442 Dr. E. J. Tillyard on 



structures can be seen through the pale skin by transmitted light in 

 the dead larva. General shape oval, with projecting labrum and 

 clypeus, fairly broad frons, epicranium and occiput. Anteiinae 

 (Text-fig. 1, a) placed very wide apart, slender, 0-3 mm. long, com- 

 posed of three segments, of which the 1st is short and stout, the 2nd 

 long and slender, the 3rd short and very slender, ending in a terminal 

 sensory hair. Compound eyes (Text-fig. 1, a) present, situated just 

 exteriorly to the antennae. Each compound eye consists of five 

 facets, of which the four posterior are placed very close together -to 

 form four-fifths of a complete circle, each facet being in the shape 

 of a sector of that circle, while the anterior one is much larger, circular 

 in form, and projects outwards as a larger hemispherical lens, so as 

 to break the completeness of the contour of the circle. There is no 

 sign of the sixth or ventral eye-element of other Lepidopterous 

 caterpillars. True ocelli are altogether absent, as in almost all 

 insect larvae. 



Mouth-parts : — Labrum epipharynx (Text-fig. 1, 6) broad, excised 

 in the middle of its anterior margin, well rounded on either side of 

 the excision; it carries eight strong sensory setae and some finer 

 hairs. Mandibles (Text-fig. 1, c) asymmetrical, stout, fahly short, 

 the right mandible Avith two double teeth separated by a deep 

 incision, the left mandible with three single teeth, of which the 

 apical one is the largest, the middle one slightly smaller, and the 

 third very much smaller; each mandible also carries, below the 

 toothed area, a longish edge armed with short, stiff bristles. Maxillae 

 (Text-fig. 1, d) with short cardo, large, swollen stipes, prominent 

 three-segmented palp, slender sharply i:)ointed galea, and broader, 

 rounded lacinia ; the galea carries a few prominent hairs. Labium 

 (Text-fig. 1, e) consisting of a broad basal i:)ortion (either the mentum 

 or perhaps the fused submentum and mentum), from which projects 

 a broadly rounded inner lobe and two small palps ; these latter appear 

 at first sight to be only two-segmented, but closer examination 

 shows a very small ring-like basal segment in addition ; the rather 

 slender terminal segment ends in a short sensory seta. No definite 

 spinneret apparatus could be discovered. 



Thoeax : — Proihorax narrower than the other segments, but 

 longer than the two following thoracic segments. It carries a sharply 

 defined anterior ridge, which marks off an anterior declivity carrying 

 the head-pouch, from a posterior portion of normal form, which carries 

 the spiracles. Mesothorax shorter and somewhat wider than pro- 

 thorax, its posterior border strongly convex dorsally. Metathorax 

 again somewhat shorter and wider than mesothorax. Legs very 

 short and small, showing only two definite segments and a terminal 

 claw ; in correlation with the widening of the thoracic segments from 



