LEGS AN"D WIXGS. 65 



lii(jhly cJiar act eristic in sliape (see Figures 12 and 13, p. 94), 

 oval and tumid, its longer axis lying in the antero-posterior 

 direction, loifh a vulviform median groove (the anus) running from 

 the anterior margin to beijond the middle. Ventral plate of the 

 sixth segment in the male, immediately in front of the hypo- 

 pygium, bearing a patch of close-set erect minute black hairs 

 no each side of the median line : ventral plates of the remaining 

 segments except the first in the male, and of all the segments 

 except the first in the female, membranous. 



Legs simple, rather long, claws longer and pulvilli somewhat 

 larger in the male than in the female. Front femora with a row 

 of bristle-like hairs above and below, and (except in the case of 

 Gl. morsitans *) on the posterior surface with a median row of 

 minute black spines. Middle and posterior femora with a row 

 (if bristle-like hairs on the basal half of the anterior surface, near 

 tlie upper margin, and with a shorter row of similar hairs, or 

 sliort bristles as the case may be, at the base beneath. Middle 

 femora with a solitary bristle, usually conspicuous in the larger 

 species, on the upper side near the tip. Tibife with a well-marked 

 ridge, edged Avith a row of closely-set minute black spines, 

 running down the outer surface, so tliat they, especially the 

 front and hind pair, usually have the appearance of being 

 somewhat flattened from side to side ; tlie middle tibiai have a 

 second row of still more minute spines in advance of that just 

 mentioned, the space between, owing to the presence of the 

 ridge, having the appearance of being excavated. Tibi.ie also 

 with a row of short fine hairs or bristle-like hairs running down 

 the outer side, and sometimes with one or two short bristles close 

 to the apex on that side, otherwise, with the exception of the 

 usual apical spines, entirely devoid of isolated bristles or bristle- 

 like hairs. On the three basal joints of the front and middle 

 tarsi three I'ows of minute black spines similar to those on the 

 tibise ; on the basal joints of the hind tarsi they are less distinct, 

 but apparently two rows are present. 



Wings with an absolutely unique venation (see Figure 8), which, 

 apart from all other characters, will at once serve to distinguish 

 a specimen of the genus. The most striking peculiarity is the 

 course of the fourth longitudinal vein. The anterior basal trans- 

 verse vein, at the base of the discal cell, is very short, and the 

 portion of the fourth longitudinal vein before the anterior (small) 



* In the case of GL longipennis, too, the row appears to be broken up 

 into a double line and is consequently barely distinguishable. 



P 



