MESOZOIC COCKROACHES. 461 



the wing, the shape of the humeral area, the course of the mediastino-scapular vein and 

 the character of its branches, and in the multiplicity of the apical externomedian ner- 

 vnles. It is named in memory of Mantell the English geologist. 



Mesoblattina Hopei sp. nor. 



PI. 47, fig. 11. 



The fragment of a wing representing this species lacks the apical fifth of the wing 

 and a considerable fragment of the humeral region as well as the anal area. It shows 

 the under surface of the wing, which is a little dingier than the dirty chalky-white stone, 

 being uniformly concave tranversely, with the veins slightly sunken on the summits of 

 ridges; although the anal area is gone, the furrow shows slightly prominent as a ridge. 

 As restored in the figure, which seems to indicate its probable form, it was parallel sided, 

 with a scarcely perceptible taper, and probably a little more than three times as long as 

 broad, for the remains of the costal and inner margins are straight and almost parallel 

 and the veins have a very longitudinal aspect. The mediastino-scapular vein was broadly 

 and gracefully sinuous, plainly terminating at some distance before the tip, most of its 

 branches somewhat longitudinally oblique and compound, the costal area being broadest 

 at the end of the basal third of the wing, where it is scarcely less than half its entire 

 breadth. The externomedian and internomedian veins are longitudinal beyond their 

 base, and even, especially the externomedian, swing upward, the division between the two 

 being probably at the very apex of the wing. The anal furrow, roundly bent very 

 strongly before its middle, takes an oblkpie course beyond it, but probably does not ex- 

 ceed the basal fourth of the wing. 



The length of the fragment is 11.25 mm. ; the probable length of the wing 11.25 mm. ; 

 its width 1.75 mm. It comes from the English Purbecks, and is named for Rev. F. W. 

 Hope who has contributed to our knowledge of fossil insects. 



In this vicinity appears to fall another specimen from the English Purbecks (PI. 47, 

 fig. 6) which is too obscure for extended description. It is a nearly perfect wing, showing 

 the upper surface, but being of the same color as the dirty brown stone it is hard to deter- 

 mine the venation excepting in the most general way. In form it appears to resemble 

 rather closely that presumed for M. Hopei, except in being slenderer and having a more 

 acuminate tip. It appears to be more than three times as long as broad, with a large, 

 prominent, sunken humeral field ; a scarcely sinuous mediastino-scapular vein, terminating 

 probably above the apex of the wing and having numerous oblique branches, forming 

 an area which occupies nearty half the wing; longitudinal and closely approximate 

 parallel median veins; and a comparatively small anal area, the furrow not reaching one- 

 fourth the way out. 



Length of wing, 16.7 mm.? ; breadth, 5.5 mm. 



Mesoblattina Peachii sp. nov. 



PI. 47, tig. 10. 



The nearly perfect specimen which represents this species shows the upper surface of 

 a wing, which is a little dusky on a dirty, chalky-white stone. It is gently convex with 



