THE HISTORY OF 11 YRM ECOLOGY. 143 



Subfamily V. CAMPONOTIN.E Forel. 



Gizzard with a 4-sepaled straight, recurved or reflected calyx, which 

 however, is always covered with circular muscles that separate it from 

 the cavity of the crop. Pedicel i-jointed. In the worker and female 

 the poison gland forms a flat or oval cushion in the back of the vesicle, 

 with a large tube but without accessory tubules for each cell. Poison 

 vesicle large and elliptical. Sting transformed into a small vestigial 

 apparatus which serves to support the orifice of the vesicle. All the 

 gastric segments visible from above. Terminal segment conical, bear- 

 ing at its .apex the small, round, ciliated cloacal orifice. Anal glands 

 lacking. Pupae usually enclosed in cocoons, but sometimes naked. 



The following tribes are established mainly on peculiarities in the 

 structure of the gizzard. 



Tribe i. PLAGIOLKPIDII. 

 Cosmopolitan but mostly paleotropical. 



Plagiolepis (Fig. 87), Acropyga, Rhizomyrma, Acantholcpis 

 (with subgen. Acantholcpis and Stigmacros), Brach\m\r- 

 mc.\-, Myrmelachista, Mclophorus (with subgen. Mclophorus 

 and Lasiophanes], Notoncus, Aphomomyrmex, Rhopalo- 

 myrmc.r. 



Tribe 2. DIMORPHOMYRMII. 

 Paleotropical. 



D.imorphomyrmex (Fig. 98). 



Tribe 3. MYRMOTERATII. 

 1 'aleotropical. 



Myrmotcras (Fig. 82). 



Tribe 4. CEcopnvLLir. 

 Tropicopolitan. 



(Ecophylla (Fig. 123), Gigantiops, Gcsomyrme.v (Fig. 100). 



Tribe 5. FORMICII. 

 Cosmopolitan. 



Prcnolcpis (with the subgen. Prcnolcpis, Euprenolcpis and 

 Xylanderia), Pscudolasius (Fig. 81), Lasius (with the sub- 

 gen. Lasins, Prolasins and Acanthomyops), Pol\ergus. 

 Formica (with the subgen. Formica and Proformica), 



