S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 89 



half of the wing, approaches the costal margin very gradually; it commences to divide 

 before the middle of the wing, and emits at equidistant intervals half a dozen, simple or 

 forked, straight and nearly longitudinal branches. The externomedian follows the course 

 of the scapular vein, and begins to branch at the same point, emitting at unequal intervals 

 four branches, which, with their offshoots, occupy the apex and very extremity of the inner 

 margin of the wing; the first and last of these branches in the specimen described are 

 compound, the others simple. The internomedian vein is gently and regularly arcuate, 

 and emits, in the middle third of the wing, half a dozen branches, the basal ones of which 

 are compound, the apical simple, and all nearly straight or slightly arcuate. The anal 

 furrow is roundly bent where it parts from the other veins, and beyond that straight, prob- 

 ably terminating a little before the middle «f the wing. 



This insect is the largest of the palaeozoic cockroaches, the fragment measuring 43 mm. 

 in length and 22 mm. in breadth ; the probable length of the whole wing was about 

 54 mm., or the breadth to the length as 1 : 2.45. Goldenberg describes the surface as 

 covered with a network of reticulations visible to the naked eye, which near the apex of 

 the wing are formed of transverse, closely approximated, parallel cross-veins, broken into 

 square cells by other fine lines ; while at the base and in the middle of the wing they form 

 an irregular tetragonal or pentagonal network. 



This fine species has no rival in the genus excepting the next to be described, than 

 which it is onlv a little larger. It differs from this, however, in the shape of the wing, 

 which is much slenderer and has a less convex costal margin ; it also has a proportionately 

 shorter mediastinal area ; from its size, it can by no possibility be confounded with any 

 other species of the genus. Goldenberg compares it with Etobl. didyma, from which, as 

 we have seen, it is generically distinct by the inferior origin of the externomedian veins ; 

 but, as he rightly says, it differs from that species in the distribution of the branches of 

 each of the principal veins. Besides being peculiar for its great size, this species is marked 

 by the crowded venation and by the comparative!}' conspicuous reticulation. 



The specimen described came from Lbbejiin, Germany. Upper carboniferous. Geinitz 

 reports the discovery of a specimen at Weissig, Saxony. Lower Dyas; but as he appends 

 to it a query, it may be considered dubious until direct proof is given. 



Anthracoblattina sopita. PI. 4, fig. 8. 



Blattina didyma E. Gem., Neues Jahrb. f. Mineral, 1875, 4-5, taf. 1, fig. 1; — lb., Neue 

 Anfschl. Dyas v. Weiss., 4-5, taf. 1, fig. 1. Not Bl. didyma Germ., for which see Etobl. 

 didyma. 



The fore wing is rather elongated, obovate, the costal border very strongly and regularly 

 arched, the basal two-thirds of the inner margin almost straight, the tip well rounded ; it is 

 broadest in the middle, and narrows almost equally toward both extremities ; the humeral 

 lobe is greatly produced at the extreme base, by its sudden deflection to the root of the 

 wing, forming a rounded subacute angle ; the veins originate rather below the middle line 

 of the wing, and curve strongly upward, following very closely the basal curve of the cos- 

 tal margin. The mediastinal vein runs parallel to the margin over nearly two-thirds of the 

 wing, and then curving toward it, terminates rather beyond the middle of the outer half of 

 the wing ; it emits a large number, a dozen or more, of simple or forked, oblique, and 

 considerably arcuate branches, tolerably distant from one another ; the area occupies nearly 



MKMOIRS BOST. SOC. XAT. HIST. VOL. III. 12 



