820 



epinotum is horizontal and only slightly convex, more than 

 twice as long as the sloping declivity into which it passes 

 through a very obtuse angle. Petiole of extraordinary shape, 

 longer than high, anteriorly and posteriorly cylindrical, but 

 surmounted in the middle by a thick node which, viewed 

 from above, is nearly circular, but is diamond-shaped in pro- 

 file, its anterior surface being straight and inclined obliquely 

 upward and forward, the dorsal surface horizontal and very 

 feebly convex, and the posterior surface straight and inclined 

 obliquely backward and downward and parallel with the 

 anterior surface. The ventral surface is almost straight. 

 Gaster broadly pyriform, narrowed, and rather pointed in 

 front. Legs slender ; tibiae cylindrical. 



Opaque, except the gaster, which is distinctly shining. 

 Mandibles very finely shagreened and coarsely punctate. 

 Head, thorax, and petiole uniformly and densely punctate, 

 legs and gaster coarsely, transversely shagreened. Hairs white, 

 long, slender, pointed, and erect, most abundant on the upper- 

 surface of the head, epinotum, petiole, and gaster, somewhat 

 shorter on the scapes and legs. Deep-red ; mandibles and 

 femora more yellowish-red ; mandibular teeth, anterior cor- 

 ners of head, front, and vertex between the carinae and eyes 

 and back as far as the occipital border, articulations of anten- 

 nal funiculi, the whole gaster, basal portions of petiole, coxae, 

 and apical third of femora, black ; tibiae and tarsi reddish- 

 brown, the tips and bases of the tibiae darker. 



Described from two specimens taken at Flat Rock Hole 

 in the Musgrave Ranges. 



This remarkable species, easily distinguished by its 

 singular thorax and even more singular petiole and striking 

 colouration, is quite as difficult as the preceding species to 

 assign to any of ForeFs subgenera of Camponotus. I have placed 

 it in Myrmospliincia with a query because the thorax is 

 distinctly constricted, and because there seems to be no place 

 for it in any of tlie other subgenera. Whether or not 

 it should constitute the type of a new subgenus can be deter- 

 mined only after the discovery of the major worker. 



28. Calomyrmex splendidus, Mayr,, subsp. purpureus, 



Mayr., var. smaragdinus, Emery. 

 A single worker from Flat Rock Hole in the Musgrave 

 Ranges. 



29. Calomyrmex splendidus, Mayr,, subsp. purpureus, 



Mayr., var. eremophilus, n. var. 

 ^yorker. — Differing from the preceding variety in the 

 colouration of the legs and the antennae, which are black 



