S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 101 



been represented upon my plate as magnified slightly less than twice. From Heer's 

 description of the reticulation, probably the upper surface is exposed, and the wing is that 

 of the left side ; all the interspaces, according to Heer, are filled with a very fine network, 

 as in Oryctobl. reticulata, consisting of polygonal cells, forming from two to four rows in 

 each interspace, whence the specific name. 



The species is peculiar for the regular distribution of the branches, parting in a uniform 

 manner on either side of the principal veins ; and for the unusual distinction of the upper 

 and lower branches of the externomedian vein, which take the direction, — the upper of the 

 scapular, the lower of the internomedian branches. In the great breadth, length, and uni- 

 formity of the mediastinal area, this insect resembles several of the species of Gerablattina, 

 but especially G. Goldenbergi and G. Mahri. In the form of the wing it most resembles 

 the former species, from which it is readily distinguished by its larger size, the much greater 

 extent of its internomedian and much smaller extent of its anal area. From Gerabl. inter- 

 media, with which it agrees to a certain extent in the apical division of the scapular and 

 externomedian branches, it is readily separated by the far more crowded neuration and the 

 larger size of the wing. 



. The single specimen comes from the coal-measures of Manebach, in Thiiringen, asso- 

 ciated with leaves of Peeoj)teris arbor escens. Upper carboniferous. 



Gerablattina intermedia. PI. 3, fig. 11. 

 Blattina intermedia Gold., Faun, saraep. loss., ii, 10, 24-25, 51, taf. 1, figs. 10, 10 a . 



Fore wing. The wing is of an obovate form, its regularity only lost by the prominence 

 of the anal angle and the relatively diminished size of the humeral lobe ; the costal border 

 is considerably arcuate, but the humeral lobe so little developed as to be less full than 

 the inner angle ; the inner margin is gently arcuate, and the tip broad and broadly 

 rounded ; the veins originate from about the middle, perhaps above the middle, of the 

 base, and are gently arcuate at their origin. The mediastinal vein, subparallel to and 

 rather distant from the costal margin, turns rather rapidly toward it somewhat beyond the 

 middle of the wing, and terminates in the middle of the outer half of the wing, emitting 

 seven distant, arcuate, oblique, parallel, simple branches ; the area occupies a little less 

 than one-third the breadth of the wing. The scapular vein runs parallel to the costal mar- 

 gin until it branches in the middle of the third quarter of the wing, beyond which it curves 

 toward the margin, and half way to it emits a second and only other branch, which is 

 simple, the first being forked. The externomedian vein, which appears to be coalesced 

 with the preceding in the basal fourth of the wing, runs parallel to the internomedian, and 

 does not fork until it has reached the apical fourth, when it only emits from its upper sur- 

 face two simple, short, and straight branches, which, with the main vein, occupy the tip of 

 the wing, and leave a wide space between the scapular and externomedian veins. The 

 internomedian vein is rather gently arcuate at the base, and beyond nearly straight, in- 

 clined downward, terminating a little before the tip of the wing, and emitting half a dozen 

 or more distant, straight or gently arcuate, simple or apically forked, oblique branches. 



The wing is of medium size, measuring 22 nun. in length and 10 mm. in breadth, the 

 breadth to the length being as 1 : 2.2. If the upper surface is exposed, it belongs to the 

 right side. The anal area is lost, but otherwise the wing is perfect, and in certain places, 



