278 On Fossil Arthropods in the British Museum. 



Formica heteroptera^ sp. n. (Formicidfe). 



Anterior wing about 13*5 mm. long ; submarginal cell 2 mm. 



Marginal cell extremely narrow, formed as in Colohopsis 

 stricta (Jerdon) ; submarginal cell small and narrow ; 

 discoidal cell quadrate, higher than long. The following 

 measurements are in fi : — Width (depth) of marginal cell 352 ; 

 upper portion of basal nervure 480 ; lower section of basal 

 nervure (which is arched, and not in a straight line with 

 upper portion) 960 ; discoidal cell on submarginal about 560; 

 lower end of basal to transverso-medial 1120 ; greatest 

 depth of submarginal coll (at level of end of discoidal) 

 about 800. The terminal section of the medius is strongly- 

 arched. 



Bagshot Beds, Bournemouth (/. S. Gardner). British 

 Museum, In. 19035. Tiie reverse is labelled In. 18587, and 

 should come from Creech according to the accompanying list, 

 but this is evidently an error. 



This is a very singular species, combining the characters 

 of Colohopsis and Formica, but in some respects different from 

 both. When better known it may prove referable to a 

 distinct genus. I do not know the venation of the genus 

 Glaphyromyrmex, Wheeler, from Baltic amber. 



Megapteintes (gen. nov.) mirabih's, sp. n. (Pseudosiricida^). 



(Fig. 3.) 



So far as the anterior wing shows, the genus is similar to 

 For^nicium, Westwood, but the first marginal cell is much 



Fig. 3. 



Meyapterites viirabilis. 



hi;;her than long, much narrowed above, bell-.shaped ; the 

 anterior and posterior sides of second discoidal cell are not 

 nearly ])aridh'l ; the transverso-medial has its lower end a 

 little basad of the upper (compare Teredoii) ; the vein Mj 

 leaves second discoidal cell near the lower end of its outer 

 side, and is distinctly arched, as in many ants. The second 



