88 S. H. SCTJDDER ON PALAEOZOIC COCKROACHES. 



A. dresdensis, diminish in breadth more gradually than usual, the interne-median vein 

 passing in a very gentle curve or a nearly straight line to a point on the inner margin 

 usually beyond that to which the mediastinal vein reaches on the opposite border ; it emits 

 a large number (in A. dresdensis a small number) of either simple or forked, nearly 

 straight veins, of about the same obliquity as those of the mediastinal area. The anal 

 furrow appears to be tolerably well impressed, is rather strongly curved, and usually ter- 

 minates a little more than one-third down the inner margin of the wing ; the anal veins, 

 about half a dozen in number, have a somewhat similar though slighter curve, are nearly 

 parallel, some or all of them simple. 



The wings are stouter than usual, only one of them coming up to the average of the 

 whole group of Blattinariae, the average proportion of the breadth to the length in the 

 genus being as 1 to 2.4. 



Only one of the species of this genus shows anything besides the front wing; this single 

 species is unusually perfect, showing the whole body and the legs as well as both pairs of 

 wings. The body is very slender, but almost equally so, the abdomen being as wide as the 

 rest, but much slenderer than is usual in modern types. The thoracic shield is longitudi- 

 nally oval, and the legs are similar to those of modern types ; whether or not they are 

 spinous does not appear. 



This genus is most nearly allied to Etoblattina, from which it differs principally in the 

 greater size and much greater length of the medastinal area, and the lesser extent of the 

 scapular area; from Archimylacris it is similarly separated, although in one species (A. win- 

 teriana) the termination of the scapular area is somewhat similar, owing to the peculiar 

 conformity of the tip ; from Gerablattina it differs in having the branches of the externo- 

 median vein inferior instead of superior; and from Hermatoblattina in having those of the 

 scapular vein superior and not inferior ; from Progonoblattina it differs in the much more 

 restricted extent of both the scapular and externomedian areas ; from Oryctoblattina in the 

 far less importance and very different nature of the scapular vein, and by the very different 

 character of nearly all the other veins; and from Petroblattina in the nature and distribu- 

 tion of the veins in the externomedian area. 



The species of this genus are altogether confined to Europe, so far as yet known. 



Anthracoblattina spectabilis. PI. 2, fig. 8. 



Blattina spectabilis Gold., Neues Jahrb. f. Mineral., 1869, 161-02, taf. 3, figs. 7, 7", 7 b ; — 

 lb., Faun, saraep. foss., ii, 19; — ? E. Gein., Neues Jahrb. f. Mineral., 1875, 6; — ?lb., 

 Neue Aufschl. Dyas v. Weiss., 6. 



Fore wing. Although the only described specimen of this species is very imperfect, its 

 form is to a great extent known, excej)ting toward the base; the costal margin is regularly 

 and strongly arcuate, while the inner margin is straight; and as the wing tapers rather 

 rapidly in its outer half, the middle of the well-rounded tip is thrown considerably to one 

 side of the middle line of the wing. The mediastinal vein runs parallel to the costal 

 margin nearly as far as the middle of the wing, when it curves somewhat rapidly toward the 

 margin and terminates at about the end of its middle third ; the width of the area is about 

 one-fourth that of the wing, and it is filled with numerous, rather crowded, simple or forked, 

 oblique, straight branches. The scapular vein also runs parallel to the costal margin, and 

 terminates on the apical margin just above the tip, and, being very straight in the apical 



