S. H. SCUDDER ON PALAEOZOIC COCKROACHES. 93 



is also somewhat closely allied to the much larger Anthracobl. sopita, from which it differs 

 principally in the unequal width of the mediastinal area, and the form and infrequent 

 branches of the internomedian area. In the form of the latter area, indeed, it differs from 

 all other species of the genus, the course of the internomedian vein in all the others being 

 broadly and somewhat uniformly arched, while in this it is rather strongly sinuous or 

 sigmoid, and has an unusually small number of branches. 



The single specimen known was found in the rubbish at the mouth of the Kaiserschacht, 

 near Klein-Opitz, in Saxony, and, according to Geinitz, is the oldest insect known from the 

 rocks of Saxony. Upper carboniferous. 



[The publication of this species was known to me, by the kind communication of Dr. 

 Geinitz, only after the plates were engraved and the printing of the text well advanced. 

 I have, however, been able to place the species in its proper position in the text, to add a 

 wood-cut, and even to alter all references to the genus where necessary.] 



Anthracoblattina porrecta. PI. 4, fig. 5. 



Blattina por recta E. Gein., Neues Jahrb. f. Mineral, 1875, 6, taf. 1, fig. 4 ; — lb., Neue 

 Aufschl. Dyas v. Weiss., 6, taf. 1, fig. 4 ; — Gold., Faun, saraep. foss., ii, 20. 



Fore wing. The wing is long and narrow, subequal, the costal border strongly arcuate 

 at the base, but beyond very gently convex to the rather broad, well-rounded tip ; the inner 

 margin is broken, but probably nearly straight ; the veins originate at about the middle of 

 the base, and curve gently upward before becoming longitudinal. The mediastinal vein 

 follows very closely the costal margin, but at considerable distance, approaching it very 

 gradually in the apical half of the wing, and terminating only just before the apical sixth 

 of the wing ; it emits nine or ten oblique, straight, generally simple veins, and occupies 

 about one-third the breadth of the wing. The scapular vein has a regular, gently and 

 and broadly sinuous curve, runs subparallel to the costal margin, and terminates at the tip 

 of the same ; it breaks into two shoots just before the middle of the wing, the lower of 

 which emits two apical, superior, simple branches ; the upper, at subequidistant intervals, 

 three straight, superior branches, the basal forked, the others simple, similar in direction and 

 appearance to the apical branches of the mediastinal area. The externomedian vein runs 

 closely parallel to the preceding, and emits two inferior branches, one at the point where the 

 scapular vein divides, which is doubly forked, and the other nearly half way to the margin, 

 which is probably singly forked. The internomedian vein is regularly and rather gently 

 arcuate, and terminates on the inner margin a little before the extremity of the mediastinal 

 vein, and emits four long and very gently arcuate, simple branches at regular intervals 

 from the middle of the basal half of the wing. The anal furrow is distinct, very regularly 

 and broadly arcuate, terminating scarcely before the middle of the wing; the anal veins 

 are simple, arcuate, and apparently distant. 



The wing is a large one, measuring 34 mm. in length, and 12.5 nun. in breadth, the 

 breath being to the length as 1 : 2.7. The only example known is nearly perfect, and if 

 the upper surface is exposed, represents a left wing, whose inner margin is nowhere well 

 defined, the anal field obscured, and an unimportant fragment of the tip missing. As 

 Geinitz says, it is clearly distinct from any other species, and is peculiar for the reversed 

 similarity of the scapular and externomedian veins, which occupy equal spaces on either 



