120 FOSSIL INSECTS OF THE BRITISH COAL MEASURES. 



The fragment shows a little of a well-curved margin and three veins, one with 

 a small fork on the wing-margin. The curvature indicates that the fragment 

 belongs to the apical end of the wing. 



Hori:oii and Locality— B\nck shale at a depth of 2180 feet in the Barfreston 

 boring, Kent Coalfield. 



Blattojd Wing-Fragment. Plate VIII, fig. 6. 



1915. " Blattoid," Bolton, Trans. Inst. Min. Eng., vol. xlix, pp. 45, 46, pi. ix, fig. 24. 



Specimen. — Distal portion of a tegmen, including the whole of the wing-apex; 

 Museum of the Kent Coal Concessions Company, Dover. 



Portions of the subcosta, radius, and median veins can be determined. The 

 subcosta is represented by a little of the main stem which sends off four simple 

 branches to the outer margin. The radius divides low down into two branches, 

 the outer dividing again into two nearly equal twigs, which pass out to the outer 

 margin of the wing. The inner branch divides into four twigs, all reaching the 

 apical margin. The cubitus is represented by a long vein, giving off a series of 

 eight to nine inward branches. 



Horizon and Locality. — Shales at a depth of 2424 feet in the Stonehall boring, 

 Kent Coalfield. 



Family Mylachid^:, Scudder. 



1879. Scudder, Mem. Bost. Soc. Nat, Hist,, vol. iii, pt. 1, no. 3, p. 40. 

 1906. Handlirsch, Die Fossilen Insekten, p. 258. 



Fore-wings variable in shape, but generally broad and short, nearly always 

 widest at the base. Costal area more or less triangular. Subcosta with branches 

 arising in a radial manner. Radius sending numerous branches outwardly, or 

 dividing into two widely dividing branches. The median either gives off its 

 branches serially, or forms two compound main branches. Cubitus with a variable 

 number of inward branches. Anal area large 1 , with the anal veins usually ending 

 on the inner margin (Handlirsch). 



Scudder established this family for a numerous series of North American 

 Blattoids, all of which are characterised by the subcostal area being widened out 

 basally, and the subcostal vein and its branches reduced from the strap-shaped 

 form seen in Archimylaerids to a shorter structure, in which the branches arise 

 mainly from the root of the vein, and radiate in fan-fashion into the subcostal area. 



The humeral portion of the subcostal area is usually smooth, and destitute of 

 subcostal branches, or where these are present, they are short and do not reach the 

 margin. Owing to the enlargement of the subcostal area, the point of attachment 



