26 



MR. H. BOLTOlSr OlS^ 



[vol. Ixxvii, 



desaillyi, and therefore sent an enlai-ged photograph of the 

 specimen to Dr. P. Pruvost, Lille Universit\^ in whose custody 

 Leriche's t^q^e now is. Dr. Pruvost recognized the likeness, but 

 thought that it Avas more closely allied to a form referred by 

 himself first to A. helgica Handlirsch, and later described by him 

 as a new species, A. lerichei}- 



Dr. Pruvost takes note of one feature Avhich has caused me to 

 regard the specimen as nearer to A. desailiyi than to A. lericliei^ 

 namel}^ the great differences in the form of the distal end of the 

 costal vein. In A. lericliei, the subcostal is not sharpl}'- bent 

 outwards as in this specimen and in A. desailiyi, but is decidedly 

 oblique, so that the costal area is much less strap-shaped than in 

 either. Nor is the general course of the subcosta so truly parallel 

 to the margin. 



A. pringlei, sp. nov. 

 Costal Area. 



Strap-shaped, widel}- 

 spaced from wiiig-margiii. 



Subcostal Vein. 



Numerous divisions, 

 mostlj' forking-, 



Radius Vein. 



Few branches. Radial 

 sector arising opposite outer 

 fourth of subcosta. 



Radial Sector. 

 Branching not known. 



Median Vein. 



Branches beyond origin 

 of radial sector. 



Cubitus Vein. 



First branch simple, 

 second forked. 



Anal Veins. 

 Undivided. 



Interstitial n e u - 

 ration. 

 Transverse nervures, 

 except in the median basal 

 part of the wing, where it 

 is reticulate. 



Tabulated Compaeison. 

 A. desailiyi Leriche. 



Strap-shaped, widelj'' 

 spaced from wing-margin. 



Numerous divisions, 

 mostly forking. 



Seven branches. 

 Radial sector arising 

 opposite outer third of 

 subcosta. 



Eiii'ht branches. 



Branches opposite first 

 fork of radial sector. 



First branch simple, 

 second and third forked. 



First vein only forked. 



Transverse nervures, 

 except in the median 

 basal part of the wing, 

 where it is reticulate. 



A. terichei Pruvost. 



Outer third oblique to 

 winjc-niargin. 



Few divisions, much 

 bn^nched. 



Twelve branches. 

 Radial sector arising 

 opposite middle of sub- 

 costa. 



Seven to eight bran- 

 ches. 



Branches much beyond 

 origin of radial sector. 



First branch dividing 

 into four, second simple, 

 third and fourth bran- 

 ched. 



First anal forking 

 twice. 



Transverse nervures, 

 except in the median 

 basal part of the wing, 

 where it is reticulate. 



' Les Insectes Houillers du Nord de la France ' Ann. Soc. Geol. Nord, 

 vol. xli (1912) p. 335 & pi. ix, figs. 4-4a; see also 'Introduction a I'Etude du 

 Terrain Houiller du Nord du Pas-de- Calais : La Faune Continentale du 

 Terrain Houiller du Nord de la France ' Paris, 1919 [1920], p. 154 & pi. viii, 

 figs. 5-6, 



