106 S. H. SCUDDEI! ON PALAEOZOIC COCKROACHES. 



tina.- It is related to Gerabl. Geinitzi by the simple structure of the mediastinal vein, and 

 the branching of the internomedian. hut is at once distinguishable from it by the extreme 

 breadth of the mediastinal area, and by the general shape of the wing. In the distribution 

 of the externomedian veins it also resembles Gerabl. producta, but it hardly resembles it 

 in any other feature, unless it be the shape of the wing. The structure of this same vein 

 separates it from all the other species of the genus. Giebel plainly describes the Wettin 

 species, and mistaking the scapular vein for the first branch of the externomedian (since 

 they are united at the base) considers the internomedian as entirely wanting, and suggests 

 that it should therefore form a peculiar genus. 



The single specimen comes from Wettin, Germany. Upper carboniferous. 



G-erablattina producta. PI. 3, fig. 2. 



Blattina euglyptica pars Gold., Neues Jahrb. f. Mineral.. 1869, 162-63, taf. 3. fig. 9 (nee. 8). 



Not Bl. euglyptica Germ, (for which see Etobl. euglyptica). 

 Compare also synonymy of Etobl. Dohrni. 



Fore wing. The wing is rather broad and suhovate, the costal margin strongly and reg- 

 ularly arcuate, contracted at the humeral lobe, the tip well rounded and the inner border 

 nearly straight. The veins originate considerably above the middle of the wing, and are 

 scarcely turned upward at the base. The mediastinal vein, however, curves upward nearly 

 as much as usual next the base, where it is unusually near the costal margin ; but beyond 

 the base it is straight, and follows nearly parallel to the costal margin until past the middle 

 of the wing, when it bends very slightly toward the margin, and terminates in the middle 

 of the outer half of the wing; it emits about eight straight, oblique, mostly simple veins, 

 and the area at its widest is scarcely one-quarter the width- of the wing. The scapular 

 vein is nearly straight from one end of the wing to the other, and terminates just above 

 the extreme apex, separating an upper third of the wing from a lower two-thirds ; com- 

 mencing to divide at the middle of the wing, it emits four straight, obliquely longitudinal, 

 superior branches, the first forked beyond its middle, the others simple. The externo- 

 median vein is also nearly straight, but diverges a little from the preceding beyond the 

 basal third of the wing, and terminates below the tip of the wing, and a little farther from 

 it than the scapular vein ; it commences to branch a little beyond the basal third, and emits 

 about four straight, longitudinal, forked or simple branches at subequal distances all the 

 way to the end. The internomedian vein is somewhat peculiar; straight, or perhaps a 

 little arcuate at the base, it bends downward toward the lower outer angle of the wing in 

 the second fourth of the same, and then takes a longitudinal course nearly parallel to the 

 inner border, which it retains to the end, being throughout this portion of the wing slightly 

 broader than the mediastinal area, or a little more than half the width of the combined 

 internomedian and anal areas near the base ; on account of the length of the apical por- 

 tion of this area, I have proposed the above specific name ; the vein emits about eight 

 simple, oblique, straight, arcuate or sinuous, rather distant branches, the apical ones 

 much more longitudinal than the basal. The anal furrow seems to be lightly impressed, 

 rather gently and uniformly arcuate, and terminates at about the end of the middle third 

 of the wing; the three or more anal veins are similarly arcuate, simple, and unusually 

 distant. 



