342 IIE. W. F. KIRBY — A EEA^SION OF 



yellow spot on the lower part of the sides, above the appendages, which are not 

 conspicuous, segment 3 with a pale band, broader on the back, in front of the carina, 

 and a large oval spot on the back behind, segment 4 with a similar band before the 

 carina, the upper part behind it entirely pale, except a black spot on each side behind 

 the carina, segments 5 and 6 are pale above, but thei'e is a black longitudinal spot on 

 the suture of the 4th and 5th segments, towards the end of segment 5 a black stripe 

 commences, and gradually broadens till it covers the whole extremity of segment 6 ; 

 the remaining segments are entirely black, as well as the under surface below the 

 lateral carinse, except for the spots on the two first segments, the basal bands on the 

 3rd and 4th, and a large spot on each side of the 5th and 6th : anal appendages 

 slender, pointed, as long as the ninth segment, black, yellow above, except at the tips ; 

 lower appendage rather shorter than the others, black, raised at the tip. Legs black, 

 slender ; tibiae with double rows of slender spines. Wings clear hyaline, the extreme 

 base of the hind wings smoky brown ; pterostigma yellow, between black nervures; 

 fore wings with 9 antenodal and 8 postnodal nervures, the last antenodal and the first 

 two postnodals not continuous ; triangle moderate, open, followed by two rows of 

 cells ; lower subtriangular space consisting of three cells (one in all the other species, 

 except the typical A. ascalajj/ioides, in which it is divided by a curved line as in 



Hab. Congo. 



Tetrathemis htalina. (Neuration, Plate LVI. fig. 8.) 



Long. Corp. 26 millim. ; exp. al. 45 millim. ; long. pter. 2 millim. 



Male. — Black ; head with the front and vertex coppery green ; face yellow, the 

 rhinarium reddish ; back of the head shining black, with a transverse yellow spot 

 above the neck. Thorax coppery green above ; collar and some small spots before and 

 between the wings yellow ; the sides and under surface yellow, with two broad dark 

 cupreous bands (almost black in some lights) on the sutures. Legs black; coxse 

 and under surface of the femora yellow ; behind the legs is a thick, short, transverse 

 black stripe, followed by a crescent, behind which is again a black spot. Abdomen 

 with the sides of segments 1-6 spotted with yellow, the spots constantly diminishing 

 in size, and a small longitudinal yellow spot on the back of segment 7, segment 2 

 thickened; anal appendages rather longer and more pointed than in T.flavescens. 

 Wings clear hyaline, very slightly tinged with yellow in some of the cells at the base ; 

 pterostigma black, lower basal cell with 1 cross nervure on the fore wings and 2 on 

 the hind wings; fore wings with 8 antenodal and 5-6 postnodal nervures, the first 

 postnodal not continuous; hind wings with 7 antenodal and 5-6 postnodal nervures, 

 the first postnodal not continuous. 



Rah. Borneo. 



