North and South-west Australia etc. 233 



Mandibles large, triangular, the terminal border regnlurly 

 dentate; finely striate. Anterior border of clypeus regularly 

 curved; frontal area indistinct. Head longer than broati, 

 eyes large, placed in the centre of the sides of head, of which 

 they occupy three-quarters; ocelli large and prominent. 

 Frontal carinte short, diverging behind ; scape of 13-jointed 

 antenna3 slightly shorter than the second joint of funiculus, 

 lirst joint of latter as broad as long ; from the second joint 

 of funiculus, which is the longest, the joints gradually 

 diminish in lengtii until the terminal, which is slightly longer 

 than the preceding one. Mesonotum higli and arched, 

 Mayri{\n furrows almost invisible ; scutelUun prominent, 

 lather small, and wider in front ; epinotum longer than broad, 

 with convex sides, only sliglitly narrower behinl than in 

 front. Upper wings with two cubital closed and two dis- 

 coidal cells. Pedicel long and narrow, somewhat cylindrical, 

 only slightly higher behind ; underneath in front is a long, 

 very thin, vertical spine. Gaster a little more than twice as 

 long as broad, first segu eut (or post-petiole) as long as the 

 second, the constriction between them moderately pronounced. 

 Tibise of the two posterior pnirs of legs with two s|)urs, the 

 inner long and pectinate, very shortly so in the middle pair 

 and longer in the posterior pair. Claws bifid. 



Head and thorax coarsely rugose ; on the declivous sur- 

 face of epinotum the rugosities radiate from a central ridge ; 

 node of pedicel transversely striate. First segment of gaster 

 finely striate longitudinally, the lateral stiiai curving inwards 

 and encircling the base ; second segment finely striate trans- 

 versely, the striai having a tendency to curve upwards ; 

 the remaining segments transversely striate. In one 

 specimen the node and gaster are shining, the strias on 

 the former being more feeble, those on the first segment 

 of gaster are only apparent at the sides and base, and on the 

 second segment they are diagonal, tlie central ones almost 

 longitudinal. 



Pilosity sparse and scattered, yellovv ; scapes and tibiaj 

 with erect hairs. 



Chestnut, head and mesonotum darker. 



Darwin, N.T., 1. vi. 13 {FliU). '6 S S • 



As no ^ ^ were captured with these $ <S }^ have riiought 

 it best to describe them provisionally as a new species, and 

 have placed them in the subgenus Rhytidoponera (s. str.), 

 although in the length of the scape and second joint of funi- 

 culus they do not entirely accord with Emery's characters 

 given in the 'Genera Insectorum.'' The number of males 

 known is, however, small. 



