arculus slightly 

 separated, the lower one coinciding with the baseof the triangle. 

 Abdomen with strong black median and lateral serrated carinas; 

 terminal appendages of male as long as the ninth segment, 

 the lower appendage broad, half as long as the others. 



Female. — Uniform rufo-testaceous, mouth- parts inclining 

 to yellowish, dark shoulder-stripe slightly indicated, carinas of 

 abdomen black, eighth segment perfoliate. 



This species agrees with T. madagascan'ensis, Ramb., in 

 general neuration, the bifid frontal tubercle, the Orthetrum- 

 like frontal depression, &c, but differs in the fewer and 

 stronger spines on the hind tibise. 



Described from five male specimens, one taken by 

 Mr. Austen at Sierra Leone on Sept. 21, 1899, and the others 

 from West Africa, without special locality. 



The single female is from Sierra Leone {Morgan). 



I append the description of an allied species from Angola*: — 

 Female. — Dark brown ; head testaceous ; under surface and 

 terminal segments inclining to ferruginous ; eighth segment 

 perfoliate, with the edges black. Wings yellowish hyaline, 

 with black nervures : fore wings with 19 antenodal and 12 

 postnodal cross-nervures; neuration otherwise as in T. Austeni. 

 One specimen from Angola, collected by Mr. and Mrs. 

 Monteiro. 



Thermorthemis leonina. 

 Orthetrum leoninum, Karsch, Eut. Nachr. xvii. p. 59 (1891). 



Two specimens ( $ ? ) from Sierra Leone, the male taken 

 by Mr. Austen on Sept. 2, 1899, and the female taken by 

 Dr. W. G. Clements. 



The insect is a true Thermorthemis, except that the body is 

 more slender, and the hind tibiee have fewer and stronger 

 spines than in T. inadagascariensis ; but it shares the latter 

 character with T. Austeni. In the male the triangle of the 

 fore wings is followed by four rows of cells increasing, and in 

 the female by five, shrinking to four and then again increasing. 



Apeleuthekus, gen. nov. 



Male. — Frontal tubercle strongly bifid ; front large and 

 broad, projecting beneath it to about half the width of the 

 eye, almost quadrangular, with a conspicuous median depres- 

 sion. Eyes connected for a short space. Legs rather long, 



* Thermorthemis Monteiroi, sp. a. 



