48 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



Genus PRUVOSTIA, novnni. 



Generic Characters. Fore-wings two and a half times as long as wide ; outer 

 and inner wing-margins almost parallel ; wing-apex well rounded. Subcosta 

 widely removed from the costal margin basally, and apparently not connected with 

 the costa or radius. Radius straight with divergent radial sector. Radial sector, 

 median and cubitus all distally branched Anal veins few. Interstitial neuratkm 

 of straight cross-nervures. 



Certain features of this wing are suggestive of the Protorthoptera, These are 

 the wide basal, intercostal area, the basal origin of the. radial sector, and the 

 remote branching of the radial sector, median and cubital veins. 



It is, however, more nearly allied to Lithosialis than to Metri/in <mlis, Handl., 

 for example, among the Protorthopteroids. The great length before division of 

 the main stems of the radial sector, median and cubitus, their strong divergence, 

 and the many branches of the median, form an assemblage of characters not 

 elsewhere known, and certainly deserving of generic recognition. 



It is with pleasure that I attach to this genus the name of Dr. P. Pruvost, of 

 Lille University, in recognition of his valuable work on the fossil insects of the 

 north of France. 



Pruvostia spectabilis, sp. nov. Plate III, fig. 2; Text-figure 11. 



Type. A left fore-wing; British Museum (Johnson Collection, no. I. 15,894). 



Horizon and Locality. Middle Coal Measures (clay ironstone nodules in the 

 Binds between the "Brooch" and "Thick" coals); Coseley, near Dudley, 

 Staffordshire. 



Fio. 11. Pruvostia spectabilis, sp. nov.; diagram of neuration of left fore-whig, natural size. Coal 

 Measures (clay ironstone nodules in the binds between the "Brooch" and "Thick" coals); 

 Coseley, near Dudley, Staffordshire. Johnson Collection, Brit. Mus. (no. I. 15,894). 



Characters. Outer margin convex at base, and inclining inwards to 

 the apex. Subcosta straight, not reaching the apex of wing. Radius straight, 

 giving off radial sector near base ; radial sector twice branched, median divergent, 

 three times branched, the first two branches forking. Cubitus dividing basally 

 into two, the outer forking three times, the inner branch once. 



Description. A left fore-wing 52 mm. long and 24 mm. wide, almost covering 

 the surface of one half of the median plane of a reddish-brown ironstone nodule. A 

 little of the base of the wing is missing, while a part of the wing-apex is concealed 



