BY THOMAS G. SLOANE. 107 



Geoscaptus crassus, Sloane. 



This form differs from G. IcBvissinius, Chaud., by size larger, 

 form more convex (particularly of under surface); mandibles with 

 upper surface closely and finely striolate, basal edge of upper 

 surface not extending forward as a ridge; anterior tibiae with two 

 well developed small external teeth above the three large ones, 

 and with upper internal spur wide and rounded at apex (not 

 wide and angulate as in G. Icevissimus); intermediate tibise 

 bispinose externally; posterior tibia? with outer apex raised into 

 a short dentiform spur. Further investigation of the differences 

 between it and Sc. planiuscidus, Macl,, is required, but I do not, 

 from the data available to me, consider these forms identical. 



Hab. — Q. : Cook town District (King's Plains Station; Mr. 

 N. H. Gibson), Townsville (Dodd). 



Geoscaptus plicatulus, Casteln. 



Scarites plicatulus, Casteln., Trans. Roy. Soc. Vict. viii. (1868), 

 p. 143; Chaudoir, Ann. Soc. Ent. Belg. 1879, xxii. p. 138. * 



Chaudoir examined the type of Sc. jAicatulus ; his whole 

 note on it is so short that I translate it fully, as follows : — 

 In Sc. plicatulus, Casteln., the prothorax is a little broader [than 

 in G. cacus\, the clypeus a little more strongly striate, the elytra a 

 little more oval, but I doubt from the single specimen in the 

 Casteluau collection whether it constitutes a distinct species. A 

 specimen found by Mr. R. Helms on the Upper Ord River (near 

 Cambridge Gulf) has the tibial characters of G. cacus, but the 

 facies of G. Icevissimus (though the metasternal episterna are 

 shorter, being shorter than in G. cacus). If we suppose that 

 Chaudoir attached more importance to the tibial characters he 

 used to separate G. Icevissimus and G. cacus than to facies, we 

 may consider this form to be G. 2^licatidus, Casteln. Length 1 2 

 lines {fide Castelnau). 



Hab. — Northern Territory : Escape Cliff (fide Castelnau). 



