MESOZOIC COCKROACHES. 453 



P. B. Brodie. It rests on a dirty brown stone, the veins being blackish. I have named 

 it for Rev. J. F. Blake who has made some researches upon the Lias insects. 



Next to this I place, doubtfully, a couple of forms which arc evidently nearly related, 

 and apparently belong in this vicinity, but are too imperfect to discuss fully until bet- 

 ter material shall offer. 



One of them (PI. 46, fig. 3) has a large and long costal area in which the main vein is 

 regularly arcuate and its oblique branches are distant at base and apically forked; an 

 externomedian vein of little importance with two or three wholly longitudinal branches 

 running down the middle of the wing; an internomedian with three or four inferior, at 

 first rather distant, bent branches, terminating far out; and an anal furrow which is ob- 

 lique and straight apically, indicating a rather large anal area. 



It should be noted however that the internomedian area is entirely separated from and 

 lies at a slightly lower level than the rest of the wing, so that it is not impossible (though 

 not probable) that there are two wings here. Both parts are perfectly flat with brown- 

 ish veins. 



The length of the fragment is 5.75 mm. and its breadth 4.5 mm. indicating a wing 

 about 12 mm. long, and perhaps 5 mm. broad. It comes from the English Purbecks 

 and was sent me by Rev. P. B. Brodie. On the same stone, close beside the upper frag- 

 ment, lies the specimen of Diplurdblattina Bailyi described further on and figured on 

 PI. 48, fig. 5. 



The other (PI. 46, fig. 13) has a broad costal area which would be rather short, but 

 that the otherwise rather strongly arcuate main vein is reinforced apically by two or 

 three superior longitudinal branches, while the inferior branches are numerous, simple, 

 parallel and oblique; the externomedian vein is much as in the preceding and the inter- 

 nomedian has almost equally longitudinal veins, forking considerably and gently arcuate 

 at base indicating a long anal area. The slight depression of the veins indicates an up- 

 per surface, but the surface itself is perfectly flat. There is a slight ferruginous tinge 

 to the wing which with the blackish brown veins distinguish it quickly from the dirty 

 light brown stone. The length of the fragment is 9 mm. and its breadth 4.25 mm., in- 

 dicating a wing about 13 mm. long and perhaps 4.5 mm. broad. It was received from 

 Rev. Mr. Brodie but without indication of locality or horizon. 



Mesoblattina Bensoni sp. now 



PL 4C, fig. 17. 



An almost perfect wing, being broken slightly at the base. It is very slender, being 

 almost four times as long as broad and of the same shape as M. Blalcei is presumed to 

 be. An under surface is shown. The humeral field is moderate, extending over some- 

 what more than a quarter of the wing. The mediastino-scapular vein is gently sinuous 

 near the base, beyond nearly straight, terminating just above the extreme apex and giving 

 the costal area nearly half the wing; the veins are numerous, slightly elevated, parallel, 

 longitudinally oblique, and in the outer half of the wing always forked to a moderate 

 degree. The externomedian first forks opposite the end of the humeral field, and has ul- 



