NO. 2119. BRITISH FOSSIL INSECTS— COCEERELL. 485 



LEPTOTHORAX GURNETENSIS, new species. 

 Plate 65, figs. 4-5. 



Anterior wing about 2.6 mm. long; venation nearly as in modern 

 Leptothorax canadensis, but transversomedial nervure much more 

 remote from lower end of basal nervure; first discoidal cell very small, 

 measurements in /x: Upper end of transversomedial to lower end of 

 basal nervure, 400; lower side of first discoidal, about 145; length of 

 submarginal cell, 672. 



Variety a: First discoidal cell larger, its lower side 200 m- Proba- 

 bly an individual variation. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7546; var. a, 

 7604 (Cat. No. 61418, U.S.?:.M.). This seems to be a Leptothorax, but 

 I have only the wings to judge from. 



Wheeler records five species of Leptothorax from Baltic Amber. 

 The variety a, with larger discoidal, and submarginal cell narrowly 

 truncate at end, may possibly be a distinct species. 



Holotype.— Cat. No. 61417, U.S.N.M. 



OECOPHYLLA ATA VINA, new species. 



Plate 64, fig. 7. 



Female. — Length 5.5 mm.; the long petiole and short broad 

 abdomen as in Oecophylla; anterior wing shghtly over 7 mm. long; 

 stigma long and slender, marginal cell very narrow; submarginal 

 cell, which is 1,890 n long, narrowly truncate at end; greatest depth 

 of submarginal cell 800 /x; basal nervure considerably longer (450 n) 

 on submarginal than beyond, its lower section only 320 fx (reversing 

 the condition in 0. perdita); lower end of basal nervure 720 n from 

 transvasomedial. 



Ohgocene at Gurnet Bay (Brodie). Lacoe Coll. 7560, and the 

 reverse 7569. 



Holotype.—Csit. No. 61419, U.S.N.M. 



OECOPHYLLA PERDITA, new species. 

 Plate 64, figs. 5-6. 



Female. — Anterior wing 12.75 mm. long; venation essentially as 

 in 0. atavina, except that the basal nervure has its lower section 

 longest and the submarginal cell is pointed at tip. The following 

 measurements are in microns: Upper section of basal nervure (on 

 the submarginal), 640; lower section of basal nervure, 880; lower 

 end of basal nervure from transversomedial, 1,760; greatest depth of 

 submarginal, 1,520. 



Female. — Variety a (probably an individual variation). Wing 

 about 11 mm. long; base of stigma to base of wing nearly 7.5 mm., 

 submarginal cell narrowly truncate at end. (The difference in the 

 end of the submarginal, between this and the type, is not likely to 



