MANN: ANTS OF THE FIJI ISLANDS. 489 



such closely connectiiifi' forms that one ini<iht consider them all a 

 single species or di\i(le then\ into many. The .schmcltzii group is 

 distinct in the structure of the head, but the epinotum varies from a 

 strongly rounded contour in schmeltzii (typical) and the variety kadi, to 

 a projecting, toothed structure more extreme even than in laminahis. 



Campoiwfus {Myrmecjonia) laminnius in habitus is well defined by 

 its more elongate form, and the dentate epinotum, and the excised 

 upper surface of the node, the latter, however, a variable character, 

 and color, but the variety levuanus approaches cristattis subsp. though 

 it is a much more slender form. 



The Australian species, which have been placed in this subgenus, 

 have the epinotum of the worker compressed, but not to such an extent 

 as in the Fijian forms, but the head of the soldier is not strongly 

 truncate in front, so that it would seem more proper to include them 

 in another subgenus, related to Myrmosaga and Myrmocamelus, 

 while INIyrmegonia includes only the Fijian species and is closely 

 related to Colobopsis, both in the structure of the head in the soldier 

 and in the exclusive twig-dwelling habit. 



Tabic of Species (Workers) of Myrmegonia. 



1. Smaller species. Head concave behind, occipital corners narrowly 

 rounded, sides of occiput between eyes and corners narrow and roundly mar- 

 gined; petiole in profile subcuboidal, elevated in front, with a rather long, 

 slop] ng dorsal surface 2 



Large species. Head convex behind, occipital corners and sides behind eyes 

 broadly rounded. Petiole in profile cuneiform, narrow and margined above . .6 



2. Mesocpinotum not toothed behind; the epinotal base broadly rounding 

 into the declivity 3 



Mesocpinotum impressed behind or with either a tooth or an obtuse angle 

 between base and declivity 4 



3. Femora bright brownish red schmeltzii Mayr 



Femora dark brown to black schmeltzii var. kadi Mann 



4. Epinotum evenly arched, not impressed in profile, projecting behind as 

 a long pointed tooth lauensis Mann 



Epinotum impressed in profile in front of angle between base and declivity, 

 and with a moderately developed blunt tooth or angle 5 



5. Epinotum feebly arcuate in profile, tooth shorter; pubescence very 

 sparse schmeltzii var. loloma Mann 



Epinotum more strongly arcuate in profile, tooth large and broadly triangu- 

 lar; pubescence white, erect, and rather dense on epinotum. 



schmeltzii subsp. trotteri Mann 



