328 COSTA RICAN EPIGOMPHUS (oDONATa) 



Third femora reaching but little farther back than the first abdominal 

 segment, armed with spines shorter than the thickness of the femur. 



Front wings with M4 (short sector) and Cul (first sector of the triangle) 

 divergent, with ten to seventeen marginal cells between them; proximal angle of 

 the discoidal triangle as far (or farther) distad from the arculus as (or than) 

 the length of the proximal side of the internal triangle. 



All wings without a brace-vein at the proximal end of the pterostigma. 



Arculus of the front wings distal to the second antenodal at least of the sub- 

 costal series. 



Cubito-anal cross- veins, including the anal crossing (submedian cross- 

 veins), on the front wings two or more. 



Males with the abdomen widest at segment ten, except in E. llama where 

 segments eight to ten are equally wide; third femora with more numerous 

 shorter spines on the flexor surface than in the female (cf. Plate XIV, figs. 

 11 and 12); third tibiae and first two joints of third tarsi with the spines of 

 the antero-inferior (outer) row much shorter than those of the postero- 

 inferior row and blunt at tip (cf. PI XIV, figs. 14, 19); no ansl triangle. 



Females with the auricles on abdominal segment two, well developed;' third 

 tibiae and third tarsi with the two rows of spines similar, slender, acute {cf,^- 

 PI. XIV, figs. 13, 18). 



Variations have been noted in the following characters: 



Internal triangle of the hind wings free 99.31 %, with one cross-vein (1 

 wing) .69 %. 



Discoidal triangle of the hind wings free 97.92 %, with one cross-vein 

 (1 wing) .69 %, with two cross-veins (2 wings) 1.39 %. 



Supratriangular cross-veins on the front wings absent 92.37 %, one (11 

 wings) 7.63 %; on the liind wings absent 97.92 % one (3 wings) 2.08 %. 



Sectors of the arculus on the front wings separated by an interval less than 

 the thickness of either sector 97.92 %, on the hind wings the same; with no 

 interval between them, i. e., contiguous (two front and two hind wings), 

 1.39 % each; with interval between them greater than the thickness of either 

 sector (1 front, 1 hind wing) .69 % each. 



Basal subcostal cross-veins on the front wings one 97.92 %, two (three 

 wings) 2.08 %;i'' on the hind wings one 96.53 %, two (two wings) 1.39 %, 

 absent (three wings) 2.08 %. 



i-The statements for the third tarsi of males and of females are based on 

 the present material, E. paludosus 1 d', E. llama 4 cf 3 9 . The shorter 

 spines of the antero-inferior row of the tibia and tarsus of llama cT are sud- 

 denly contracted near their tips into acute apices much as shown in Ent. 

 News, XIV. ])1. viii. fig. 11 for subobtusus. 



I'What may be described as a basal costal cross-vein exists on both front 

 wings of a female of E. subsimilis; it is an wnthickened antenodal proximal 

 to the normal thickened first antenodal, not continuous with any cross-vein 

 in the subcostal sjiace but slightly distal to the level of the normal subcostal 

 cross-vein. 



