THE SUBFAMILY LIBBLLULIN^. 315 



AnTIDTTHEMIS TE.'iMEIFORMIS. (Plate LI. fig. 4.) 

 Dythemis (?) trameiformis , Selys, MS. 



Long. Corp. 48 millim. ; exp. al. 100-110 raillim. ; long. pter. 7 millim. 



Rufous, mentum yellow, back of last three abdominal segments above, anal appen- 

 dages, and tarsi black. Wings yellowish hyaline, iridescent, more strongly tinged with 

 smoky yellow towards the tips, nervures brown or reddish ; pterostigma yellow between 

 blackish nervures ; hind wings purplish brown at the base to beyond the triangles, 

 this colour projecting at two thirds of the breadth of the wing from the costa, and 

 again upon the hind margin ; below the lower basal cell is a vitreous space in the 

 female ; in the male two vitreous spaces are visible on the right side only, one below 

 the lower basal cell, and another below tlie triangle. Anal appendages of male longer 

 than the eighth segment, slightly thickened in the middle, and pointed, the middle 

 one nearly as long as the lateral ones, those of the second segment not conspicuous, 

 the last division globular ; anal appendages of female small. 



liab. Para. 



Tramea daewini. (Plate LI. fig. 1.) 



Long. Corp. 45 millim. ; exp. al. 84 millim. ; long. pter. 3| millim. 



Female. — Greenish yellow, suture on which the frontal ocellus stands blackish ; 

 lower parts of the mouth more inclining to orange ; labrum edged below with a black 

 line ; pleura with two rather indistinct yellowish stripes. Legs dark brown, pale 

 beneath and at the base of the femora. Abdomen reddish brown, dorsal carina 

 unicolorous, lateral carina black, last three segments black, reddish on the sides at 

 the base ; anal appendages reddish brown, nearly as long as the last two segments, 

 nearly straight, slightly approximating, slender, and hairy. Wings very clear hyaline, 

 veins brown, paler towards the costa ; pterostigma yellow, enclosed by dark brown 

 nervures, rather longer on the fore wings than on the hind wings ; fore wings with 

 11-12 antenodal and 11-12 postnodal nervures, triangle rather narrow, followed by four 

 rows of cells ; hind wings with the membranule white, bordered by a narrow black line, 

 the usual opaque spot beyond unusually small, though varying a little in shape and size. 



Hob. Galapagos Islands. 



The reddish body, clear hyaline wings, and very small opaque spot on the hind wings 

 render this species very distinct from any described American Tramea. There are five 

 specimens in the British-Museum collection, but only one in fairly good condition. 



Tramea translucida. 



Long. Corp. (absque app.) 48 millim. ; exp. al. 88 millim. ; long. pter. 3 millim. 



Female. — Head pale testaceous yellow in front; frontal tubercle and occipital 

 triangle more waxen, the front of the former above the frontal ocellus reddish brown, 

 shading below into black, in front of the ocellus is a violet-black stripe ; rhinarium 



2 z 2 



