Vol. 68, "] THE MIDLAND AND SOFTH-EASTBEN COAL MEASURES. 319" 



The inner branch takes a broad shallow inward sweep as it runs 

 outwards to the distal portion of the inner margin. It gives off^ 

 quite low down and on its outer side, a single ramus w^hich forks 

 three times before ending in the inner half of the wing-tip. 



The cubitus pursues a course parallel to the inner division 

 of the median, giviag off six inwardly-directed oblique and simple 

 branches, all of which reach the wing-margin without further 

 division. The marginal area of the cubitus is a little less than that 

 of the median, while all the branches have the same degree oi: 

 obliquity. 



The anal furrow is deeply sunken, and bent almost at a right 

 angle at the junction of the first and second fourths of its length,, 

 beyond which point it passes obliquely outwards to the margin. 

 As the angulation of the furrow takes place at some little distance 

 below the point of origin of the first branch of the cubitus, the 

 space between the latter and the anal furrow is very broad near the 

 middle line of the wing, and diminishes to a normal width as the 

 margin of the wing is reached. 



The anal area is large, broadly triangular, and shelves off steeply 

 near the middle line of the wing into the deep anal furrow. It i& 

 almost as large as the costal area, but the anal angle is more pro- 

 nounced, being not so well rounded as the costal. Pour anal veins. 

 are present, the first dividing twice before it reaches the margin in 

 three rami; the second forks low down, and then follows a curved 

 course to the margin, the convexity of the curve being directed 

 towards the inner margin. The third vein is simple, and follows a 

 parallel course of the inner ramus of the second, while the fourth 

 vein is forked twice and similarly curved. 



The general character of the wing is that of a strong, horny or 

 leathery structure, articulated to the body by a powerful and rigid 

 base composed of tlie united subcostal, radial, median, and cubital 

 veins. 



Affinities. — Fortunately this wing is a well-marked type, and 

 there can be no hesitation in referring it to the family Mylacridae. 



The broadly-triangular costal and anal areas, the short stout 

 character of the wing itself, and the general mode of division of tha- 

 radial, median, and costal veins, are alike all distinctive. 



Dr. Handlirsch has already pointed out ^ that the family has 

 certain Archimylacrid affinities, due, he believes, to the family 

 being a lateral branch which arose at an early date, and still pre- 

 served certain primitive characters. These Archimylacrid affinities 

 are seen in the much-branched radius, and in the presence of two- 

 main branches of the median. 



The relation of this wing to Hemimylacris obtusa Bolton, from 

 South Wales, is remarkably close.- In both, the costal area is- 



^ * Eevision of American Palaeozoic Insects ' Proc. U.S. Nat. Mus. vol. xxix 

 (1906) p. 766. 



'^ 'Insect-Remains from the South Wales Coalfield ' Q. J, G. S. vol. Ixvii) 

 (1911) p. 154 & pi. X, figs. 4-5. 



