74 RKVISIOX OF THE AMTCTERIDES, vi., 



being in single rows on all the interstices perhaps affords a better distinction. 



The female type in the South Australian Museum has also been examined. 

 It differs from the male commented on above, whieh was from Palm Creek 

 (National Museum) in being smaller and more ovate. The crests had smaller 

 but distinct dentations, and the lateral prothoracic tubercles were narrower and 

 more sharply conical. 



From A. tnaximns, it may bo distinguished by the arrangement of the elytral 

 granules, but both A. hiackburni and A. graiuilatus differ from A. maximus in 

 their more slender Acantholophtcs-hke form. 



ACANTHOLOPHUS MAXIMUS Macl. 



Cubicorrhyvchus ma.iimus Macl., Trans. Ent. Soc. N.S. Wales, i., 1865, p. 294. 



c?. Of moderate size, robust. Black, with verj' scanty grey clothing. 



Head conves above, concave in front and with longitudinal and oblique ridges 

 converging on apex and separated by deep grooves, with two small granules about 

 middle; sepai-ated from rostrum by a deep transvei-se groove bifurcate at ends; 

 supraorbital crests stout, obtusely bidentate, the posterior fork of the transverse 

 apical groove running up the inner side of crest between the two portions, the 

 anterior fork running between crest and the end of the lateral margin of the 

 rostram. Rostnim short and wide, the upper surface rather deeply concave, 

 without internal ridges or basal foveae; lateral margins strongly raised, almost 

 rectangulate in front and sinking suddenly at base. Antennae comparatively 

 short; first joint of funicle noticeably longer than second; club rather stout, 

 elongate. Prothorax subquadrate, gently rounded on sides; apical margin feebly 

 rounded above, not produced over head, ocular lobes absent; disc gently convex, 

 not explanate, uniformly and closely set with moderately large distinct granules; 

 median line rather shallowly impressed, submedian tubercles absent except for 

 small basal pair; lateral tubercles represented by two small dentifonn projections 

 anteriorly and one or two smaller more indefinite ones posteriorly. Sides granu- 

 late, the granules becoming obsolete below. Elytra broad, gently rounded on 

 sides, base slightly emarginate, humeral angles marked by a small tooth; disc 

 striate-punctate, the punctures open, often confluent laterally, giving elytra a 

 somewhat wrinkled appearance: interstices closely set with moderately large 

 gi'anules, round at base, but conical posteriorly, for the most i)art in single series, 

 but duplicated on basal portions of second, third and fourth intei-stices . Ventral 

 segments transversely convex, the basal segments rather feebly concave; without 

 evident punctures except for a few at extreme apex. Legs short and stout; 

 femora somewhat flattened with transverse impressions; tibiae short and stout, 

 with rather strong yellow setae, larger on the under surface; tarsal joints shorter 

 and broader than usual. 



2. Very similar to d", somewhat more obese; venter more strongly convex; 

 legs somewhat) longer. Dimensions: c?. 14 ^ 6 — 17 x 7 mm. ; ?. 17 X ^ — 20 X 8 

 nun. 



Hob. — Western Australia: King George Sound, Swan River, Mundaring, 

 Conjerdin, Gooseberry Hill, Kalgoorlie, Cue. 



The type of this species, which is in the Macleay Museum, is a female, and 

 agrees exactly with the female from Mundaring described above. 



The series before me shows some considerable variation in size and in the 

 lateral prothoracic tubercles. These tend to become distinctly larger, and in 

 specimens from Cue there is an additional tubercle tilling the gap between the 



