128 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



all tlie areas of the wings, such as is seen in the British specimen, and as the 

 species agree among themselves while differing from the type of Scudder's genus 

 Necymylacris, I considered them to represent a new genus, as already mentioned. 

 In N. heros Scudder plainly shows an interstitial neuration of closely-packed 

 transverse nervures, which he describes as " a minute tracery of nearly straight, 

 very closely approximated, excessively delicate, scarcely impressed, cross-lines." 



Apart from this difference, there is a close relationship between Necymylacris 

 and Pruvost's Phi/lomylacris. Regarding, as I do, the character of the interstitial 

 neuration, especially when well developed, as one of more than specific importance, 

 I consider that Phylomylacris is a valid genus. 



Genus SOOMYLACRIS, Handlirsch. 

 1906. Soomylacris, Handlirsch, Die Fossilen lusekten, p. 260. 



Generic Characters. Wings short and wide, being two to two-and-a-half times 

 as long as wide. Costal area broadly triangular, the subdivisions of the subcostal 

 arising from a central point, the inner branches only reaching the costal margin 

 after a very oblique course. Radius with distinct radial sector. Median dividing 

 low down into two main branches, while the cubitus is long, with simple or forked 

 branches. Anal area large, nearly as long as the subcostal area, strongly convex, 

 and crossed by numerous anal veins, the first usually thrice divided, both the 

 subcostal and anal areas extending nearly to the middle of the wing. 



Soomylacris deanensis (Scudder). Plate IX, fig. 2; Text-figure 40. 



1895. EtoUattina deanensis. Scudder (in part), Bull. U.S. Geol. Surv., no. 124, p. 34, pi. xii, fig. 1. 



1896. EtoUattina deanensis, Scudder, Geol. Mag. [4], vol. iii, p. 12, fig. 1. 



1906. Soomylacris deanensis, Handlirsch, Die Fossilen Insekten, p. 260, pi. xxvii, fig. 15. 



Type. Right tegmen, lower view, lacking apical portion; U.S. National 

 Museum, Washington (Lacoe Collection, no. H. 21326; Nat. Mus. no. 38090). 



Horizon and Locality. Coal Measures; Foxe's Bridge, Forest of Dean, 

 Gloucestershire. 



Description. Scudder described and figured two specimens from the Forest of 

 Dean under the name of EtoUattina deanensis, but the second is dealt with in this 

 monograph under the new specific name of Soomylacris stocld (see p. 130). 



The type tegmen of 8. deanensis has a length of 25 mm., and a maximum 

 breadth of 13 mm. across the anal area. Scudder gives the length as 38 mm., but 

 the wing has lost a second portion of the apical end since he figured the specimen. 

 The anal area is broken, and has become slightly displaced along the line of the 

 anal furrow, but to so slight an extent as not to hinder measurement. 



