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ME. H. BOLTON ON SOME INSECTS [vol. lxxii r 



almost, or quite, the apex of the wing. The sub-costa gives off: 

 a series of straight veins, which pass obliquely outwards to the 

 costal margin. How numerous these veins were it is not possible 

 to say, as the matrix obscures much of the finer detail. 



The radius is a strong vein, standing out above the general 

 wing-surface, and keeping a fairly parallel course to the sub-costa 

 and the wing-margin. It gives off the main stem of the radial 

 sector at an acute angle, at about 22 mm. from the base of tbe 

 wing. 



The base only of the radial sector is shown. This arises from the 

 radius at a point about 9 mm. in front of the broken edge of the 

 wing. 



The median vein is the most important vein of the wing. It 

 arises close to the radius, and continues parallel to it for a short 

 distance, and then forks into two equal branches, both of which 

 become widely separated from the radius, and one from the other. 

 The anterior branch gives off an outer twig opposite tbe point of 

 origin of the radial sector, which it approaches very closely. The 

 inner branch of the median passes in a straight line obliquely out- 

 wards and downwards in a direction which would bring its ultimate 

 twigs out upon the middle of the inner wing-margin. It gives off, 

 near the base, a posteriorly -directed vein which curves sharply 

 away from the main branch and then passes outwards and back- 

 wards parallel to it, the sharp outward curve of the vein causing 

 the formation of a very wide interval between the two. 



The cubitus evidently divides quite close to the base of 

 the wing. The outer branch passes backwards and outwards in a 

 gentle double curve, giving off two simple twigs from its inner side. 

 The inner of the two main branches of the cubitus passes obliquely 

 backwards, divided into two twigs near the base of the wing, and 

 the outer of these divides again before reaching the wing-margin. 



The anal veins were few in number, remains of four only being 

 left. These all pass obliquely backwards, and the outermost forks 

 before reaching the middle of its length. The remaining three are 

 evidently undivided. 



Very few traces of intercalary venation are distinguishable. 

 Allusion has already been made to a few oblique veins, which cross 

 the intercostal area. The only other intercalary veins are a few 

 almost straight and well-spaced cross-veins which bridge over the 

 wide interval between the innermost twig of the median and its 

 fellow 7 . 



Affinities. — The mode of division of the radius and the 

 median, the- wide area between the inner divisions of the latter and 

 the cubitus, the manifest importance of the median, and the few 

 widely-spaced cross-veins, are all typical Spilapterid characters. 

 The wing cannot be confused with Stenodictya, in which the 

 median is much less developed, and the intercalaiy venation 

 reticulate. 



From Becquerelia the wing is distinguished by the non-union 



