part 1] 



ABCHIMTLACEIS PRIlSr&LEI. 



25 



the radius, and is closer to it than is the latter to the subcosta. 

 It gives off the first inward branch a little distance from the point 

 of origin of the radial sector, and feeble traces of a second branch 

 can be discerned farther out. It must have possessed from four 

 to six branches, adequately to support the area of the wing to which 

 it is directed. 



The cubitus starts out from the middle of the base of the wing, 

 gradually bending inwards in its course to the most distal part of 

 the inner margin. Four inwardly directed branches are given off, 

 the first passing under the first anal, owing to the fracture of the 

 wing. The second divides by a simple fork in the middle of its 

 length, while the third and fourth are undivided. All the branches 

 of the cubitus come ofE at wide angles, and so the area enclosed by 

 this vein is large. 



I^ig. 2. — Archimylacris desaillyi LericJie. x 3. 



A. 



Cu. 



A. = Anal. 

 C. == Costa. 



Sc. =: Subcosta. 

 Cu. = Cubitus. 



E. = Radius. 



Rs. = Radial sector. 



M. = Median. 



The anal area has broken away from the rest of the wing, and 

 moved a little forwards, overlapping the first branch of the cubitus. 

 The anal furrow is no longer distinguishable, having lain along the 

 line of fracture. Six anal veins are present, the first somewhat 

 obscure, and the second and third possibly united at their base. 



The interstitial neuration consists of a compact series of close- 

 set transverse nervures, which, in the basal areas between the 

 radius, median, and cubitus, anastomose laterally, forming a fine 

 network. 



Affinities. — I was at once struck with the likeness of this 

 specimen to the form described by Leriche,i as Archimylacris 



1 Ann. Soc. Greol. Nord, vol. xxxvi (1907) p. 164 & pi. ii. 



