﻿56 



ME. H. BOLTON ON SOME INSECTS 



[vol. lxxii, 



I had been unable to determine the exact condition and course of 

 the veins in the radial sector and median areas. Dr. F. A. Bather 

 afterwards drew my attention to two photographs made of the 

 specimen at the British Museum (Natural History) in June 1914, 

 in which the intercalary venation was clearly shown. The detailed 

 structure of the wing was brought out by the simple expedient of 

 photographing the specimen while it was immersed in water. 

 From a study of the British Museum photographs, kindly lent for 

 the purpose, many of the doubtful points of the wing have been 

 cleared up, and its nearness to Hyper meg ethes schucherti Hand- 

 lirsch made more certain. The wing is now redescribed in the 

 light of the knowledge thus obtained. — H. JB., March 31st, 1916.'] 

 The costa is moderately convex from its base to a distance 

 of about 30 mm., beyond which it becomes perfectly straight. 

 Separated from the costa by a very wide area basally is the sub- 

 costa, an extremely feeble and hardly distinguishable vein. It 

 passes straight out to meet the costal margin some distance beyond 

 the middle of the wing. 



Fig. 5. — Restoration of the left wing of Hypermegethes 

 northumbrise, sp. nov. (Natural size.) 



The radius arises close to the sub-costa, and remains parallel to it 

 along its whole length. It gives off two branches posteriorly, the 

 more proximal branch passing obliquely inwards towards the inner 

 portion of the wing-apex ; while the second or distal branch arises 

 from the radius a little farther out, and keeps parallel to it. I had 

 formerly considered the proximal branch of the radius as the radial 

 sector, and the distal one as a simple branch of the radius only. If 

 the wing be closely related to that of Hypermegethes schucherti, 

 which now seems most probable (as will be seen later) my former 

 view will not hold. It would seem that the proximal branching 

 vein must be regarded as the main stem of the median vein, which 

 has entered into union with the radius, and that the distal branch 

 is the radial sector. 



Regarding the proximal branch of the radius as the median 

 vein, I find that it diverges widely from the radius. It gives off 

 a forward twig, which runs parallel to the radial sector, and then 

 continues inwards until it cuts across the next vein, the two veins 



