60 B. GRASSI AND A. SANDIAS. 



like the first with spines and setse ; the third is furnished with 

 two claws, and has no plantula. 



The femur and tibia of the middle legs are subequal ; the 

 latter is furnished beneath, towards its apex, with peculiar 

 short spines. The first tarsal joint (PI. 19, fig. 10) is slender, 

 cylindrical, shorter than that of the anterior pair, and fur- 

 nished below with numerous spines similar to those of the 

 tibia, and with a bare^ colourless papilla at its apex; 

 the second is very short, subcylindrical, and similar be- 

 neath to the first; the third is about twice as long as the 

 second, but markedly shorter than the first, and possesses two 

 claws as in the anterior legs. 



The hinder femora are stout and longer than the tibiae. 

 The tarsi (PI. 19, fig. 11) resemble those of the second pair, 

 except that (1) the basal joint is more robust ; (2) it is 

 shorter in comparison with, and therefore nearly equal to the 

 third ; (3) it has a median ventral papilla similar to the one 

 near the apex ; (4) the second joint is not spinose below, but 

 the base of the distal papilla is furnished, as far as I have seen, 

 in the larva and the adult female with small spines on its inner 

 side, which are absent in the male ; (5) the claws are more 

 robust. 



The abdomen is much longer than the thorax, and its 

 tergites are better developed than the sternites ; the former 

 are ten in number, the last three being the smallest. 



The tenth tergite of the female and of the larva of both 

 sexes is triangular and very broad at the base. In the adult 

 male it is produced backwards into two asymmetrical apophyses 

 [titillatores], a right and a left (PI. 19, fig. 6 3), the former 

 being the larger. As the smaller process is entirely covered 

 below by the penis, it is not easily made out, except at its apex, 

 which is spirally twisted. 



The cerci are bi-articulate, symmetrical in the adult 

 female and larvse, asymmetrical in the adult male, in which 



1 With high magnilicatiou the base of the papilla shows a few minute 



spines. 

 » [In this figure the drawing is reversed ; it is so in the original plate.] 



