THERETRA. 439 



Egg. — BroadJy ovoid, surface smooth and shining, colour 

 bright grass -green. Length 1*5 mm. ; breadth 1*3 mm. 



Larva : — 



1st instar. Head yellow, body greenish-yellow ; horn very 

 long, straight, shining black in colour. 2nd instar. Head 

 yellowish-green, body shining green ; a small dull purplish 

 dorso-lateral ocellus on segment 5 ; a whitish dorso-lateral 

 stripe from 5 to base of horn ; horn black with red base. 

 3rd instar. Green dotted with yellow ; dorso-lateral stripe 

 yellow. 4:th instar. Dorsum with white dots ; the ocellus 

 with pupil black in front, red behind, the red portion containing 

 a yellow inverted comma-shaped marking, the whole edged 

 narrowly with blue and then black ; the dorso-lateral stripe 

 edged above with purple on segments 11 and 12 ; horn 

 pale greenish -brown dor sally, still paler ventrally, with 

 small black tubercles. 



5th instar. Head with dorsal line slightly depressed on ver- 

 tex ; clypeus one-half length of head, apex acute, basal 

 angles rounded ; apex of false clypeus forming a wide gothic 

 arch over apex of true clypeus, reaching to two-thirds length 

 of head ; labrum nearly half as long as clypeus, tapering 

 frontad, longitudinally ridged ; ligula as long as labrum ; 

 cutting-edge of mandible obscurely toothed ; eyes 1 to 4 

 equidistant in a slight curve ; 6 in line with 3 and 4 and 

 twice as far from 4 as 4 is from 3 ; 5 forming an equilateral 

 triangle with 4 and 6. Surface of head dull, under a lens seen 

 to be transversely wrinkled. Body as in others of the genus, 

 dull and smooth, segments 5 and 6 not much swollen. Horn 

 of medium length, stout at base, tapering gently till near the 

 tip, where it suddenly narrows to a point, basal half of horn 

 straight and rising vertically, distal half bent sharply down- 

 wards ; surface dull and covered with small tubercles. 



Green form : head green, labrum, ligula and basal segment 

 of antenna green, other segments of antenna soiled white ; 

 mandible green with tip narrowly brown ; eyes brown. 

 Body grass-green with a transverse row of coalescing dots, 

 whitish above the dorso-lateral stripe, yellow below it, along 

 each secondary ring on segments 5 to 12 ; a narrow black 

 dorsal stripe on 2 to 5 ; a dorso-lateral ocellus on 5 coloured 

 as in the 4th instar, but when nearly full-fed the yellow comma- 

 shaped mark disappearing ; a yellow suffusion between the 

 ocelli over the dorsum ; a narrow white dorso-lateral stripe 

 from 6 to base of horn. Horn green ; legs red. Spiracles 

 elongate-oval, fuscous, the ends shortly yellow, the whole 

 edged narrowly with black and then yellow. 



In the dark- coloured form the head is dark brown dotted 

 with paler brown ; labrum and ligula brown ; basal segment 

 of antenna whitish, other segments reddish ; mandible yellow, 



