42 FOSSIL INSECTS OF THE BRITISH COAT, .MEASURES. 



neuration is in the form of a meshwork, except in the intercostal area, where are 

 the transverse eross-nervures already noted. 



Much less of the rii/lil irim/ remains than of its fellow, lint sufficient is present 

 to show that the nenration was not quite the same. The median ends in five 

 divisions in place- of six. and the eubitns has seven final branches instead of six. 

 The greatest width of the wing is along a line drawn from the outer margin to the 

 middle of the culiital area on the inner margin, the width being 40 mm. The 

 absence of the apex in each wing is unfortunate, as il renders the outline of the 

 whole wing a little uncertain. The shape of the nodule indicates that very little 

 of the wings is missing, if thev were wholly included in the nodule, as seems 

 probable. The somewhat semicircular inner wing-margin and the short wide 

 wings indicate a. broadly rounded wing-apex. 



. I /////// ii'ft.- The interstitial neuration is much like that of. Hypermegetlte?t. The 

 great width of the wings is a character usually associated with the hind-wings of 

 members of the taimlv l.ithomantuhe, although in this case the wings lack the 

 distal attenuation noticed in the hind-wings of that fa mil v. With Titanodictya 

 i/ii'i/inJn, Scudder, there is a close relationship, both in the general character of 

 the main veins, tlie interstitial meshwork in all areas other than intercostal and 

 subcosta-radial, and in the presence of the same oblique cross-nervnres in the 

 intercostal area in these wings. 



The true systematic position of the genus seems to lie between the Lithoman- 

 tid;e and the genus Titanodictya, and closest to the latter. Because of the greater 

 development of a meshwork neuration between the mam veins, and the limitation of 

 cross-nervures to the intercostal area. I regard this genus as more primitive than 

 any of the Lithomantidie, but closely related thereto. 



Family LITUO.MAXTID.I:, Handlirsch. 

 I'.'IM;. Hiuullirsc'li, Prw. U.S. National Mus., vol. xxi.\, ]>. 073; ulso Die Fossilen Insekteu, [>. s-j. 



This family is closely allied, by wing-structure, to the Dictyoneuridse. The 

 branching of the mam veins has proceeded further than in the DictyoneuridsB, and 

 the body, where it has been preserved, shows striking differences. The family is 

 represented iu the Coal Measures of Great Britain and North America and in the 

 Upper Carboniferous of continental Europe. 



Cem is LITHOMANTIS, Woodward. 



I'^fii. Lithomantis, II. Wood wai'd, Quart, .loiini. <!col. Sue., vol. \x.\ii, [>. <!0. 



it/'in'i'ii- Characters.- l/ar^e insects \\ith iwo pairs of living wings; the hinder 

 pair double the width of the anterior pair. I'rot horax produced into a centra] 



