160 ME. H. BOLTON ON INSECT-REMAINS [Feb. I9II, 



obliquely out, like those of the sub-costa, to the margin. The anal area in the 

 type, Schizoblatta alutacea, is long, attaining nearly half the length of the 

 wing. In the specimen here described the whole of this part is missing, as also 

 a part of the cubitus. The missing portion of the inner margin extends beyond 

 the middle of its length, and with a knowledge of how frequently the anal vein 

 determines the line of fracture, this extended broken area becomes significant. 

 The fact that our specimen does not wholly agree with the definition of the 

 genus, does not invalidate the species, as the definition is founded upon one 

 specimen of the type-species only. Dr. Handlirsch's definition is as follows : — 

 ' Front wing elliptical, about two and two-fifths times as long as broad. Costal 

 area, extending about three-fifths the length of the wing, with about nine or 

 ten normal veins ; not expanded at the base. Radius divided into two prin- 

 cipal stems, the superior of which separates into six branches and the inferior 

 into eight, the majority of the latter ending in the apical border. The media 

 likewise divides into two main stems, the anterior of w T hich forms five branches 

 aud the posterior four, all of which fuse in the apical margin. The eight 

 branches of the gently vaulted cubitus take up the entire inner border. The 

 anal area attains nearly half the length of the wing. Cross-veins area not to be 

 distinguished, but instead there is a fine-grained leathery structure.' (Loc. cit.) 

 I would suggest an emendation, basing the characters of the genus upon 

 the obliquity of the marginal veins of the sub-costa and cubitus, the presence 

 of a wide interval between the former and the radius, and the wide area 

 occupied by the latter. The division of the radius into two unequal branches, 

 together with its symmetrical double bifurcation, is also, I venture to think, a 

 feature of primary importance. 



In the wide divergence of the radius and the media, the specimen 

 here described is in agreement with Scudder's genus Sjoiloblattina ; 

 but in this case the veins do not again converge to enclose an elon- 

 gate or oval area. 



Horizon. — Gwernau Level of the Mynyddislwyn Yein, near 

 Maes-y-cwmmer (Monmouthshire). 



Archimylacris (Etorlattina) hastata, sp. nov. (PL IX. figs. 1-3.) 

 [Reg. Nos. 24501 & 24502.] 



An oblong, broadly elliptical, left tegmen, twice as long as broad : 

 the length of the wing being 33*4 millimetres, and its breadth 

 16*5 mm. A portion of the base of the wing and a considerable 

 portion of the distal and inner margins are missing ; but sufficient of 

 the wing is preserved to make these measurements approximately 

 accurate. The wing has a strong outline, especially along the 

 anterior margin — partly owing to the presence of a broad, shallow, 

 concave depression, which runs almost the whole length of the sub- 

 costal and radial areas, on their outer side, and causes the anterior 

 margin to be reflexed dorsally. Of the inner margin, only the 

 greater part of the anal border is left, although but little of that 

 portion which bounds the cubital area can be missing. The pos- 

 terior two-thirds of the apical margin are gone, the absence of 

 which gives an acute lobate appearance to the wing, negatived 

 by a closer study of the inner margin. In all probability the 

 apex was narrowly and bluntly rounded, more so than is usual in 

 forms of this group — though not wholly unknown, as, for example, 

 in Archimylacris acadica Scudder. 



The most nearly related species appears to be Archimylacris 



