THE SUBFAMILY LIBELLULIN^. 325 



pleura, above the middle pair of legs. Abdomen with the sides nearly parallel in both 

 sexes, with dorsal and clateral arinse, and transverse carinse on segments 2-4, brown, 

 the dorsal and sometimes the lateral carinae black, the first and ninth segments black 

 above, and the others with a broad black stripe on each side above, only divided by 

 the sutures and the transverse carinae ; appendages short, reddish in the male, black in 

 the female. Wings yellow, with brown and light yellow nervures, pterostigma reddish 

 brown ; fore wings with more or fewer of the cells between the base and the level of the 

 nodus, except along the costa and about the triangle, snbhyaline ; above the triangle, and 

 sometimes touching its upper and outer angle, is a brown blotch, varying in size, but 

 not extending to the costa, and one cell beyond the nodus is a transverse brown band, 

 with a projection inwards below the costal areas, and extending across the wing to the 

 inner margin ; hind wings yellow, the cells at the base, and sometimes some of those 

 below the subcostal nervure, hyaline ; lower antenodal costal space between the first and 

 last nervure more or less brown, and an irregular brown band descends from this across 

 the triangle, then growing narrower, and almost interrupted in the middle of the wing, 

 and then widening, and turning inwards towards the anal angle, which it does not 

 reach ;. just beyond the nodus is a transverse band nearly as on the fore wings, but 

 rather broader, and a little expanded basally where it strikes the hind margin ; the 

 apical third of the wing is hyaline, but with a narrow brown border, extending from 

 the yellow part of the wing round the tip nearly to the pterostigma. Membranule 

 very small, white at the base and black on the outside. Fore wings with 8-9 antenodal 

 and 6 postnodal nervures, triangle oblique, not traversed, followed by two rows of cells, 

 subl.riangular space consisting of two cells ; sectors of the arculus hardly stalked ; 

 hind wings with the triangle generally traversed. 



Hab. Para. 



In one female, perhaps more adult than the others, the wings are only slightly 

 vitreous in the basal cells, and the brown border of the hind wings is absent, though 

 the whole apex is rather darker than the rest of the wing. Unfortunately this speci- 

 men is without locality. 



This species, notwithstanding its resemblance to Libellula lais, Perty, is very distinct 

 in neuration, and agrees in all essential characters with the true Perithemis domitia, 

 Drury (probably =metella, Selys, but apparently quite distinct from the various North- 

 American species which have been regarded as synonymous with domitia by Selys and 

 Hagen). Drury's figure was taken from a Jamaican specimen, and although it is 

 rough, and probably represents too many costal nervures, the subtriangular space of 

 the fore wings is distinctly represented as consisting of two cells. I regard a male in 

 the British Museum, from St. Domingo, as probably Drury's species (7 antenodal and 

 5 postnodal nervures). Another specimen, without head, and with no locality label, 

 may be the female; the abdomen is cylindrical and subparallel, and the wings are 

 yellow from the base to beyond the nodus, and on the upper costal spaces to the 



