MESOZOIC COCKROACHES. .| -,7 



was a little more than three times as long as broad, and, while nearly equal in width 

 throughout, broadest in the middle. The humeral field is large, lancet-shaped but broad- 

 est shortly before its pointed tip, reaching just about to the middle of the wing. The 

 mediastino-scapular vein is pretty strongly sinuous and especially arcuate a little be- 

 yond the base, exactly as in M. Higginsii, curving upwards apically and terminating be- 

 fore and above the tip, making the costal area broadest in the middle, where it is a little 

 less than half the width of the wing; the nervules are exactly as in M. Higginsii or per- 

 haps a little more oblique. The entire structure of the externomedian is a repetition of 

 what is found in the last species, excepting that the basal divergence from the upper 

 veins, is a trifle earlier and that all the nervules impinge on the apical border above, in- 

 stead of all below the tip. The internomedian veins, are more numerous and crowded 

 than in M. Higginsii, have a more decided basal curve, and so throughout nearly their 

 entire length are almost completely longitudinal, sub-parallel to the mediastino-scapular 

 vein, and undoubtedly parallel to the inner margin. The anal area is tolerably large, 

 but not so large as in the last species; the furrow, which has the character of the other 

 veins, is strongly arcuate in the basal half, bent beyond the middle, and transversely ob- 

 lique and straight beyond, terminating probably at about the end of the basal third of the 

 wing. As stated, the anal veins are absent, and it is only presumed to belong in this 

 section by its affinities to others and especially to M. BucTdandi. 



Length of fragment, 11.5 mm.; probable length of wing, 13 mm.; breadth, 3.85 mm. 

 The specimen studied is the original of Westwood's figure and comes from the Lower 

 Purbecks of Durdlestone Bay. 



Mesoblattina Bucklandi sp. now 



PI. 47, fig. 2. 



Although a slight fragment is broken from the base and from the apex of the specimen 

 representing this species, it is practically perfect, and though the costal margin is con- 

 siderably less arcuate, it is of much the same shape as that presumed of M. Murcliisoni 

 with which it agrees closely in all other particulars. It shows an under surface, being 

 concave, the anal area separately and to a considerable degree; the veins run along the 

 top of convex ridges. The humeral field is, however, simple, lancet-shaped and only 

 about two-fifths the length of the wing, though still extending further than the anal 

 area. The costal area is almost a complete duplicate of that of M. Murcliisoni, but is a 

 little broader in the middle, almost equalling half the breadth of the wing. The exter- 

 nomedian vein arises in the same wa} r but first forks a little later, just beyond the tip of 

 the anal area, and the branches, diverging very slightly and uniformly, cover a con- 

 siderable space on the margin, so as to occupy nearly all the arcuate portion of the apex 

 below the costal area. The internomedian veins are hence a very little less longitudi- 

 nal, trending slightly downward, though they strike the margin only in the apical half 

 of the wing. The anal area is of about the same size, but the furrow, which if an 

 upper surface were shown would be uniformly and rather deeply impressed, is almost 

 uniformly arcuate, with no median bend, striking the margin obliquely, a little beyond 

 the basal third of the wing. The anal veins, next the furrow subparallel to it, form as a 



