^20 MR. H. BOLTON ON INSECT-EEilAINS FROM [Sept. I912, 



triangular and strongly convex. The radius is a much-branched 

 vein, with the inner branch considerably divided. The main stem 

 of the radius runs out in the tip of the wing in each case. The 

 anal area is angulated, and in each the anal furrow is sharply bent 

 almost at a right angle, while the chief anal veins are forked. 

 Important differences are observable in the case of the subcostal, 

 median, and cubital veins. The costal vein in the wing under 

 consideration is a relatively simpler structure than in H. ohtusa, 

 the median is more Archimylacrid also in its division into two main 

 branches, and the cubitus throws off a series of simple undivided 

 branches. These differences are, I believe, of more than generic 

 importance — a view already upheld by Dr. Handlirsch, who has 

 taken the division of the median into two main branches as the 

 distinctive feature of a new genus, Soomylacris} To this new 

 genus Dr. Handlirsch has also referred the Etohlattlna deanensis 

 <iescribed by S. H. Scudder.- 



I am indebted to Dr. Handlirsch for drawing my attention to his 

 genus Soomylacris, otherwise I should have unhesitatingly referred 

 the specimen to Hemimylacris, with which it has much in common. 



A comparison of the specimen with the type- species of Soomy- 

 lacris (Etoblaitina) deanensis shows that in the form now described 

 the subcosta is relatively simpler and has fewer divisions than that 

 of S. deanensis. The radius is a much-branched vein, with the 

 lowest ramus considerably divided in both cases, and occupying 

 the same area. The biramal division of the median is a marked 

 feature in the t3'pe-species, and still more so in the form under 

 discussion. 



In S. deanensis the splitting into two rami takes place at the 

 middle of the wing, and of the two divisions the outer is the more 

 •complex, ending upon the wing-tip in at least six rami. In the 

 Dover form the outer division of the median is much the simplest, 

 -and ends just behind the wing-tip in three rami only. The biramal 

 division of the vein also takes place below the middle of the wing. 

 In S. deanensis there are twelve marginal rami for the whole vein; 

 in the Dover specimen there are but eight. 



The cubitus in S. deanensis has its branches forking before 

 Teaching the margin, while the branches of the same vein in the 

 Dover form are wholly simple and parallel one to the other through- 

 out their entire length. In both forms the first anal vein shows 

 repeated bifurcation. 



The differences are quite obviously of specific rank, and I 

 have therefore much pleasure in giving the name of Soomylacris 

 ^Etohlattina) hurri to the Dover specimen, in honour of Dr. 

 Malcolm Burr, to whom I am indebted for the opportunities of 

 research in the Dover Coalfield which resulted in the discovery of 

 the specimen. 



1 'Die Fossilen Insekten & die Phylogenie der Rezenten Formen' Leipzig, 

 1906-1908, p. 259. 



'^ ' The European Species of Etohlattlna, with Description of a New Form ' 

 -Geol. Mag. dec. 4, vol. iii (1896) p. 12. 



