16 Mr. T. D, A. Cockerell on Fossil Arthropods 
complete and disc. 1 broadly joins second s.m, There is 
also some resemblance to Xenarcha, which agrees in the 
form of the abdomen much better than Chremylus. The 
marginal cell is different from Xenarcha or Chremylus, but 
nearest to the former. The shape of the first s.m. is as 
in Chremylus. The fossil is provisionally referred to the 
Exothecine Xenarcha, but it probably should form a distinet 
genus. It may perhaps belong to Heterospilus, which it also 
closely resembles. It may also be compared with Hephylus. 
No disposal of it is satisfactory, but I do not like to propose 
a new generic name. 
Bathystomus (?) peritus, sp. un. (Fig. 17.) 
Anterior wing 3°l1 mm. long; thorax with abdomen 
2°2 mm. ; the thorax was apparently dark, the abdomen 
very pale luteous. Wings clear, stigma pale reddish, 
nervures colourless or almost. The wings are large and 
broad, the width of anterior wing a little over 1 mm. 
Abdomen sessile, not compressed. 
Bathystomus (?) peritus, sp. n. 
Stigma large ; second s.m. long, with a broad angle about 
middle above ; b.n. meeting t.-m,, which is in a line with 
its lower end; disc. 1 broadly meeting second s.m. 
B.M., I. 9671 (B.). 
The wing agrees exactly with Bathystomus, except that in 
the modern genus the b.n. goes a considerable distance 
basad of t..m. The abdomen also agrees well enough. 
The wing is much lke that of Histeromerus, but in the 
latter the radial nervure is not angled at the second t.-e. 
Acelius and some Meteorus (M. unicolor, Westm.) run to 
B. peritus in the above table, but are actually very different. 
