hymexoptera. 37 



123. Formica macrocepiiala. B.M. 



Formica macrocepiiala, Erichs. Wiegm. Archiv (1842), 229, 

 259 ?. 



Hab. Tasmania. 



Subdivision 2. 



Anterior wings with one marginal and two submarginal cells ; 

 the discoiilal cells obsolete. The ocelli usually obsolete in the 

 workers. (Sp. 124-lo8.) 



124. Formica? erythrocephala. B.M. 



Formica erythrocephala, Fabr. Ent. Syst. ii. 351. 6. 

 Atta erythrocephala, Fabr. Syst. Piez. 423. 5. 



Hab. New Holland. 



The typical specimen of the species is in the Banksian Collec- 

 tion ; it is a very slender, attenuated foi'm of a worker ant ; the 

 head is a little wider than the prothoiax, elongate, and of a blood- 

 red colour ; the antenuie red, with the scape obscurely so ; the 

 mandibles porrect and finely denticulate on their inner edge. 

 Thorax elongate, narrowed towards the head ; the legs elongate, 

 slender, and with the knees and tarsi red. The abdomen small, 

 ovate, and subpetiolate ; the scale of the peduncle small, incras- 

 sate, rounded in front, and truncate behind. 



125. Formica intrepida. B.M. 



Formica intrepida, Kirby, Trans. Linn. Soc. xii. 4/7 ? . 



This species is probably the large form of the worker, the F. 

 basalis being the smaller form ; this can only be decided by an 

 examination of a community. F. intrepida has the head, the 

 basal joint of the autennic, and the ai)domen black ; the thorax, 

 scale, and legs red ; the scale is ovate and entire above ; the ex- 

 treme base of the sca))e is red ; the inner margin of the mandi- 

 bles is slightly rufo-pieeous, and armed with six teeth ; the length 

 of the insect from the tip of the mandibles to the apex of the 

 abdomen is 7 lines. 



Hab. Australia. 



126. Formica agilis. B.M. 



Worker. Length 5 lines. — Head and abdomen black ; an- 

 tenucE, thorax and legs ferruginous. Head oblong, rounded 

 behind; eyes ovate and promment, placed backwards on the 

 sides of the head ; the clypeus with a central longitudinal carina, 



