268 ME. W. F. KIRBT— A REVISION OF 



the point where an incomplete interstitial sector enters ; hind wings opaque at base, 

 nearly twice as broad as the fore wings at the base, but rapidly narrowed towards the 

 tips, with 16-18 antenodal and 18 postnodal nervures, the first three or four postnodals 

 not continuous, triangle rather long, divided by three cross nervures (one of them 

 cutting off the lower basal angle) into four cells, and followed by four or five cells, a 

 supratriangular nervure sometimes present, sectors of the triangle rising from a point, 

 lower basal cell with two cross nervures : anal appendages in male rather long. 

 Type Dythemis {%) trameiformis, Selys, MS. 



Genus 6. Tramea. 

 (Plate LI. fig. 1.) 

 Hagen, Neur. N. Amer. p. 143 (I860); Brauer, Verb, zool.-bot. Ges. Wien, xviii. pp. 364, 713 

 (1868). 



Eyes connected by a short space in front, frontal tubercle broad, very slightly 

 grooved in the middle ; abdomen moderately slender, distinctly shorter than the hind 

 wings, segments 2 and 3 slightly thickened, and 4 and 5 slightly contracted, basal and 

 lateral carinse distinct, though not strongly marked, segments 2, 3, and 4 transversely 

 carinated, segment 8 not perfoliate in female : wings long, rather pointed, pterostigma 

 moderate; fore wings with 11-13 antenodal and 9-11 postnodal nervures, the last 

 antenodal and the first two or three postnodals not continuous, cells of the lower post- 

 nodal space simple, triangle generally rather long and narrow, placed considerably 

 beyond the plane of that of the hind wings, traversed by one or two cross nervures, 

 and followed by four rows of cells, no supratriangular nervure, and only one cross 

 nervure in the lower basal cell, subtriangular space consisting of five or six cells, sectors 

 of the arculus stalked, curved, and the lower one often a little irregular at the extre- 

 mity, nodal sector not waved or broken, subnodal sector broken towards the extremity ; 

 hind wings much broader than the fore wings at the base, with 6 or 7 antenodal and 

 12-13 postnodal nervures, the last antenodal continuous, and the first two postnodals 

 not so, triangle free, followed by three or four rows of cells, an opaque reticulated 

 space at the base of the hind wings, one cross nervure in the lower basal cell, sectors of 

 the triangle united at base : anal appendages rather long. 



Type Lihellula Carolina, Linn. 



Genus 7. Taueiphila, g. n. 

 Allied to Tramea; abdomen rather broader, and with only segments 2 and 3 trans- 

 versely carinated: wings long, pterostigma moderate; fore wings with 11-14 antenodal 

 and 8-9 postnodal nervures, the last antenodal and the first two or three postnodals not 

 continuous, triangle traversed by one nervure, and followed by three rows of cells, 

 subtriangular space consisting of three or four cells, subnodal sector and lower sector 



