MESOZOIC COCKROACHES. 471 



figure to be less crowded than the mediastinal branches, though they are compared by 

 Geinitz to the barbs of a feather. The anal runs to just beyond the broadest part of the 

 wing, being thus longer than the mediastinal, and sends less crowded, gently curved, 

 usually forked, rather short branches to the border. The few anal branches curve and 

 strike the inner margin. 



Length, ;> mm. ; breadth about 2.25 mm. From the Lias of Dobbertin, Germany. 

 The description is drawn up from the data given by Geinitz. 



Pterinoblattina Curtisii sp. nov. 



PI. 48, fig. 16. 



The fragment of only a tip of a wing represents a species apparently about midway be- 

 tween P. chrysea and P. intermixta, approaching the latter in delicacy and multiplicity 

 of its crowded neuration, the former in the disposition of the scapular vein and its 

 branches. It is independent of both in the pointed, almost falcate shape of the tip of the 

 wing. The scapular and median veins and branches are the only ones preserved. The for- 

 mer runs parallel to, and at but a short distance from, the declivous curve of the outer part 

 of the costal margin and sends frequent, longitudinally oblique, apically forked branches 

 to the margin, ending at the extreme pointed tip of the wing. The median veins are 

 numerous, straight, parallel to each other and to the apical portion of the scapular vein, 

 and forked pretty uniformly when about as far from the margin as the width of the 

 scapular area. 



The length of the fragment is 19 mm. ; probably the wing was of twice this length. 

 It comes from the Upper Lias of Alderton, Gloucestershire, England, and was received 

 from Rev. P. B. Brodie. It is named for one of the first English naturalists who inter- 

 ested himself in fossil insects. 



Pterinoblattina intermixta. 



PI. 48, fig. 9. 



Pterinoblattina intermixta Scudd., Proc. Acad. ISTat. Sc. Philad., 1885, 107-108. 



A nearly complete wing of this species has almost the same shape as P. chrysea, but 

 the upper part of the apex is more produced, though not at all pointed as in P. Curtisii. 

 The mediastinal vein terminates before the middle of the outer half of the wing, and the 

 area narrows more gradually than in any of the others; its branches are gently curved, 

 and often forked, but not excessively crowded. Just before reaching the tip of the me- 

 diastinal, the scapular vein suddenly bends toward the apex, running subparallel to, but 

 away from, the costal margin, terminating at the tip and emitting a crowd of curved and 

 forked branches. The closely crowded median branches part at an angle of 45° with 

 the stem, are straight, and fork only just before the tip, forming a tolerably regular belt 

 of crowded veinlets along the margin. The basal branches, however, are interfered with 

 and affected by the anal vein, which is nearly straight, at first running plump against the 

 median branches, curves then downward parallel to these and terminates a little before 

 the mediastinal; it is furnished abundantly with branches curving like its extremity and 



MKMOIKS UOSTON SOC. NAT. BIST.. Vol.. III. 



