461 SAMUEL II. SCUDDER ON 



Mesoblattina? lithophila. 



Musca lithophila Germ., Acta Acad. Leop.-Carol., xix, 222, PI. 23, fig. 19; Weyenb., 

 Arch. Mus. Teyl., n, 256-257, PI. 34, fig. 2; Assm., Bericht Vers, deutseh. Naturf. 

 L, 192. 



Blattidium Beroldingianum Heer, Viertelj. naturf. Gesellsch. Zurich, ix, PL, fig. 8. 



Assmann is probably correct in referring Heer's species to the one earlier described 

 by Germar, and it appears probable that it belongs to this genus, though no figures 

 good enough to make it certain have yet been published, and its reference here is only 

 by way of suggestion. 



The upper wings are 16 mm. in length and the species comes from the Jurassic beds 

 of Solenhofen, Bavaria. 



ELISAMA Giebel (emend.) 



Misama Giebel, Ins. Vorw., 320; Scudd., Proc. Acad. Nat. Sc. Philad., 1885, 113. 



Although Giebel misinterpreted the neuration completely, interchanging the costal 

 and inner margins, the species on which he founded the genus form a natural group, to 

 which I am now able to add others; his name may, therefore, be retained. The wings 

 are not so slender, generally, as in Mesoblattina and Eithma, and are more nearly allied 

 to the former, but the characteristics by which that is distinguished from Eithma are here 

 intensified. In none of the species known to me are there any specimens in which the 

 base is completely preserved, but what remains are preserved show, without reason for 

 doubt, that the wings are most peculiar in this very region. There is no sign in any of 

 them of any separate humeral field, so characteristic of Eithma and Mesoblattina, and 

 if it existed it must have been very slight. The anal area is also exceptionally small 

 and unimportant, rarely extending a fifth way down the wing and having a very slight 

 breadth, the anal furrow appearing to be either straight or bent in a sense the reverse 

 of usual, taking rather the direction of the anal angle of the wing. In consonance with 

 this, the median branches and especially the internomedian are more sharply bent than 

 even in Mesoblattina (though some species of the two genera agree fiurly well here) 

 and fill the inner half or more of the wing with longitudinal veins,'so that this region is 

 in marked contrast to the costal with its oblique branches. The median branches seem 

 to be always numerous, and, excepting in one instance, do not reach the border before 

 the distal half of the wing-. 



The genus is tolerably abundant in species, most of which are found in the English 

 Pnrbecks; one, however, doubtfully referred here, belongs to the Swiss Lias. 



Elisama Molossus. 



Blattidium 3folossus Westw., Quart. Journ. Gcol. Soc. Bond., rx, 381 391 PI 15 

 fig. 26. ' ' ' 



JSTethania Molossus Gieb., Ins. Vorw., 321. 



Giebel founded the genus JSTethania upon this single species, upon characters drawn 



