S. H. SCUDDEI! ON PALAEOZOIC COCKROACHES. 97 



of its course, terminating a little beyond the mediastinal vein, and 1ms a large number of 

 straight, oblique, crowded branches, simple or deeply forked. 



The length of the fragment is 10. -5 mm.; its. breadth, 13.5 mm. ; probably the length of 

 the wing was about 30 mm., or a little above the medium size, and the breadth to the 

 length as 1 : 2.2. The restored parts in our plate, however, no doubt represent the wing 

 as too broad, the projecting part of the internomedian area being inaccurately drawn. 

 Gohlenberg describes the interspaces as filled with parallel and straight cross lines. If the 

 upper surface is exposed, the wing is a left one. 



It is peculiar for the great width of the mediastinal area, even if we have carried it a 

 single vein too far inward ; and the regularly oppose 1 and straight, distribution of the 

 brandies on opposite sides of the seapular-externomedian interspace, which follows nearly 

 the middle line of the wing, gives it a peculiar aspect. Goldenberg compares it to Her- 

 matobl. lebachensis, but the different position of the scapular brandies, superior instead of 

 inferior, at once distinguishes it from that, not to mention the points referred to by him. 

 It is more nearly allied to Anthr. Bemigii, from which, however, it may be distinguished 

 at a glance by the far less arcuate form and the much greater frequency of the interno- 

 median branches. 



Goldenberg neglects to record this species (of his own description) in his Catalogue of 

 fossil cockroaches (Faun, saraep. foss., ii, 19-21.) 



A single specimen, from the Max coal-pit of Stockheim, Oberfranken. Dyas. 



Gerablattina nov. gen. (y'.pas, Blattina). 



Blatthia Auct (pars). 



The mediastinal vein of the front wing runs parallel or subparallel to the costal margin, 

 and generally rather distant from it, frequently more distant in the middle of its course 

 than elsewhere, and terminates generally beyond the middle of the apical half of the wing, 

 frequently far toward the very apex ; it sends a large, sometimes a very large, number of 

 oblique, straight or curving, usually simple branches to the costal margin. As the division 

 between the scapular and externomedian areas is at or before the tip of the wing (in a 

 single species, G. Mahri, perhaps slightly beyond it), the scapular area is necessarily much 

 restricted ; generally speaking, it is limited to only a few apical branches, which scarcely 

 originate before the middle of the apical half of the wing; and in one or two, such as G. 

 Geinitzi and G. Munsteri, there is only a single apical fork; but in G. Germari and G. 

 weisslana there are several branches, which originate near the middle of the wing: the 

 American species, however, seem to form a distinct section; for notwithstanding that the 

 great length of the mediastinal vein is still retained, the scapular vein begins to branch before 

 the middle of the wing, and emits three or four branches, some of which branch again, and 

 that more than once; the branches of this vein are always superior, whether the extent of 

 the branching be considerable or slight. The externomedian vein is very similar to the 

 scapular, although in some, but not all, of the species in which the scapular area is greatly 

 reduced, it does not suffer to a corresponding extent; in the species placed at the head of 

 the series, as well as in G. Gehufzi and G. Munsteri, it is considerably more extensive 

 than the scapular area, but in the others, including the American species, it is very simi- 

 larly developed ; all the branches are likewise superior, so that the reverse obliquity of the 



MEMOIRS BOST. SOC. NAT. HIST. VOL. III. 13 



