224 WHEELER. 



The four genera of Cerapachyini occurring in Australia may be 

 readily distinguished as follows" 



1. Gaster elongate, cylindrical, the segments separated from each 



other by pronounced constrictions Eusphinctus Emery. 



Segments of the gaster not thus separated 2. 



2. Last antennal joint much thicker and larger than the preceding^ 



joint, forming a one-jointed club; petiole not marginate on sides 



Cerapachys F. Sm. 

 Last antennal joint not enlarged, though longer than the preced- 

 ing joint, and not forming a distinct club 3. 



3. Funiculus of antenna terminating in a 4-jointed club 



Lioponera Ma\'r. 

 Funiculus not terminating in a 4-jointed club; petiole marginate 



on sides Phyracaces Emery. 



The subgenera of Cerapachys are easily distinguished by the number 

 of antennal joints, Cerapachys s. str. having 12, Parasyscia 11, Ooccraea 

 10 and Syscia 9 joints. 



Gotuis Eusphinctus Emery. 



The workers and females of the subgenera, species and varieties of 

 Eusphinctus may be separated by the following dichotomy: 



1. Antennje 11-jointed (Subgen. Eusphinctus) 2. 



Antennje 12-jointed 6. 



2. Length 3.2-4 mm 3. 



Length not more than 3 mm 4. 



3. At least the head, thorax and petiole ferruginous brown; sides of 



postpetiole straight stein heili Forel. 



Color uniformly reddish; sides of postpetiole convex. 



var. hedwigi Forel. 



4. Length only 1.5 mm hackcri sp. nov. 



Length 2.5-3 mm 5. 



5. Pale ferruginous, head, thorax and petiole infuscated above; 



female with rather large, flat eyes. 



steinhcili var. duchaussoyi Ern. Andre. 

 Pale yellowish red; female with minute eyes. .var. cedaris Forel. 



6. Large black species, 7-8.5 mm. long; worker with well developed 



eyes and emarginate pygidium (Subgen. Zasphinctus subgen. 



nov.) turneri Forel. 



Smaller, ferruginous or yellow species; worker eyeless or with 



