811 



This species is quite distinct from any of the described 

 Australian Crematogasters in the shape of the petiole and the 

 "very pronounced sculpture of the thorax. 



13. Crematogaster xerophila, var. exigua, n. var. 



Worker. — Length, 1'5-1'7 mm. 



Differing from the typical form in its smaller size, in the 

 shorter antennal scapes, which scarcely reach beyond the 

 posterior border of the head, and the differently shaped petiole 

 and postpetiole. The petiole is scarcely longer than broad 

 and a little broader behind than in front ; the postpetiole has a 

 distinct trace of a longitudinal furrow. The median funicular 

 joints are a little more transverse. The head, scapes, and 

 gaster are black, the thorax, petiole, and legs brown, the 

 funiculi yellowish-brown. 



Two workers froin Moorilyanna. 



Subfamily DOLICHODERIDES. 



14. Iridomyrmex detectus, F. Smith, var. viridiaeneus, 



"Viehmeyer. 

 This very handsome variety of one of the commonest 

 Australian ants was recently described from Killalpaninna, 

 South Australia. The body of the worker is deep metallic- 

 green, sometimes with aeneous or violet reflections on the 

 gaster. The mandibles, anterior border of head, antennae, 

 and tarsi are feiTUginous, the legs purplish-red. Among the 

 material collected by Captain White are three workers from 

 the Everard Range, one from Flat Rock Hole in the Musgrave 

 Rangfes, and a dealated female from Todmorden. The female 

 is poorly preserved and very greasy, but seems to agree very 

 closely in size, structure, and colouration with the female of 

 the typical delectus. According to a note accompanying the 

 specimens the nest of the var. viridiaeneus has a slit-shaped 

 orifice. 



15. Iridomyrmex discors, Forel, var. aeneogaster, n. var. 



Worher. — Differing from the typical di.^cors in colour and 

 pubescence. 



The head and thorax are deep-red, the antennae and legs 

 dark-brown, the gaster with bronzy- instead of metallic-green 

 reflections. The pubescence covering the body and appendages 

 is decidedly more abundant, so that the whole surface seems 

 to be more opaque. The head is shaped much as in the type, 

 and is, if anything, a little larger and broader behind, 

 approaching the condition in the subspecies occipitalis ^ Forel, 



