THE SUBFAMILY LIBELLULIN^. 283 



Genus 32. ^Ethrl-uiaxta, g. n. 

 (Plate LIII. fig. 3.) 



Frontal tubercle convex ; eyes contiguous ; abdomen broad, depressed, shorter than 

 the hind wings, not thickened at the base, but broadest in the middle, segments 2 and 

 3 carinated : wings short, pterostigma moderate ; fore wings \vith 6 antenodal and 5 

 postnodal nervures, the first two postnodals not continuous, cells of the postnodal area 

 simple, triangle very broad, on a level with that of the hind wings, free, the base 

 straight, forming a right angle with the inner side, followed by two rows of cells, then 

 three, and four on the hind margin, no supratriangular nervures, one cross nervure in 

 the lower basal cell, subtriangular space consisting of one cell, sectors of the arculus 

 rising from a point, the lower sector rather irregular beyond the middle, nodal sector 

 waved at the base only, subnodal sector nearly straight, the intermediate cells only 

 bisected close to the hind margin ; hind wings slightly broader than the fore wings, 

 with 5 antenodal and 5 postnodal nervures, the first two postnodals not continuous, 

 triangle large, free, its base coinciding with the arculus, but (as is likewise the case in 

 the fore wings) the lower sector of the arculus falls a little beyond its outer angle, it 

 is followed by two or three cells, first decreasing and then increasing, no supratri- 

 angular nervures, one cross nervure in the lower basal cell, sectors of the triangle hardly 

 separated : anal appendages of the male hardly longer than the ninth segment, the 

 lower appendage nearly as long as the others; appendages of the second segment 

 conspicuous. 



Type Lihellula brevqjennis, Ramb. 



Genus 33. Ephidatia, g. n. 



Allied to Macrotkemis, but with some resemblance to the Corduliinee. Thorax and 

 abdomen rather slender ; abdomen with lateral carinoe on segments 2 and 3, the dorsal 

 carina but slightly marked : fore wings with 7-9 antenodal and 5-6 postnodal 

 nervures, the first antenodal and the first 2 or 3 postnodals not continuous, no supra- 

 triangular nervures, discoidal cell wide, empty, followed by two rows of cells, one 

 very large pentagonal subtriangular cell, nodal sector slightly waved, sectors of the 

 arculus rising from a point on the fore wings and stalked on the hind wings, the lower 

 sector of the arculus broken and undulating beyond the middle ; hind wings with 5-6 

 antenodal and postnodal cells, the first two postnodals not continuous, the triangle free, 

 followed by two cells increasing, sectors of the triangle of the hind wings united at 

 base : legs, especially the tibise, long and slender, spines moderate. 



Type Erythemis hngipes. Hag. Ephidatia will also include Macroviia cubensis, 

 Scudd., and possibly some other named American species. The type oi Erythemis is 

 fixed by the " narrow triangle " which Hagen mentions, as E. bicolor, Erichs. 



Note. — This genus should be placed after Macrotheniis on p. 297. 



2t2 



