Tiiiuu i-,rNTu.\ioLO(;ic. 



423 



central longitudinal dorsal convexity, the second is curved more in- 

 wardly in the middle, third and fourth nearly equal ; fifth, sixth ;ind 

 seventh nearly equal to each other, eighth shghtly smaller than the 

 seventh, ninth nearly equal to the third. Two dark fuscous spots on 

 either side of the base of the vasiform orifice ; the space between the 

 longitudinal dorsal ridge and the lateral margin inwardly is sparsely 

 covered with a thin whitish meal. Margin finely crenulated, the cre- 

 nulations consisting of outwardly pointed translucent: teeth (as seen 

 in specimens treated with K H 10 per cent., dehydrated, passed through 

 clove oil and finally mounted in Xylol X Balsam), the apex of the teeth 

 not reaching the outer margin ; two translucent white setae cephalad, 

 the length of each being O'Ol mm. ; two pointed setaj caudad posteriorly 

 laterally, the length of each seta being 02 mm. ; vasiform orifice sub- 

 conical, posteriorly slightly, produced and not reaching the margin. 

 Length of vasiform orifice 0'03 mm. ; operculum broad, flat, nearly cover- 

 ing loosely the basal broad half of the orifice ; lingula 0-03 mm. long, 0-01 

 mm. broad, broad at base, shghtly constricted in the middle and broad 

 at tip with two fine hairs on either side of the apex, not reaching the 

 apex of the vasiform orifice though projecting prominently beyond 

 the operculum ; two transparent tubercles ending in hairs below the 

 transparent pointed teeth of the crenulations ; two transparent spots 

 on either side of the base of the vasiform orifice, a series of single pores 

 on the margin all round below the pointed crenulations. 



Nymph — 3rd Instar. Length 1-2 mm., breadth 0-45 mm., shiny 

 black in colour with a prominent cretaceous fringe in the margin ; shape 

 elongate elliptical with distinct transverse striations on the dorsum 

 which is shghtly longitudinally raised from the anterior part of the 

 cephalo-thorax to the base of the vasiform orifice. The cretaceous- 

 marginal fringe consists of thin whitish threads closely toucliing each 

 other, the length of each thread being 0-24 mm. The dorsum is covered 

 sparsely with white mealy granules which in some places by coalescing, 

 or toucliing each other closely form small hnes. The coalescence of 

 the granules is greater near the margin thus forming an indistinct fringe 

 all round the margin inwardly. A httle away from this fringe inwardly 

 is another coalescence of granules forming another fringe. There 

 are ten deeply indented transverse hnes on the dorsum. Of thesfc the 

 firf-t. second and the third are subequal, fifth longer than fourth and 

 the following sixth, seventh, eighth and ninth subequal and approxi- 

 mate 1st, 2nd and 3rd in length, tenth small in the form of an inverted, 

 crescent a little above the vasiform orifice. 



Vasiform orifice subcorneal, broad at base, apex somewhat not 

 reaching the margin ; operculum broad heart-shaped fitting loosely into. 



