172 



and the upper-surface of the latter less conspicuously notched 

 at the sides, legs unarmed and middle femora no stouter than 

 the others. The strongly-inflated middle femora of the male 

 associates the species with tumidus in my table, but the two 

 species are otherwise very dissimilar. 



Articerus constrictiventris, Lea. 



Specimens of this species have recently been taken by 

 Mr. R. J. Burton in South Australia (Murray River) and by 

 Mr. W. W. Froggatt in New South Wales (Hay). The male, 

 hitherto unknown, differs from the female in having the 

 pygidium encroaching upon the under-surface of the abdomen, 

 and this is widely, shallowly, and somewhat irregularly de- 

 pressed along the middle ; the metasternum is convex along 

 the middle, the convexity abruptly declivous posteriorly, and 

 marked at its summit by a short process that is almost con- 

 cealed by golden pubescence, the front tibiae are armed by a 

 minute apical tooth, and the hind ones have a long apical 

 bristle (both middle tibiae are missing from the only male 

 before me). 



Articerus pascoeus, Sharp. 



Mr. E. F. du Boulay has taken several specimens of this 

 species in ants' nest at Beverley (Western Australia). In my 

 table the male is noted as having "front tibiae conspicuously 

 armed at apex." This is the case when both tibiae and tarsi 

 may be seen clearly, but when the tarsi are pressed close to 

 the apical tooth the latter might easily be mistaken for the 

 former. Mr. Clark also took a specimen from the nest of a 

 species of Cremastogasfer near the Swan River. 



Articerus curvicornis, Westw. 



Specimens taken by Mr. F. P. Spry at Ccburg and by Mr. 

 H. W. Davey at Ararat (both in Victoria) differ from the 

 normal form of curvicornis in having the antennae noticeably 

 thinner, the prothorax somewhat wider, with the fovea some- 

 what shorter, and the oral seta of the male shorter, the 

 clothing in general has also a more sericeous appearance ; but 

 I can find no positive characters of the legs that would 

 warrant their specific separation. 



Articerus foveicollis, Raffr. 

 Mr. J. S. Clark has taken specimens in abundance in 

 nests of Iridomyrmex con if era about the Swan River, that 

 probably belong to this species, despite so:ne apparent dis- 

 crepancies. In the description the antennae are noted as 

 "capite plus duplo longiores," and they are so figured; 

 but on the specimens before me, on careful measurement, 



