181 



and then narrowed to base; surface with about eight small 

 elevations. Prothorax with six narrow costae from base to 

 apex, the two median ones somewhat incurved at middle, the 

 outer one on each side marginal. Elytra with narrow costae 

 on prothorax; with geminate 

 rows of rather strong punctures. 

 Length, 3-3'75 mm. 



Hab. — Western Australia : 

 Swan River, from nests of the 

 twig-mound ant, Iridomyrmex (J. 

 S. Clark). Type, I. 10651. 



About half of the specimens 

 are of a dingy black, the others 

 vary to a rather light brown, but 

 the apical half of the antennae 

 is usually paler than the basal 

 half, the two shades of colour 

 being frequently rather sharply 

 denned. On the elytra (counting 

 the sutural thickening as the first) the second costa is 

 continuous from base to apex, but near the apex is joined 

 by another representing the third and fourth, these joined 

 together slightly beyond the middle, the fifth is joined to the 

 third at the base, but its apex is free and subapical, the 

 marginal costa is strongly curved at about the basal third ; the 

 sutural costae appear as one, except near the base, where 

 they narrowly diverge. A very slow-moving species, of which 

 Mr. Clark obtained numerous specimens by sieving. It is 

 one of the most interesting of the many curious species recently 

 taken by him from nests of the twig-mound ant. 



MYCETOPHAGIDAE. 



Litargus balteatus, Lee, Proc. Ac. Phil., 1856, p. 14. 



Mr. Froggatt and I obtained numerous specimens of this 

 species in some damp wheat bags at Enfield, near Sydney. I 

 am indebted to Mr. G. J. Arrow for the name of the species, 

 now first recorded as occurring in Australia. 



Eiidarkia cosfata, Lea, 



SCARAB AELDAE. 



BOLBOCEEAS QUADRIFOVEATUM, 11. Sp. 

 PL xxv., fig. 17; pi. xxvi., fig. 44. 



cS . Castaneous, tips of some processes black. Underparts 

 densely pilose. 



Head with a strong, erect, densely punctate central horn ; 

 front face of clypeus semicircular and vertical, each side 

 narrowly carinate, and just before the canthus appearing as 



