IIEXAPOD INSECTS OF GREAT BRITAIN. 217 



nervures are situated in the interspace between main veins, while those which are trans- 

 verse are between branches of a single vein. 



The specimen comes from the coal measures near Tipton, Staffordshire, where it was 

 obtained by Mr. C. Beale and was kindly sent to me for study by the Eev. P. B. Brodie, 

 Vicar of Rowington, near Warwick, to whom it now belongs. The face examined is the 

 upper surface of the right wing, or else the reverse of the lower surface of the left wing. 

 The second species may be called : 



Archaeoptilus ingens nov. sp. et gen. 

 PI. 17, h'gs. 10-12. 



The costal margin, or marginal vein, is pretty strongly convex at the base, but beyond 

 is straight ; no other margin is preserved, and only the base of this, but the wide sepa- 

 ration and straight course of the upper, and the sweeping curve of the lower, veins indicate 

 an immense expanse of wing both in length and breadth ; all the veins are exceedingly 

 stout. The mediastinal vein is at first directed in a straight line toward (presumably) the 

 middle of the costal margin, but at a distance of 20 mm. from the base bends very 

 gently and vei-y slightly downward, still continuing a nearly straight course, indicating 

 the extension of the vein to the tip or nearly to the tip of the wing ; at the extremity of 

 the fragment, at about 40 mm. from the base, it lies midway between the marginal and 

 scapular veins ; but previous to this it lies nearer the latter. It lies in a slight 

 depression, a little lower than the level of the interspaces beside it, as well as that 

 of the marginal vein. The scapular vein, on the contrary, though broad and flattened 

 like all the rest, lies at a high level from which the wing slopes in a rounded curve 

 equally on both sides; it starts from tbe middle of the base of the wing, and follow- 

 ing a course subparallel to the costal margin, especially beyond the extreme base of the 

 latter, moves in a broad inconspicuous curve, apparently reaching the highest point of the 

 curve at the extremity of the fragment. The externomedian vein crowds against the 

 scapular at base and, at a distance of only about 15 mm. therefrom, it divides into two 

 branches, the upper of which continues the course of the undivided base, but diverges 

 very slightly from the scapular vein ; so that at the end of the fragment the two veins are 

 separated by scarcely more than the width of one of them. Like the scapular vein it lies 

 at a high level, but the lower branch, on the contrary, falls rapidly beyond its origin, so as 

 to lie, at the terminal portion of the fragment, at a lower level than the mediastinal vein • 

 but unlike the mediastinal, and indeed all the other principal veins, it is weak, having less 

 than one-fifth the width of the scapular vein ; it diverges with tolerable rapidity from tbe 

 main branch, and divides equally the space between it and the internomedian vein. The 

 latter vein, again heavy, and also closely crowded at base against the veins above, as far as 

 the division of the externomedian vein, sweeps downward in a pretty strong curve beyond 

 this point, so that at the end of the fragment, up to which it is undivided, it is as far from 

 the upper branch of the externomedian, as the scapular is from the mediastinal. It lies 

 again at a higher level, the space between the lower branch of the externomedian and the 

 internal forming a broad gentle arch, lower and less conspicuous than that between the 

 mediastinal and lower externomedian veins, but otherwise similar to it, at the summit of 



MEMOIRS I30ST. SOC. NAT. HIST. VOL. III. 28 



