16 Mr. G. C. Champion and Dr. T. A. Chapman's 



of first abdominal segment, and one on third and one on 

 second thoracic segments at the same level. A certain 

 amount of transverse shading on dorsal plate of first 

 thoracic segment, some coloration of antenna and labial (?) 

 palpi and of leg-joints. Numerous hairs are also evident, 

 irregularly scattered over the head and first thoracic, but 

 on the following segments forming two transverse rows. 



The egg-shell is strongly marked by an irregular but 

 largely hexagonal netting, with the general surface finely 

 dotted. The larva escapes by a longitudinal slit passing 

 down more than half one side of the egg-shell. The egg- 

 shell adheres to the surface on which laid by one end. 



The young larva coloured as within egg-shell at hatch- 

 ing, becomes after a few hours black ; at this stage it is 

 about 1*6 mm. long, black and shining, but surrounded 

 by a halo of short brown hairs, whether viewed dorsally or 

 laterally. 



The full-grown larva has an inky-black abdomen, shin- 

 ing and apparently glabrous, but showing numerous very 

 small hairs under a lens. The thorax is neither yellow 

 nor black, but looks as though yellow obscured by a dense 

 black wash. The incision of the abdominal subsegments 

 passes down below the spiracles, and though a little waved 

 has no definite branch as in 0. vittigera. The prothoracic 

 plate presents numerous hairs over its whole surface, and 

 has various small foveas or pits. The head is distinctly 

 hairy. The underside is rather paler, as of yellow over- 

 laid by blackish. 



These four larvae are really so much alike that it may 

 be well to specially note their differences. 



0. tristis is laid as an egg, the others as larvae. It is 

 smaller than they when first hatched. It is also in the 

 first stage more hairy than they are, though they have hairs 

 all over in their first stage, but only on the head and the 

 sides of the prothorax when full grown, at least the others 

 become microscopic. 



0. cacalise is most distinct from the other three. The 

 prothorax is of a bright yellow, contrasting with the very 

 dark colour of the rest of the insect, which is shining and 

 polished. The prothorax is fully larger than in the others, 

 and hard as it is and solid-looking, is transparent, and 

 allows the tracheae beneath the cuticle to be seen. 0. 

 cacalise is also remarkable for the subdorsal flange which 



