102 



riYnRACAKINA 



The maxillary organ measures 186/1 in lengtli. The rostrum is high, with a curved 

 dorsal margin. The length of the mandible from the base to the end of the membrane is 

 232/i, that of the claw 71^. The dorsal margin of the mandible is evenly curbed. The meas- 

 urements for the palp-segments (in /*) are as follows : 



Between the second and third pairs of epiincru Uic .^kin projects laterally in the shape of 

 a triangular fold. The legs hardly display any specific characters. The spines at the distal 

 end of the segments are finely dentated. 



Genital organ of normal shape. The medial margins of the genital plates carry about 8 

 short and, behind these, alxnit 8 long bristles. In front the plates are obliquely cut off, as is 

 best seen when they are closed. Anterior and posterior to the genital organ, at the same 

 distance, there is a chitinous, circular plate. The excretory opening is bordered at both ends 

 by a chitinous knob. 



9. As usually, the female is larger, attaining a length of about 1170/^. Otherwise it 

 differs from the male only in the genital organ, the anterior chitinous piece of which lies close 

 to the genital lips, not at some distance in front of the organ. The eggs measure alx)ut 241/^ 

 in diameter. 



Nymph. Length about 690/^. In the skin-plates and certain other characters it resem- 

 bles the adult. The shields, however, are smaller, only the frontal shield being of correspond- 

 ing size. There is no fold betw-een the two epimeral groups. The genital organ consists of 

 four acetabula, the two on either side being separated by a medially directed chitinized flap, 

 broadly rounded at the tip, which carries some few hairs. 



Locality. Indian Tibet: Dras (K77), in a stream (temp. + 21.0-24.3°C.), altitude 

 3091 m., 21 May, 1932; CI mile W. of Dras (K76), altitude 3080 m., 21 May, 1932 

 (temp. + 19.0°C.). 



7. Kashmirothyas hutchinsoni gen. et sp. n. 



Generic diagnosis. Colour red. Skin armoured with large shields. Right and left 

 shields of dorsocentralia 3 and 4 united respectively into two shields. Frontal shield large, 

 composed of frontale, prae- and postfrontalia, postocularia, dorsocentralia 1 and 2. Frontal 

 organ non-pigmented. Eyes stalked, projecting over the sides of the body, attached to a 

 chitinous plate, from which also the praeocular bristle arises. First pair of epimera differ- 

 entiated sexually, the anterior corner being blunt in the male, acutely protruded in the female, 

 in both sexes inwardly set with a row of long, pectinate hairs. First pair of legs with 

 sexual dift'erences. Genital organ with more than 3 pairs of acetabula. 



Description of species. 9. Length of body 1017/^. Skin-papillae sharply pointed, 

 spine-like. Dorsal surface covered with large shields, the shape of which varies, as is usual 

 in the Thyasinac. The frontal shield is largest. It is tnmcated in front and tapers gradually 

 toward the posterior end, which is cither truncated or more or less rounded. The frontal 



