PSILOGRAMMA. 79 



cJ. Tenth tergite (fig. 13 A, B) divided into two slender 

 •curved processes which lie close together, but are movable 

 separately : sternite short and broad, the lobe broader than 

 long, truncate-sinuate, the angles slightly produced, sides 

 distally rounded-dilate. Patch of modified scales about 

 three times as long as broad, deep brown except at edges. 

 Process of penis-sheath (fig. 13 E) very characteristic, some- 

 times distinctly asymmetrical. 



$. Postvaginal portion of vaginal plate (fig. 13 F) chitin- 

 ized, smooth, scaled, half-moon-shaped, somewhat truncate, 

 the lateral margins elevated ; vaginal cavity surrounded 

 proximally and laterally by a wrinkled membranaceous ridge. 



Hab. Throughout the Indian Sub-region, China and east- 

 wards to the Solomon Islands. Widely distributed and 

 locally common, in both forests and open country, up to 

 '6,000 feet elevation. We have bred it in the E. Himalayas 

 (Khasi Hills) and S. India. 



Egg. — Shortly ovoid, surface smooth and shining ; colour 

 pale green. Length 1-6 mm. ; breadth 1-4 mm. 



Larva : — 



Final instar. Head round, slightly longer than broad, vertex 

 rounded ; true clypeus one- third to one-half length of head, 

 basal angles rounded and slightly tumid ; labrum three- 

 quarters length of clypeus ; ligula as long as labrum, shaped 

 like a bent sausage ; eyes 2, 3, 4 and 6 nearly in a straight 

 line, 1, 2 at an angle of about 120° to that line ; 1 and 2 and 

 3 and 4 less than an eye-diameter apart ; 5 and 6 about two 

 diameters from 4, 5 about three diameters from 6. Surface 

 of head smooth and shining. Body nearly cylindrical, tapering 

 slightly from segment 5 frontad. Horn long, straight or slightly 

 down-curved, stout at base and tapering evenly to a blunt 

 point. Surface of body smooth and dull ; on segments 2 to 4 

 transverse rows of large, shining, rounded tubercles, two rows 

 each on 2 and 3, one row on 4, each row running along a 

 secondary ring over the dorsum, about eight tubercles in each 

 row ; horn shining and covered with large, shining tubercles. 



Colour. Head grass -green ; a white stripe running down the 

 cheek from near vertex to base of antenna ; labrum and 

 ligula opaque white, sinus of ligula bordered rusty-red ; basal 

 ■and second segment of antenna pale yellow, third segment 

 pale rusty-red ; mandible pale yellow, outer face pale rusty, 

 tip broadly reddish -brown. Segments 2 to 4 of body bluish- 

 green, the tubercles white or yellow, rest of body bright 

 grass-green in dorsal area, paler bluish-green in lateral area ; 

 a narrow whitish dorsal stripe from 5 to base of horn ; seven 

 broad white oblique stripes on 5 to 11, the upper edge sharply 

 defined and bordered with dark green, the lower edge ill- 

 defined ; each stripe runs back to join the dorsal stripe 



