British Oligocene Ants. 87 



Subfamily Dolichobeminae, Fovel. 

 Tribe Dolichoderini, Emery. 



Genus Dolichoderus, Lund. 



The genus Dolichoderus is very widely distributed now, 

 and occurs in Europe but not in Britain. Only one genus 

 and species of the subfamily Dolichoderinae — Tapinoma 

 erratictim, Latr. — is found in Britain to-day. 



From the Baltic amber Wheeler mentions nine species of 

 Dolichoderus, described from over five hundred and eighty 

 specimens. Cockerell based three species on four specimens 

 that he had before him from ttie Gurnet Bay deposit. The 

 wings of the latter species differ as follows : — In D. brit- 

 annieus the base of the radial cell is vertical and level with 

 the end of the second cubital cell, the latter touching botli 

 the radial and the discoidal cells. In D. anglicus the second 

 cubital cell is petiolate above, not reaching the radial, and 

 also failing to reach the discoidal cell ; I have not found any 

 specimens of this species among my material. In D.ovigerus 

 the base of the radial cell is vertical and practically level with 

 the end of the second cubital cell; the latter touches the 

 radial cell, but fails to reach the discoidal cell. 



Dolichoderus britannicus, Cockerell (1915, p. 483). 



There are fifteen specimens which I refer to this species, 

 some being perfect wings, others complete bodies with parrs 

 of wings, and some only fragments of wings. One dealated 

 female [(a. 22), I. 8695], which is very like OockerelTs 

 figure of a lateral section, may be a small specimen of this 

 species. In one large specimen [(a. 4), I. 10142] showing 

 the lateral aspect, the outline and segments of the body are 

 very clear, but only half the fore wing is present. One wing 

 [(a. 23), II. 279] appears to be a variety, for, though it agrees 

 in all other respects, the base of the radial cell is not level 

 with the end of the second cubital cell, but comes before it. 

 The measurements of the specimens are as follows : — Length 

 4'5-7 mm. ; fore wing, long 6-6'5 mm. ; transverso-medialis 

 to basal corner of discoidal cell *5-*7 mm.; basalis on first 

 cubital *3-*5 mm.; discoidal cell, long '6-*8 mm.; second 

 cubital cell, long '7-1*5 mm. ; radial cell, long 1*7-2 mm. ; 

 first cubital cell on discoidal *5-*7 mm.; second cubital, 

 width at apex *3— "6 mm. 



Oligocene at Gurnet Bay (Brodie, A 1 Court Smith, and 

 Hooley) . 



