MANN: Wis OF THE II. II ISLANDS. 



149 



carinas short ami curved, their Lobes moderately elevated :iii(l rounded. Eyes 

 rather Bmall, situated at anterior third <>i sides of head. Antennae stout, 12- 

 j» tinted; club elongate, 3- jointed, shorter than remainder of funiculus. Thorax 



without sutures narrower than head, broad in I'ronl narrowed behind, humeri 



prolonged and angulate, inferior angles broadly rounded, dorsal surface Oat. 



Kpinot inn w it h two pairs of spines at sides of basal port ion; declivity dist imt ly 



broader than base and Hat. margined laterally. Petiole short and thick, sub- 

 quadrate, with two small, rounded projections beneath. Postpetiole broad 



and short, Btrongly margined anteriorly. Gaster very short and broad, widest, 

 behind middle of basal segment. Sting not visible. Anterior tibiae with :i 



large and very Btrongly pectinate spine; middle and posterior tibiae without 



spin-: claws simple. Hairs long and very fine. Sculpture coarse. 



Genotype. Archaeomyrmex <-<ic<ii><iu, sp. now 



A distinct genus, which may best be referred to a new tribe, Arehaeo- 

 niynneeini. between the Mynneeini and the Meranoplini, distinguished 

 by the shape of the head, with its margined lateral inferior border, 

 lobed clypeus, absence of antennal scrobes, the stout, flat, triangular, 

 sutureless thorax, the armature of epinotum, the broad, flat declivity, 

 the short, thick, non-pedunculate petiole and the short and broad 

 gaster. 



37. Archaeomyrmex cacabau, sp. nov. Fig. 17. 



Worker. Length 3.75 mm. 



Head broader than long, in profile convex, sides arcuate, posterior corners 

 rounded and rather prominent; occipital border straight at middle and round- 

 ing at <ide<, with an elevated margin in front extending straight and trans- 

 versely across the head. Mandibles stout, the basal border enlarged apically, 

 blades armed with two huge stout triangular teeth at apex and a series of 

 seven broad, rather tuberculate teeth along the basal three fourths. Middle 

 of clypeus in the form of a concave lobe, broader than long and margined at 

 sides, the margins terminating as broadly truncate projections; anterior 

 margin concave, with a large very blunt tooth at middle, the latter minutely 

 excised at tip. Frontal carinae short, little elevated in front, curving and 

 forming an acute posterior margin to the antennal fossae. Antennal scapes 

 nearly attaining occipital angles, gradually thickened apically; first funicular 

 joint thicker than the second and a little longer than broad, second joint much 

 -horter than the third, joints 3-8 subequal in width and transverse, gradually 

 increasing in Length toward apex, joints 9-10 longer than broad and together 

 distinctly shorter than the terminal joint. Byes small (composed of about 

 thirty distinct facets i, situated at anterior third of sides of head. Thorax 

 broad, without sutures, front of pronotum narrowly margined, concave at 



