464 SAMUEL II. SCUDDER ON THE 



4. Spiloblattina marginata. 



PI. 41, fig. 3. 



SjnloUattina marginata Sciidcl., Proc. Acad. ]S"at. Sc. Philad., 1885, 37. 



The single specimen (with its reverse) upon which this species is founded, shows the 

 larger and more impoilant parts of the wing, but preserves neither the inner margin nor 

 the tip, so that its form and proportions cannot be determined; it has, however, some 

 mai'ked peculiarities. The mediastinal area is relatively broad with very few, distant, 

 oblique, simple, and nearly straight branches to the main vein, and ends very gradually 

 after the manner of S. gardineri, but opposite the middle of the scapular-externomedian 

 stigma as in S. guttata. The relations of the scapular to the mediastinal vein are as in 

 S. gardineri, but instead of a nearly straight course opposite the stigma mentioned, it 

 actually curves so as to enci'oach upon the space allotted to the stigma, and the branches, 

 forked or simple, never compound, are distant and inequidistant; apparently the vein ter- 

 minates not f\ir above the tip of the wing. The externomedian vein is veiy sinuous and 

 its longitudinal branches, sometimes compound sometimes simple, are more crowded 

 than the others, and very inequidistant, the main vein itself almost colliding with the 

 scapular beyond the stigma. Nothing can be determined of the internomedian or anal 

 veins. The wing differs from the others in having its darker colors concentrated in a 

 narrow mai-gin to all the veins, the paler colors between them forming the real ground 

 color to the wing. 



This species is remarkable for the paucity of its neuration, and for the fact that all the 

 veins and branches are margined with a slender dark edging. The scapular vein re- 

 cedes more than usually from the costal margin opposite the very slight median stigma, 

 and the externomedian vein is consequently more than usuall}^ curved to make place for 

 it. The probable length of the wing was 18 mm. The inner margin being lost, the 

 width can hardly be more than conjectured, but it was perhaps 7 mm. 



One specimen, Nos. 26 and 58. 



Antiiracoblattina Scudder. 

 Anthracoblattina thassica sp. nov. 



ri. 41, fig. 9. 



A single specimen and very fragmentary at that, with its reverse, is pretty plainl}^ ref- 

 erable to this genus, hitherto known only from the carboniferous rocks, but it differs so 

 much from all the known species, which are not many, that notwithstanding its imper- 

 fection I have ventured to name it. It was evidently a lai-ge fore wing, and presents a 

 fragment from the outer half of the apex; it is hardly probable that more than a quarter 

 of the wing appears, and onl}^ the mediastinal and scapular veins. The outer margin was 

 very straight; the apex broadly rounded and roundly angul ate externally. The medias- 

 tinal area wide at base reached to the distal sixth of the wing and had numerous simple 

 or forked, oblique, parallel branches. The scapular vein began to fork not far beyond 

 the middle of the wing, and itself straight and running to the tip of the wing, sent four 

 distant and subcquidistant branches to the margin, the last two simple, the first two com- 



