THE SUBFAMILY LIBBLLULIN^. 305 



triangle widely separated at their origin: anal appendages of male rather short; legs 

 stout, moderately long, femora serrated, with one to three long spines at the extremity, 

 hind tibiae with about seven pairs of long, straight spines. 

 Type Libellula peruviana, Ramb. 



Genus 70. Pachtdiplas. 

 Brauer, Verh. zool.-bot. Ges. Wien, xviii. pp. 368, 722 (1868). 



Frontal tubercle raised, truncated ; eyes contiguous ; abdomen moderately stout, as 

 long as the hind wings, of nearly equal breadth throughout, segments 2 and 3 cari- 

 nated, 4 indistinctly, segment 8 not perfoliate in female: pterostigma rather long; 

 fore wings with 6 antenodal and 5-6 postnodal nervures, the last antenodal always 

 continuous, the first two postnodals not so, cells of the costal area simple, triangle 

 rather broad, traversed, on a level with that of the hind wings, followed by three rows 

 of cells, no supratriangular nervures, subtriangular space consisting of three cells, 

 sectors of the arculus stalked, gradually curved, lower basal cell with one cross 

 nervure, nodal and subnodal nervures continuous, the nodal sector undulating, espe- 

 cially at the base, the intermediate cells only bisected towards the hind margin; hind 

 wings broader than the fore wings, with 5 antenodal and 6-7 postnodal nervures, the 

 first two or three postnodals not continuous, triangle rather long, free, followed by two 

 rows of cells, no supratriangular nervure, one cross nervure in the lower basal cell, 

 sectors of the triangle more or less separated : anal appendages of the male moderate, 

 pointed. 



Type Lihellula longipennis, Burm. 



Genus 71. Canxaphila, g. n. 



Frontal tubercle bifid ; eyes contiguous ; abdomen moderately stout, triquetral, 

 thickest at the base, but not remarkably, and gradually tapering, about as long as the 

 hind wings, segments 2 and 3 carinated, 4 imperfectly, segment 8 perfoliate in female : 

 wings rather narrow, moderately' long, pterostigma long; fore wings with 13-15 ante- 

 nodal and 9-10 postnodal nervures, the first three postnodals not continuous, cells of the 

 postnodal area sometimes bisected on the hind margin, triangle rather small, placed just 

 oeyond that of the hind wings, traversed, followed by two rows of cells increasing, or 

 the first row of three, and then a series of two, one supratriangular nervure sometimes 

 present, one or two cross nervures in the lower basal cell, subtriangular space consisting 

 of three cells, sectors of the arculus stalked, gradually curved, nodal sector slightly waved 

 beyond the middle, subnodal sector nearly continuous, the intermediate cells bisected 

 towards the hind margin ; hind wings rather broader than the fore wings, with 10-13 

 antenodal and 9-10 postnodal nervures, the first two or three postnodals not continuous, 

 triangle free, followed by three rows of cells (sometimes four in the first row) increasing, 

 no supratriangular nervures, two cross nervures in the lower basal cell, membranule 



VOL. XII. — PAET IX. No. 8. — August, 1889. 2 y 



