PLECTROMYIA. 283 



the spurs are so minute as to be perceptible only with great diffi- 

 culty ; the ungues are very minute ; the empodia distinct ; the 

 first joint of the tarsi is about equal in length to the tibia, or 

 even longer (on the foremost pair of the feet) ; the four following 

 joints, taken together, are a little longer than half the length of 

 the first joint. The wings (Tab. II, fig. 18) are moderately 

 broad ; the subcostal cross-vein is a little before the middle of 

 length of the wing, at a distance before the origin of the second 

 longitudinal vein equal to about two lengths of the great cross- 

 vein ; the origin of the second longitudinal vein is a little nearer 

 to the root of the wing than is the tip of the sixth longitudinal 

 vein; the prsefurca is comparatively short and arcuated. The 

 small cross-vein is opposite the tip of the sixth vein ; the second 

 submarginal cell is of the same length with the first posterior 

 cell ; the first submarginal cell is only a trifle shorter than the 

 second, as its petiole is short and in some specimens almost im- 

 perceptible ; the course of the veins, bordering these cells, is 

 straight, only the anterior branch of the second longitudinal vein 

 is somewhat arcuated ; the marginal cross-vein is at the very tip 

 of the first longitudinal vein, which tip is nearly opposite the tip 

 of the second branch of the fourth longitudinal vein ; the posterior 

 branch of the latter vein alone is forked, and hence there are only 

 four posterior cells ; the second of these (confluent with the discal 

 cell, which is open) has its basis on the same line with the small 

 cross-vein ; the third posterior cell is much shorter ; the great 

 cross-vein is about the middle of the distance between the bases 

 of the second and third posterior cells, or a little before this 

 middle ; the fifth longitudinal vein is gently arcuated towards its 

 end ; the sixth and seventh are straight. The abdomen is short 

 and comparatively stout; the male genitals are conspicuously 

 club-shaped ; the forceps consists of a pair of subcylindrical basal 

 pieces, with two horny appendages upon each ; the upper or outer 

 ones among these are rounded at the end, densely and sharply 

 serrated along the edge of the rounded part, thus looking like the 

 end of a spur ; the lower or inner appendage is more slender. 

 The ovipositor of the female is comparatively long, moderately 

 broad, arcuated. 



This genus, described here for the first time, 1 is very closely 



1 It was merely mentioned, without any description, in the synoptical 

 table of the genera which I gave in the Proc. Entom. Soc. Philad. 18G5, p. 



