230 PROCEEDINGS OF THE ACADEMY OF [1899. 



carina, but the meeting of the two colors violet and brown nearly 

 coincides with a more or less angular crest, best marked on the 

 anterior surface. Hind lobe of the prothorax much smaller than 

 the middle lobe, its hind margin entire. 



Sjoiues on all the femora directed toward the knee, 6 on the first, 

 9-12 on the second, 20-18 on the third; the spines on the third 

 femora are shorter than the intervals separating them and notice- 

 ably shorter than the spines on the first or second femora; all these 

 spines are of the antero-inferior (or outer) row, the postero-infe- 

 rior row being composed of more numerous, slender hairs. Third 

 tibiffi with 12 antero-inferior (outer), 15 postero -inferior (inner) 

 spines, longer than the intervals separating them. Claws of all 

 the tarsi with the tooth distinctly shorter than the tip of the nail 

 itself. 



Abdomen, viewed from above, widest at 2 and at 6, slightly nar- 

 rower at 3 and at 10. Genitalia of 2 quite prominent, especially 

 the hamule which is entire, sickle -shaped, resembling, but more 

 robust than, that of Macrotheiim. Anterior lamina but little less 

 prominent; viewed in profile, convex and polished in front, nearly 

 plane behind; seen from behind its apical fifth is very distinctly 

 bifid so as to show two tapering, rounded tips. Genital lobe at least 

 half shorter than the hamule, oblong, apex rounded. 



Superior appendages as long as 9, of the usual Libelluline form, 

 with an inferior row of 8-10 denticles. Inferior appendage aliout 

 one- seventh shorter, triangular, reaching beyond the denticles of 

 the superiors. 



Wings slightly smoky, milky at base to the arculus on the front 

 wings, to the triangle on the hind wings. Pterostigma dark 

 brown. Membrauule pale brown, white at extreme base. Reticu- 

 lation throughout blackish ; nodal sector distinctly waved ; two 

 rows of cells between the subnodal sector and the next supplement- 

 ary sector below; one submedian cross-vein; arculus between the 

 first and second antenodals. 



Front Avings: 14 (right), 13 (left) antenodals, the last not con- 

 tinuous; 9 (right), 10 (left) postuodals, the first three not contin- 

 uous; discoidal triangle with one cross-vein, internal triangle of 

 three cells, three posttriangular rows to beyond the level of the 

 nodus increasing to 4-5 marginal cells. 



Hind wings: 9 antenodals, 11 (right), 9 (left) postuodals, 



