822 



■of all four spines would be straight. Ventral surface of 

 petiole distinctly concave. Gaster broadly elliptical, convex 

 above and below, first segment occupying nearly half of its 

 surface. Legs very long and slender; tibiae cylindrical. 



Mandibles lustrous, very finely and densely striated ; 

 remainder of body subopaque ; head, thorax, and petiole very 

 finely punctate-rugulose, the rugules distinctly longitudinal 

 and regular on the posterior portion of the head and on the 

 thoracic dorsum. Gaster and legs very densely shagreened, 

 and covered with small, sparse, piligerous punctures. Hairs 

 yellowish, erect, short, and sparse, almost absent on the upper- 

 surface, except on the clypeus, mandibles, and gaster; very 

 distinct, more abundant, shorter, and bristly on the scapes 

 and legs ; pubescence absent except on the venter, where it is 

 yellowish, long, sparse, and appressed. Black; mandibles and 

 apical halves of the funiculi brownish-red ; legs, including the 

 coxae, brownish-yellow, with the tarsi and basal half of the 

 tibiae black. 



Described from twenty-four workers taken in the Everard 

 Range. 



This species, though apparently related to P. fC.) frog- 

 gattiy Forel, and 'pyrrhus, Forel, is readily distinguishable 

 from these and all other known Australian members of the 

 subgenus, by its regularly dentate (not crenate) clypeus, very 

 long appendages, and the shape of the petiolar and epinotal 

 spines. It appears also to be very distinct in its habits. Like 

 the other species of Gampomyrma, it lives in the ground, but 

 Captain White's photographs show that instead of nesting 

 under stones, like P. femorata, F. Smith, micans, Mayr., and 

 sydneyensis, Mayr., of Eastern Australia, it builds a beauti- 

 fully regular crater, the rounded, exposed surfaces of which it 

 thatches with a layer of mulga leaves. 



31. POLYRHACHIS (CaMPOMYRMa) , Sp. 



A single dealated female specimen, measuring about 6 "5 

 mm., from the MacDonnell Ranges, evidently belongs to a 

 species allied to leae, Forel, or micans, Mayr., but as the 

 females of the great majority of Australian Campomyrmas 

 are quit<e unknown I refrain from describing it at the present 

 time. 



DESCRIPTION OF PLATES. 



\Platcii Ixv. and Ixvi. are from j^hotograph.'i fal-cn hy S. A. ^Yh;fr.'\ 



Plate LXIV. 



Fig. 2. — Several ants' nests, constructed of clay, belonging 

 to a new species, Monomorivm (HolrnmyrmPT) wliitei, "Wheeler. 



