Austral id ii Oistelidae. 77 



margin. Scutellum widely rounded behind, finely punctate. Elytra 

 wider than prothorax at base, and more than three times as long. 

 finely pointed at apex, striate punctate, the punctures in striae less 

 defined and mure irregular than in T. minor, the intervals convex, 

 and more distinctly and closely punctate than in that species. 

 Underside rather finely and distantly punctate, mid-tibiae curved, 

 legs simple, femora tumid, posterior tarsi with basal joint as long 

 as the rest combined, $ with distinct anal clasping appendage. 



Dimensions. — cf 9-11 x 2.6-3 nun., J 13 x 4 mm. 



Habitat. — Dorrigo (Tillyard), Tambourine Mountain (Hacker). 

 Blue Mountains (Dr. Ferguson). 



Five examples. Both this species and T . minor differ from the 

 typical Tanychilus (striatus and splendens) in the wider and flatter 

 forehead, and in the less subconic form of the prothorax, with the 

 anterior part less constricted and rounded (in section). In these 

 respects they form a link between Chromomoea and Tanychilus. 

 The filiform and elongate antennae, very large eyes, head wider 

 than apex of prothorax, the latter not cylindric or oblong, justify 

 their inclusion under Tanychilus unless another ill-defined genus is 

 to be founded for their reception. The type S in the Queensland 

 Mus., the 9 in the author's coll. 



Group II. Mandibles bifid at apex, head little produced. 



1 19 Winged. 



2 Mandibles grooved (scarcely bifid) at apex (one sp. one pointed?) 



Dimorphochilus, Borclr 



3 25 Mandibles distinctly bifid at apex 



4 14 Hind femora much longer than the distance from their base to 



the external margin of the elytra. 



5 12 Head much narrower than apex of prothorax 



6 9 Antennal joints more or less elongate and slender 



7 13 Elytra striate punctate 



8 Eyes, in general, more or less widely separated Homotrysis, Pase 



9 Eyes large and approximate in £ Hybrenia, Paso 



10 14 Antennal joints short and widened at apex 



11 Upper surface metallic, colour dark nypsius, Champ 



12 Upper surface non-metallie, colour yellow Jophon, Champ 



13 Head scarcely narrower than apex of prothorax 



Ommatophorus, Mac! 



14 Elytra finely striate, prothorax as wide as elytra 



Barycistela, Blackb 



15 19 Hind femora scarcely longer than the distance from their base 



to the external margin of the elytra 



16 Body very convex and oval (facies of Cholera) Nocar, Blackb 



17 19 Body more depressed, elytra parallel on basal half 



18 Head very narrow (facies of Harpalides) Scalefmnerus, Blackb 



Otys, Champ 



