290 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



of hind wings: Male, 20-23; average, 21.7; female, 22-24; average, 

 23.3. 



Male. — Robust, both thorax and abdomen. Legs compared with 

 emma short and weak, the last femora barely reaching the first abdom- 

 inal segment. Wings relatively shorter than in the female but not 

 noticeably narrower; hyaline but not as steely as in emma males. 

 Stigmas variable; among 20 males the stigmas of the front wings in 

 11 surmount one cell; in 2 individuals the stigma surmounts 2 cells 

 in one front wing and one cell in the other front wing; in 7 indi- 

 viduals the stigmas surmount variously from 1| to If cells. The 

 same variation shows in the stigmas of the hind wings. Among 20 

 males tabulated the usual number of antenodal cells was 4 in each 

 fore Aving and 3 in each hind wing. Variations of one or two occurred 

 either way. The average in the 20 males was right fore wing 4, left 

 fore wing 3.8, right liind wing 3.1, and left hind wing 3.1. 



In the second segment of the abdomen (see figs. 52 and 53) the ventral 

 limb of the anterior hamule is tliicker anteriorly, and about a third of its 

 length back of the anterior end this thickness forms an obscure ridge de- 

 current dorsad on the base of the hamule. Viewed ventrally the pos- 

 terior hamules are more pointed than in emma. The ventral hmb of 

 the chitinous shaft of the penis has on its ventral surface at the anterior 

 end a ridge, which widens cephalad; the posterior third of the ventral 

 limb is slightly narrower than the anterior two-thirds. The second 

 joint of the penis extends caudad from the distal end of the basal joint 

 or shaft; it is fleshy and widens caudad, and when viewed laterally is 

 seen to be variously folded and ridged. The third or terminal segment 

 runs cephalad ; it is supported by two chitinous longitudinal ribs, and 

 consists of an almost quadrangular proximal lobe, occupying two- 

 thirds of its length, each outer distal angle of which is indented on its 

 lateral face, and a distal or terminal elUptic lobe. The lateral walls of 

 the genital fossa when viewed from the side are extended more 

 abruptly ventrad in their posterior half than in emma. 



Segment 10 deeply and widely indented on the dorso-median Une of 

 the posterior end, with a low keel on either side of this indentation. (See 

 figs. 45-47 .) The superior appendages two-thirds the length of the in- 

 ferior; when viewed from above, widening caudad and abruptly trun- 

 cate, the posterior end appearing impressed. Wlien viewed from behind 

 it is seen that this impressed area is produced ventrad and shghtly cau- 

 dad into a single median tooth. When viewed from the side the dorsal 

 and ventral edges are seen to be subparallel, and the ventro-posterior 

 tooth appeal's in profile extending ventrad and in some specimens 

 shghtly caudad. Each inferior appendage has a lateral and a terminal 

 branch which are subcqual. When viewed from above the terminal 

 lobe is seen to bo obtusely jjointod and wlicn viewed from below it is 

 seen to be decurrent along the inner edge of the appendage as an 



