38 



quam 3"'', paullo longiori ; unguiculis bifidis. Long., 3i 



1.: lat., If 1. 



There are four specimens of this species before me among 

 which I do not find any sexual differences, except tlie basal 

 joint of the hind tarsi a little shorter in one example (pro- 

 bably a female) than in the others. This insect is readily 

 distinguishable among its near allies by the strong and com- 

 paratively sparse puncturation of the whole of its dorsal sur- 

 face. 



Queensland ; Cunnamulla (Mr. Lea). 



Group IV. 

 This group consists of a larger number of species than 

 any of the preceding groups. A small number of its mem- 

 bers can be satisfactorily separated from the rest into a dis- 

 tinct aggregate of species evidently allied among themselves, 

 and presenting characters that are not found in combination 

 elsewhere in the group ; thus — 



A. Clypeus evenly rounded in front. Joint 



3 of antennge at least as long as joint 



2 and considerably longer than joint 



4. Basal joint of hind tarsi not 



shorter than joint 3. Hind coxje not 



or scarcely shorter than metasternum Subgroup I. 

 AA. Not presenting the above characters 



in combination Subgroup II. 



Subgroup) I. 

 (Of Group IV.) 

 The species which I refer to this subgroup form per- 

 haps in Heteronyx the subgroup that best merits the name 

 ''natural" as an aggregate. They are all of large (or at 

 least moderate) size, and also resemble each other in having 

 their dorsal surface very closely punctulate and their clypeal 

 outline regularly rounded. They are somewhat closely allied 

 infer se, and in order to form them into small groups for 

 tabulation it has seemed necessary to rely upon apparently 

 slight characters, but slight though they are, those charac- 

 ters seem to be constant. The form of the labrum presents 

 a valuable character, the upper and lower planes of that 

 organ being, in the four species that I have placed at the be- 

 ginning of the subgroup, particularly distinct from each 

 other, and meeting (their planes more or less at right angles) 

 in a suture-like stria or fine line ; while in the three other 

 species the upper and lower planes of the labrum are not 

 sharply limited, but meet in a more or less rounded manner. 

 The defined line of meeting between the upper and lower 

 planes of the labrum in the former species is, of course, quite 



