June, '03] ENTOMOLOGICAL NEWS. 187 



ginal cells between the short sector and the first sector of the 

 triangle (92.3). Hind icings : first and sixth or seventh ante- 

 cubitals thicker (9^.2), at most four, often only three, rows of 

 cells between the second sector of the triangle and the hind 

 margin (96.2), no anal triangle (ioo\ Head (viewed from in 

 front) : inferior angle of the triangle formed by the three ocelli 

 about 90 (100). Abdomen : loth segment widest, or 8-10 

 of equal width in E. llama n. sp. Tibia-: antero-inferior 

 row of spines on the third tibiae of the males much shorter 

 than those of the postero-inferior row and blunt at the tip. 

 Auricles on the second abdominal segment well developed in 

 both sexes. 



The differentiation in certain tibial spines, above stated, con- 

 stitutes a secondary sexual character hitherto unnoticed. 

 Stages in the differentiation are shown in PI. viii, figs, n 

 and 10. 



SYNOPSIS OF SPECIES OF Epigomphus. 



\ i. One pale green anlehumeral stripe and a more posterior superior 

 pale green antehumeral spot, the latter representing the upper 

 end of the second antehumeral stripe of |II. 



Males. 



loth abdom. seg. with a dorsal tubercle about one-third as high as the 



segment itself, spinulose at tip. 



Dorsal tubercle of 10 somewhat elongated transversely and divided 

 by a shallow median emargination into right and left halves. 

 Superior appendages slightly longer than 10, outer and inner 

 edges slightly convergent in dorsal view ; in profile view the 

 upper and lower edges diverging to two-thirds the length of 

 the appendage at which point the lower edge slants obliquely 

 upward to form the moderately acute apex. Inferior append- 

 age one and one-half times as long as the superiors, widely bifid 

 in its apical three-fourths, its branches more divaricate than 

 the superiors, each branch with a superior tooth at three- 

 fourths the length of the appendage (just beyond the level of 

 the tips of the superiors), and terminating in a backwardly 

 (caudad), inwardly (mesad) and downwardly (ventrad) trunca- 

 ted apex bearing a dense tuft of hairs paludosus. 



Dorsal tubercle of lonot elongated transversely, nor emarginate at 

 tip. Superior appendages about twice as long as 10, gradually 

 tapering to the obtuse apex which is curved downward and 



