256 Dr. T. A. Chapman's 



the strict regularity that the idea of rows implies ; they are 

 wanting near the incisions, both segmental and subseg- 

 mental. The 8th and 9th abdominal segments possess 

 hairs, especially a row of strong ones along their hind 

 margins, and 10 is not without finer hairs. Beneath the 

 abdomen each segment possesses shorter hairs, about ten 

 on each side, placed with some but not absolute bilateral 

 symmetry. The subspiracular flange on each segment has 

 a separate chitinous plate carrying four or five longer and 

 four or five shorter hairs. 



The hairs on the prothorax are very numerous, and 

 except a certain regularity rovmd the margin, are equally 

 but irregularly distributed over the whole surface, they 

 number about 110 on either side. 



The pupa of 0. tristis is 10 mm. long and 4"5 deep from 

 back to front across the 3rd abdominal segment, and 6'5 

 wide from knee-joint to knee-joint of 2nd legs, but this 

 when they are a little set forward, the natural position 

 would give perhaps nearer 5"3 mm. This is from a small 

 specimen, a larger one would probably be 12 mm. long. 

 The colour is pale whitish tending to flesh-culour, and 

 deepening as the beetle matures. 



The head is well bent forward, i. c. ventral, so that the 

 face is directed ventrally, and the abdomen is also curved 

 forwards, so that the ventral line is nearly straight, running 

 from the frons down the clypeus, labrum, labium, tarsi to 

 the anal point. The dorsum, on the other hand, presents a 

 curve from one of these points to the other, and distant 

 from it (as above noted) 4'5 mm. at the widest point. 



The antennse pass first backwards then down behind 

 the 1st femora, their apices pointing forwards between the 

 1st and 2nd knee-joints. The wings pass down between 

 the 2nd and 8rd legs, and curving round to the front, hide 

 the greater part of the 8rd femora and tibiae, and do not 

 meet in front by about 2'6 mm. The first wings (elytra) 

 show several longitudinal ribs or veins of which one on 

 either side is marginal, and three over the centre are more 

 marked than the others. The 2nd wings (wings) are visible 

 dorsally in a narrow slip passing under the 1st wings, 

 and their apices also appear beyond the first over the ord 

 tarsi. 



The jaws, labrum, labium with palpi, the maxillary palpi 

 of three (?) joints passing straight backwards are very 



