DIOPTIS. 291 



hind wings, and most often beyond them. Hind tibiae with four 

 spurs of various length, very rarely with two spurs. Wings mostly 

 limpid, generally long and narrow, broad in some species. 



Group Euagra. 

 Euagra Walker, 323. 



Body cylindrical, slender, linear, rather long. Palpi ascending, 

 as long as the head ; third joint conical, very small, about one- 

 sixth of the length of the second. Antennae minutely pectinated 

 to seven-eighths of the length in the male, simple in the female. 

 Abdomen extending from one-fourth to one-half its length beyond 

 the abdomen. Legs slender ; fore tibiae not dentated ; hind tibiae 

 with four moderately long spurs. Wings rather long and narrow. 



1. D. hcemanthus Walker, 324. 



Bright blue. Prothorax beneath and head clothed with crimson 

 hairs. Head white in front. Palpi crimson towards the base. 

 Abdomen and legs white beneath. Abdomen with a tuft of black 

 hairs at the tip ; sexual appendages large, testaceous. Wings 

 deep black, blue towards the base. Fore wings with an oblique 

 elongato-triangular white hyaline band in the disk beyond the 

 middle; this band is attenuated towards the hind border and 

 approaches nearer to it than to the fore border, and contains no 

 apparent veins. Hind wings with a narrow white hyaline discal 

 stripe which extends from the base nearly to the hind border and 

 is traversed obliquely by a black vein near its tip. Length of the 

 body 5 lines ; of the wings 15 lines. 



Mexico. 



Walker. 



Group Hyrmina. 



Hyrmina Walker, 331. 



Body cylindrical, linear, very slender, rather long. Palpi 

 ascending, curved, shorter than the head ; third joint pointed, not 

 one-fourth of the length of the second. Antennas of the male 

 rather deeply, of the female minutely, pectinated. Abdomen ex- 

 tending a little beyond the hind wings of the male, and nearly as 

 far as them in the female. Legs slender; fore tibiae of the male 

 slightly channelled and not dentated beneath ; hind tibiae with four 



