84 FOSSIL INSECTS OF TI1K BRITISH COAL MEASURES. 



Family <Ki>isciiin>:i-:, Handlirsch. 



!9nr>. Handlirseh, Pn>r. U.S. National Museum. vol. xxix, p. "lie,. and Die Ko.-,silen Inseki.-n. ].. 14:2. 

 1919. Handlirsdi. Revision der Palao/..isrljen lusekten. p. 39. 



IJ;i(li;il sector coalescing with the main stem of the median, and branching as if 

 a part of (lie latter vein. 



Haiidlirsch regards the family as closelv related to the Sthenaropodidse. 



Goims GENENTOMUM, Seudder. 



1885. lii-in-iiliniiiiiii, Sriiddfi-, Mem. Host. Sue. Nat. Hist., vol. iii, p. 3-j;i. 

 1893. 'AV/sr'/M, liron-mart, Famie Kntom. Terr. Prim. , p. 559. 



Generic Characters. Wings aliout three times as long a^ \\ide ; principal veins 

 and their branches well spaced, and united by a series of straight and well- 

 defined nervures. Apex of wing obtuse. 



Considerable doubt exists as to the true relationship of this genus. Scudder 

 referring it to the Homothetidas, Hrauer considei-ing it to have affinity with the 

 Sialidaj, while Brongniart placed it with the (Mdischiida'. 



Genentomum (?) subacutum, Bolton. Plate V, fig. 4. 



1911. Genentomum snil>in:/itnn>, Boltou, Quart. Journ. C4eol. 8oe., vol. l\vii. p. 33-1, ]>l. \\vii, 

 tiu-s. 18, 19. 



'l'i/jii'. Two small wing-fragments. '.I mm. in length, and <> mm. in bivadth; 

 Bristol Museum (no. ('. ( .>7l'). 



llri::<ni a ml L/ifnl // //. Ijower Coal Measures (<i-'57 feet below the Bedininstei 1 

 (Ireal Vein, and 1:57 feet abo\'e the Ashton (ireat A'ein); South Liberty Colliery, 

 Bristol. 



Description. One wing is partly superposed on the other, and the lower is aUo 

 partially concealed by shale. The upper wing is represented by a portion of the 

 distal inner portion, and bv the wing-apex which is bluntlv rounded. The outer 

 margin is broken away, and the original si/e and shape of the wings cannot be 

 determined. 



The manner in which the wing-fragments are exposed on the shale renders 

 systematic analysis of the neiiration impossible. All the veins are narrow and Mink 

 in the wing-membrane, while the interstitial neuratiou consists of transverse 

 iKTvnres arranged at right -angles, and dividing up the various areas into ipiad- 

 rangles. \\ here forking of the principal veins takes place, the resultant branches 

 first diverge rapidly, and then pass outwards in parallel line's and at right-angles 

 in the margin. 



