432 Mr. S. Hirst on . 



more than three times as long as wide; tlie dorsal surface is 

 convex. Anterior portion of body bearing the two first pairs 

 of legs strongly chitinized ; dorsally it is covered by two 

 strong plates, the anterior one being small and trapezoidal in 

 shape and considerably longer than wide. More than half 

 the rest ot" the dorsal surface is covered by a thin chituious 

 plate, the posterior end of which is truncated. Venter and 

 uncovered part of dorsal surface striated, the striations being- 

 transverse except on the anterior part of the venter, where 

 they run obliquely. Numerous minute denticles with their 

 points directed backwards are present on the ventral surface 

 of the abdomen. There are only a few hairs on the body, 

 and they are all very fine and short. 



Capituluni large and triangular in shape, the apex pointing 

 forwards ; the greater part of this structure is formed by the 

 palps, especially by the second segments, which are strongly 

 salient laterally. 



Legs. — The two first pairs of legs are rather wide and con- 

 siderably flattened ; tarsus of these limbs grooved below and 

 furnished with a distinct curved knob, besides smaller pro- 

 tuberances. Although reduced in size, the pulvillus is present 

 on the tarsi of these legs. Posterior legs slender and with 

 the pulvillus large. Hairs on legs few in number and mostly 

 short and inconspicuous, but there is a long fine tactile hair 

 at the distal end of the third tarsus. 



Generative nymph much smaller and less elongated than 

 the ovigerous female. A longitudinal series of minute 

 curved lobes or scales runs down the middle of the dorsal 

 surface, coming to an end a little distance from the poste- 

 rior end. The series is really a double one, the lobes of 

 each side facing one another, and each bearing a thin back- 

 wardly directed spine. These lobes arise from the inner end 

 of the oblique striations present on the body. 



Male a little smaller than the generative nymph. Poste- 

 rior end of body produced, forming a distinct process or tail 

 (which is much shorter than the tail-like process present in 

 tlie male nymph) ; this process is slightly rounded at the end. 

 Tnere is a pair of minutg^suckers on the venter just in front 

 of the posterior end of the body. Genital aperture placed 

 opposite the proximal segments of the last pair of legs. The 

 three anterior pairs of legs are very similar to those of the 

 female, but the last pair are considerably longer than the 

 others, and the tarsus is bent so as to form a hook ; a small 

 pulvillus is present on this modified tarsus, and also a fairly 

 lono; and blunt hair or seta. 



