11. A. Alien — A South Wales Coal-measure Insect. 67 



Over the areas between the principal nervures there is a delicate 

 Teticnlation. No transverse nervules are present, with the exception 

 of a few faint traces in the costal area. The specimen assumes the 

 colour of the shale in which it is embedded. 



Of the few wings known from the British Carboniferous rocks, 

 those of Lithomnntis carbonnria, from the Coal-measures of Scotland, 

 described by Dr. H. Woodward,' to a certain extent resemble our 

 specimen, but diifer in the shape of the area situated anteriorly to 

 the subcostal nervure, i.e. the costal area, which in L. carbonaria is 

 narrow near the base and increases in width towards the apex, 

 whilst in our specimen the reverse obtains. The difterence in the 

 «hape of the M'ing and in the neuration will not admit of the 

 specimen above figured being referred to L. carbonaria, H. Woodw, 



For corresponding reasons this new specimen cannot be placed 

 with Lithomantis GoJdenbergi, Ch. Brongn.,- notwithstanding the 

 fact that the costal area is somewhat similar in shape. The posterior 

 or branched limb of the radius is situated much further from the 

 anterior margin than in either of the two species of TMliomantis 

 mentioned, and bears fewer branches. 



Gryllacrls (Coryclalis) Brongniarti, Mant., from Coalbrookdale, 

 <liffers from the South Wales specimen in its neuration, especially in 

 the radius, which bifurcates much nearer the apex of the wing, and 

 also in the transverse nervules, which are strongly marked. 



In the simplicity and general appearance of its neuration our wing 

 much resembles Dicti/oneura simiosa, Klivei',-' but in that species the 

 important subcostal nervure is directed towards the apex and does 

 not curve towards the costal margin. M. Kliver's specimen lacks 

 both base and apex, and therefore the above-mentioned character may 

 perhaps be deceptive. 



The genus Foiiquea, to which our specimen may be referred, is 

 <lescribed by Ch. Brongniart,^ who states that " it agrees with 

 Lithomantis in its neuration, but diifers greatly in the reticulation ; 

 the nervules which unite the nervures are so numerous that they 

 anastomose and form a veritable network." 



The shape of the wing, the position of the longitudinal nervures, 

 and the reticulation in our specimen bear a general resemblance to 

 Fouquea Lacroixi, from Commentry, but neither of the two species 

 figured by C. Brongniarf^ exactly agree with it, since in both of 

 them the branches running from the principal nervures to the 

 posterior margin are more numerous. The cubitus also shows 

 a considerable difference. 



The specimen differs from any described form that has come under 

 my notice, more especially in the cubitus. The injui-y to the base 

 of the wing is most unfortunate, and it is consequently impossible 



' Uuait. Jouni. Geo). Sot-., vol. xxxii (1876), p. 60, pi. ix, fig. 1. 



* Rech. Insects Fossilcs, pi. xxxvii, ligs. 1, 2. 



' Pahnontographica, Bd. xxix (1883), p. 260, t. ii, fig. 4. 



* "Rocli. lusectes fossiles dos Temps prim.," p. 372 ; St. Etk-uiif, 1893. 



* Op. cit., pi. xxxv, figs. 10, 11. 



