122 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 

 Hemimylacris obtusa, Bolton. Plate VIII, fig. 7 ; Text- figure 38. 



1911. Hemimylacris oliii/xu, Bolton, Quart. Jourii. Geol. Sue., veil. Ixvii, ji. Io4, pi. x. fi^s. 4, - r >. 



. A stout right tegmen, lying on a surface of fireclay full of Stigmarian 

 rootlets, and distorted by pressure ; Museum of Practical (Jeologv, .lermvn Street 

 (no. 24510). 



Horizon and Lornlih/. 1'pper Coal Measures (Four- Toot Seam of Swansea); 

 Gladys Colliery, one mile east-south-east of IVnller-gaer Cliurcli, (ila.ni. 



S/n'i-iJit- ChdLTacteTS . Costal margin convex; subcostal vein dividing bv 

 repeated forking into five twigs; costal area triangular. Radius with a radial 

 sector, the latter much divided. Median with a few forked inward branches. 

 Cubitus large, with four branches, the second twice forked. Anal area wide, and 

 crossed by numerous veins, the first giving off a simple branch, and then dividing 

 twice by equal forking. Inner margin almost straight. 







FIG. 38. Hi'mimi/liii'i-it uliliisii, lioltoii; diagram of rig-lit fore-win"; with apex restored, three times 

 natural size. Up]" 1 ]' I'ual Measures (four-foot Seam t Swansea); Gladys Colliery, near Penller- 

 <_jacr Cliurcli, I i laiiiur^anshii-c. Mus. Tract. Gc.,1. (no L'-tolOj. Nimilii-nn^ of veins as in Text 

 %urc 33, p. 104. 



Description. A short rounded right teginen, 23 mm. long and 14 mm. wide, 

 broken across the basal third along the anal furrow, and the apex missing. 



The subcostal area is broadlv triangular, the subcostal vein sunken, and 

 passing out obliquely, giving off a basal branch which forks into two equal twigs, 

 the most distal twig forking again. A single undivided branch is given off near 

 the end of the subcosta. 



The radius gives off a strong radial sector, and afterwards sends outwardly 

 three simple branches. The radial sector sends four branches to the margin, t In- 

 first forking twice, and the fourth once, the second and third being simple. 



Tin.- median vein appears to give off the stem of the cubit us near its base, but 

 this appearance is probablv due to t he crumpling of t he legmen. The first of I lie 

 three inward branches of the median arises further out than any of the division> 

 of the radius or cubit us. 'I' he first branch divides into three t wigs, and 1 lie second 

 Forks on the broken edge of (he wing. All the branches pass straight out towards 

 the wing-apex. 



