British OUgocene Ants. 87 



Subfamily Dolicsodeminaje, Forel. 

 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 D jliclioderinae — Tapinoma 

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



From the Baltic amber Wheeler mentions nine species of 

 Dolic/ioderus, described from over five hundred and eighty 

 specimens. Cockerell based three species on four specimens 

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

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

 annicus the base of the ra^lial cell is vertical and level with 

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

 tlie radial and the discoidal cells. In Z^. 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 . ovigenis 

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

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

 radial cell, but fails to reach the discoidal cell. 



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



There are fifteen specimens wliich I refer to this species, 

 some being perfect wings, otliers complete bodies with pari.s 

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

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

 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, tlie outline and segments of the body are 

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

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

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

 with the end of the second cubit \1 cell, but conies before it. 

 The measurements of the specimens are as follows : — Length 

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

 to basal corner of disctndal cell '5-7 mm.; basalis on first 

 cubital '3-5 mm.; discoidal cell, long 'G-'S mm.; second 

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

 first cubital cell on discoidal 'S-"? mm.; second cubital, 

 width at apex "S-'G mm. 



Oligocene at Gurnet Bay {Brodie, A'' Court Stnith, and 

 llooley) . 



