500 S. H. SCUDDER ON THE 



8. Costal margin gently curved in the merlins- broad at the base as beyond. 



tinal area, which extends considerably 9. M. Mansfieldii. 



beyond the middle of the wing. 9. Combined mediastinal and scapnl.tr areas 

 5. M. pennsylvanicum. much broader near the middle of the wing 



9. Combined mediastinal and scapular areas as than at the 1 ase. 10. JJ. ovah 



1. Mylacris bretonense. 



Blattina bretonensis Scudd., Can. Nat., vn, 271-272, fig. 1. Figured also in Dawson's 

 Acadian Geology, Suppl. to 2d ed., p. 55, fig. 5. 



Mylacris bretonense Scudd., Mem. Best. Soe. Nat. Hist., in, 41-42, pi. 5, fig. 1. 

 Sydney, Cape Breton. 



2. Mylacris Heeri. 



Blattina Heeri Scudd.. Can. Nat., vn, 272, fig. 2. Figured also in Dawson's Acadian 

 Geology, Suppl. to 2d. ed., p. 55, fig. 6. 



Mylacris Heeri Scudd., Mem. Bost. Soc. Nat. Hist., in, 43-44, pi. 5, fig. 11. 

 Sydney, Cape Breton. 



'■'>. Mylacris antiquum, nov. sp. • 



Front wing. The inner edge is imperfect and a little of the tip is gone, but the rest of 

 the wing, which is remarkable for its approach to Lithomylacris, is pretty well preserved. 

 The mediastinal and scapular areas together certainly occupy the major part of the wing 

 and the externomedian area expands but very little apically ; the wing, however, is broad 

 and full and closely approximates M. Heeri. The humeral lobe is full and angular, with the 

 corner well rounded off, the costal margin scarcely convex beyond the base ; the whole 

 wing was probably a trifle more than twice as long as broad. The veins originate from a 

 little below the middle of the base and curve upward at their start until the}- reach the 

 middle, when they are very nearly straight. The mediastinal area is very large indeed 

 with few and rather distant veins, forking once near the base, reaching the end of the mid- 

 die third of the wing. The scapular area occupies the rest of the upper half of the wing, 

 the vein itself dividing close to the base, the forks again dividing near together in the 

 basal third of the wing, with a still further branching of nearly every ramus halfway to 

 the tip, and again of some near the tip; these branches are all straight except the lowesl 

 near the tip which turn slightly upward, thus throwing all the extremities of the branches 

 above the middle of the tip and giving the scapular-externomedian interspace a slight sin- 

 uosity. The externomedian vein is straight and forks first just before the middle of the 

 wing; each of its branches dichotomizes more or less but without much further divarica- 

 tion, so that the area is more crowded with veins than those above. The interr.omedian 

 area is tolerably large, notwithstanding the considerable size of the anal area, for it reaches 

 well toward the extremity of the inner margin of the wing, sweeping thither in a some- 

 what sinuous curve with unusually longitudinal veins ; in the single specimen the vein lias 

 hut three branches, the middle one forked near its origin, the others simple. The anal 



