OXYAMBULYX. 129 



upon the plane of the clasper ; the form of this process is 

 not constant either individually or geographically ; the 

 ventral process may be either pointed, gradually tapering 

 to the end, or broadly spoon-shaped. Penis-sheath ventrally 

 membranaceous for several millimetres ; along this mem- 

 branaceous part runs at each side a dentate fold ; the dorsal 

 side of sheath heavily chitinized and produced into a sub- 

 cylindrical and more or less pointed and bent process of 

 geographically variable length ; from the mouth of the sheath 

 protrudes a spine-like process situated upon the membrane 

 of the duct. 



9- Vaginal plate characterized by a heavy, irregularly 

 notched ridge in front of the orifice. 



Hab. S. India (Kanara District), where we have bred this 

 subspecies, larvae being obtained in dense jungle near the 

 coast. 



Egg. — -Broadly ovoid ; surface shining, minutely pitted ; 

 •colour bright grass-green. Length 2 mm. ; breadth 1-7 mm. 



Larva : — 



Final instar. Head rounded-triangular ; true clypeus one- 

 third length of head, apex acute, basal angles tumid and broadly 

 rounded, giving the clypeus the shape of an ace of spades ; 

 false clypeus a rounded arch rising very little above the true 

 clypeus ; labrum divided into three sections, the central 

 section four-sided, lateral sections triangular and tumid, the 

 central section again divided by a wide dorsal channel ; ligula 

 four times as long as labrum and as broad as the central 

 section of labrum, shaped like a sausage constricted in the 

 middle ; eyes 1 to 4 in a curve, 2 and 3 close together ; 3, 

 4 and 6 in a straight line, 6 much farther from 4 than 4 is 

 from 3 : 5 forming an equilateral triangle with 4 and 6. 

 Surface of head shining, covered sparsely with very small, 

 low, round tubercles ; a very small tubercle on the apex of 

 each lobe. Body of the same shape as that of others of the 

 genus ; surface dull. Horn long, straight, tapering evenly 

 to a blunt point. A line of small tubercles starting subdorsally 

 at front margin of segment 2 and becoming dorso-lateral from 

 segment 5 to near base of horn, where it joins the posterior 

 oblique stripe, these tubercles much larger and transversely 

 elongate near the common margins of the segments. Horn 

 covered with very small tubercles ; many small shining- 

 tubercles on anal flap and claspers. 



Coloration. — Head bluish-green in front of a broad white 

 cheek-stripe, bright green behind it ; the cheek-stripe edged 

 behind with suffused brown ; labrum glassy -green ; ligula 

 pale yellow suffused with brown on the face of each lobe ; 

 basal segment of antenna whitish, other segments soiled pale 

 brown ; mandible greenish at base, rusty at tip. Body 



vol. v. K 



