DESCRIPTIONS OF GENERA AND SPECIES. 279 



but all these have plain edges, without spikes. The 

 under side of each tarsus terminates distally in a short, 

 stout, recurved point or hook. There is a very long 

 tactile hair on the first leg, springing from a large 

 papilla ; a few fine hairs on the tarsi, and a short thick 

 hair on the upper side of the tarsus of the second leg. 

 There is a curved, strongly serrated hair on the upper 

 side of the femur of the same leg; a curious curved 

 hair, with a very few long pectinations, on the under 

 side of the tibia of the third leg ; and a rough, clavate 

 hair on the under side of the genual of the same leg. 

 There are a few other hairs of minor importance. The 

 bands behind the maxillary lip and the sternum are 

 nearly similar to those of the female ; the sternum is 

 rather longer than that of the female, and its posterior 

 bifurcation forms a small close arch with free posterior 

 ends, instead of the wide arch with attached ends 

 formed by the corresponding parts in the female. The 

 epimera of the first, second, and third legs join this 

 arch. There are epimera to the fourth legs, but they 

 are free. The penis is placed between the coxae of the 

 fourth pair of legs ; it is large, somewhat conical, and 

 points forward ; its point, when at rest, lies within the 

 sternal arch ; it is divided proximally into two diverg- 

 ing blades, and is protected on each side by a small, 

 curved, chitinous band. The anus is smaller than that 

 of the female. 



Nymph (PL XVI, fig. 4). Colour pure white when 

 young; rather yellowish white when fully grown. 

 Texture dull, semi-transparent, finely but irregularly 

 wrinkled. Cephalothorax large, fully one-third of the 

 total length ; its hinder part as wide as the abdomen. 

 Rostrum rather concave, blunt ; rostral hairs thick, 

 almost leaf -like. Behind the rostrum there usually is 

 a transverse ridge with returned ends. The dorsal 

 surface of the hinder part of the cephalothorax is 

 ornamented, or protected, by numerous small plates of 

 clear colourless chitin of various shapes ; the arrange- 

 ment of these plates is usually as follows, viz. com- 



