1:21. FOSSIL IXSFCTS OF T1IK BRITISH COAL MEASURES. 



s. The fragment;) IT 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 Mylacridge, and to the genus Hemimylacris. 



Genus PHYLOMYLACRIS, Pruvost. 



1919. Phylomylacris, Pruvost, Fauiie Coutineiit. Terr. Houill. N. France (Mi'ni. Explic. Carte Gi'ol. 

 France), p. 19'J. 



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

 ceous, with a line close mesh work 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, lladius well developed. Median with numerous branches. Cubit us 

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

 anal veins. 



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

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

 resemblance to the type-species of T'r////;///"o'/X \. In-rux, Scd., but their 

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

 Pruvost in the work in question placed Goldenberg's Blattidium mantidioid.es in 

 the genus . I /v/oW/yjA,', having at the time only the original drawings of Kirkby 

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

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

 Necymylacris rilli'ii, 1'ruv., .V. Injiffri, Pruv., and X. i//nl<>ni, IVuv. To this new 

 genus 1 proposed to attach the name of my French friend, Dr. I'. I'ruvost, and 

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

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

 recognised that the three 1 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, I am unable to attach his name to the new genus, but 

 must adopt the generic name of /'///////////</<//* for tin' Kritish species. 



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

 have referred //. inantidwides lo the genus Arcliseotijjhe, but to Phyloinylacris, && 



lie based the characters of the latter on the same details of structure .'is I had 

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

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

 has been a sal isl'act ion to hot h. 



