MESOZOIC COCKROACHES. J 1)7 



Both of them show the upper surface transversely, slightly and regularly arched, with 

 the delicate veins impressed sharply and slight]}' in the basal half of the wing, while in 

 the apical half they run as slight ridges at the bottom of flattened furrows between 

 slight, rounded ridges, the ridges scarcely narrower than the furrows and the passages 

 from one to the other being gradual. One of them, fig. 12, is of the same color, veins 

 and all, as the dirty light brown stone, and has the anal furrow a little more deeply im- 

 pressed than the other veins; the other, fig. 8, is slightly discolored and rests on a dirty 

 chalky-white stone, and the anal furrow is obscure, although apparently impressed no 

 more deeply than the others; where the costal border of this specimen is best preserved 

 it is seen to be narrowly margined. The wings are somewhat more than two and one- 

 half times longer than broad, are broadest just before the middle of the basal half, be- 

 yond which they taper very slightly and regularly to about the middle of the apical half, 

 when, especially by the rounded excision of the inner margin, they narrow much more 

 rapidly and terminate in a somewhat pointed shape, the apex above the middle line of 

 the wing; along most of their course both costal and inner margins are straight or very 

 nearly straight. The mediastino-scapular vein is very broadly and pretty uniformly 

 arcuate, terminating just above the extreme apex of the wing, and, excepting two or 

 three simple ones close to the base, all the branches are arcuate, parallel, oblique and 

 strongly compound, so that comparatively few originate directly from the main stem, 

 while a very large number of crowded nervules reach the margin; at its extreme breadth, 

 about the middle of the wing, the costal area occupies a little more than two-fifths the 

 width of the wing. The externomedian and internomedian veins are broadly sinuous, 

 being almost longitudinal in the middle, pretty strongly arcuate in one sense next the 

 base, and gently arcuate in the opposite next their pretty uniformly forking tips where 

 they curve downward to strike the margin, the externomedian terminating upon the apex 

 and extreme apical end of the inner margin, the internomedian beyond the middle of 

 the inner margin. The anal furrow is a straight oblique line, apparently curving down- 

 ward at extreme tip, in one specimen (fig. 12) terminating at no further than one-fifth 

 of the way from the base, and leaving necessarily an extremely small anal area. 



Length of one specimen (fig. 8) 10.6 mm.; breadth 4 mm.; of the other (fig. 12) 8 

 mm.; probable length of wing 10.1 mm.; breadth 3.75 mm. Both specimens come from 

 the English Purbecks; the species is named for Mr. G. B. Buckton, who, in a recent 

 monograph of British Aphides, has not neglected the fossil species, whether British or 

 foreign. 



*o" 



Elisama Kirkbyi sp. nov. 



PI. 47, fig. 3. 



A wing from which the base and one-third of the tip are lost represents this species, 

 which nevertheless plainly belongs in this genus and is very distinct from the other spe- 

 cies, the neuration being so regular that it could be restored in the missing apical por- 

 tion with high probability of accuracy, though the form of this part is more conjectural. 

 As restored, the wing was pn >l (ably rather more than two and one-half times longer than 

 broad. It represents an under surface, being uniformly concave, and is of the same 



