BY FREDERICK A. A. SKUSE. 667 



with microscopic pubescence ; the former with or without lateral 

 spines, and having terminal spurs, the latter furnished with weakly 

 developed ungues, the pulvilli being small, scarcely perceptible, or 

 altogether wanting. Wings longer or shorter than the abdomen, 

 incumbent, generally rounded at the base and apex, but sometimes 

 cuneiformly narrowed at the former ; microscopically haired,, 

 rarely distinctly pubescent ; ciliated round the margin ; pellucid, 

 more or less deeply tinted with different shades of brown, and 

 occasionally hyaline ; generally beautifully iridescent ; altogether 

 wanting in Upidajous. Costal vein never quite reaching the 

 apex of the wing, its termination distinct. The number of longi- 

 tudinal veins amounts to four, though often a rudimentary fifth 

 is more or less distinctly perceptible immediately behind the 

 fourth ; the third and fourth longitudinal veins furcate. First 

 and second longitudinal veins and costal vein very distinct. First 

 longitudinal vein short, joining the anterior margin either before,, 

 at, or a little beyond the middle of the costal vein, or before, over, 

 or somewhat beyond the base of the fork of the third longitudinal 

 vein. Cross-vein usually distinct, situated either before, at, or 

 beyond the middle of the first longitudinal vein. Second longi- 

 tudinal vein always terminating at some point in the margin 

 before the tip of the costal vein, seldom forming a fork near the 

 tip by sending out a short anterior branch into the costa ; that 

 portion before the ci'oss-vein nearly always running parallel to the 

 first longitudinal. Third longitudinal vein usually originating 

 about midway between the base of the second longitudinal and the 

 cross-vein ; generally pale and moi^e or less indistinct ; the petiole 

 always long, often longer than the anterior branch of the fork ; 

 branches of the fork inclined posteriorly, more or less undulated, 

 and both reaching the margin below the tip of the costal vein, the 

 tip of the anterior branch being sometimes at, but never before, 

 the apex of the wing ; the base of the fork more or less cunei- 

 form, rarely bulbous. Fourth longitudinal vein generally pale, 

 branching near the base. A distinct longitudinal wing-fold lies 

 between the fourth and rudimentary fifth longitudinal veins, much 

 nearer the former. Abdomen composed of seven segments, 



