1957] 
Brown — Orectognathus and Arnoldidris 
29 
to a very large-headed, broad-jawed soldier form in 
addition to more “normal” workers (e. New South 
Wales, s.e. Queensland) versicolor Donisthorpe 
Inner mandibular borders shallowly but distinctly con- 
cave along basal 2/3 ; worker polymorphism not extend- 
ing to the extreme large-headed, broad-jawed soldier 
form (Tasmania, s. Victoria to mts. of s.e. Queensland) 
clarki Brown 
Literature Cited 
Brown, W. L., Jr. 
1950. Revision of the ant tribe Dacetini: V. The delimitation of 
Arnoldidris new genus (Hymenoptera : Formicidae). Trans. Amer. 
Ent. Soc., 76:143-145. 
1953. A revision of the dacetine ant genus Orectognathus. Mem. 
Queensland Mus., 13:84-104, 3 figs. 
Crampton, H. E. 
1917. (1916.) Studies on the variation, distribution and evolution 
of the genus Partula. The species inhabiting Tahiti. Carnegie 
Inst. Washington, Publ. No. 228. 
1932. Studies on the variation, distribution and evolution of the genus 
Partula. The species inhabiting Moorea. Carnegie Inst. Washington, 
Publ. No. 410, cf. pp. 91-129. 
