124 FOSSIL INSECTS .OF THE BRITISH COAL MEASURES. 



Affinities. — The fragmentary and crumpled condition of this wing makes its 

 elucidation difficult and unsatisfactory. The chief features distinguishable are the 

 almost equal costal and anal areas, the presence of a radial sector, and the origin 

 of several anal veins arising from one stem. Few though these characters be, they 

 are sufficient to refer the specimen to the Mylacridas, and to the genus Hemimylacris. 



Genus PHYLOMYLACRIS, Pruvost, 



1919. Phylomylacris, Pruvost, Faune Continent. Terr. Houill. N. France (Mem. Explic. Carte Gcol. 

 France), p. 199. 



Generic Characters, — Tegmina semi-ovate, with rounded apex. Surface coria- 

 ceous, with a fine close meshwork of interstitial nervures giving a shagreen-like 

 appearance. Wing-attachment in middle of wing. Costal area triangular. Sub- 

 costal branching, partly pectinated and partly radial, extending beyond the middle 

 of the wing. Radius well developed. Median with numerous branches. Cubitus 

 large and well branched. Anal area large, convex, and crossed by numerous 

 anal veins. 



Pruvost has formed this genus to include certain Blattoids found in recent 

 years at Lens and Lievin in northern France. They possess a superficial 

 resemblance to the type-species of Necymylacris, X. heros, Scd., but their 

 differences are nevertheless so marked as to justify the formation of a new genus. 

 Pruvost in the work in question placed Goldenberg's Blattidium mantidioides in 

 the genus Arcliseotiphe, having at the time only the original drawings of Kirkby 

 to rely on. After borrowing the type-specimen, I came to the conclusion thai 

 Goldenberg's species must be referred to a new genus, in which I also placed 

 Necymylacris villeti, Pruv., A. lafittei, Pruv., and N. godoni, Pruv. To this new 

 genus I proposed to attach the name of my French friend, Dr. P. Pruvost, and 

 intimated my intention to him, at the same time sending my manuscript. 1 received 

 a reply and the proof-sheets of his new work, in which it appeared thai lie also had 

 recognised that the three species previously referred to Necymylacris must be 

 placed in a new genus, to which he had already given the name of Phylomylacris. 

 Our conclusions were identical as to the generic value of his species, and as his 

 work antedates my own, 1 am unable to attach his name to the new genus, but 

 must adopt the generic name of Phylomylacris for the British species. 



Had Dr. Pruvost received my photographs and drawings earlier, he would not 

 have referred J!, mantidioides lo the genus Archseotiphe, but to Phylomylaciis, as 

 he based the characters of the hitter on the same details of structure ;is I had 

 determined for the genus in which //. mantidioides should be placed. The fact 

 that we arrived at the same conclusion, and by the selection of the same structures, 

 has been a satisfaction to both. 



