242 REVISION OF THE AMVCTERIDES, lii., 



base with only a small obsolete granule. Sides granulate, obsoletely 

 so towards coxa?. Elytra (14 x 7 mm.) elongate, apex tlanged, 

 tlange set with a row of small granules, suture not granulate; disc- 

 between tubercles smooth, noi granulate, with very faint, obsolete 

 traces of seriate punctures; tuberculate, first row with seven or 

 eight large tubercles, rounded l)asally, becoming strongly conical 

 posteriorly, extending from in front of middle almost to apex; 

 second row with eight or nine from base to edge of declivity, basal 

 ones slightly transverse, closer together, posterior ones more coni- 

 cal, third with seven tubercles all conical, fourth with six conical 

 tu))ercles from humeral tu))ercle (which is large and conical) to 

 opposite commencement of third row, thence with four smaller, 

 more obsolete ones; sides with two rows of obsolete tubercles. 

 Beneath smooth, apical segment with a shallow, transverse impres- 

 sion. Prosternal tubercles distinct. Anterior tibise with a strong 

 triangular tooth, one-third of length of tibia from apex. Dlmoi- 

 sions : (J, 22 X 7 mm. 



Hah.—\\e^\. Australia, Shark Bay. 



Probably nearest to 71/. it/signis mihi, but sides of prothorax not 

 explanate, suture not granulate, humeral tubercle large, not the 

 smallest of the row, tibial dentition different, etc. From J/. Schon- 

 herri, which has a similar but smaller tibial dentition, it differs 

 in the non-granulate suture, in the lateral prothoracic tubercles 

 forming a single roAv, and in the much smaller elytral tubercles. 

 From M. Le'uhhardti, it differs in the colour of the tubercles, in 

 their smaller and less spinose shape, and in the prothoracic 

 tubercles in single series at sides and on disc. From M. ohsoletus, 

 the conical, non-Ilattened tubercles will serve (inler alia) to dis- 

 tinguish it. 



Machamycterus obsoletus, n.sp. 

 (Plate xiv., fig. 10.) 

 (J. Large, elongate, subparallel. Black, without clothing, sub- 

 nitid. 



Head and rostrum as in the genus; middle of forehead with 

 the convexitv subcarinate, internal ridges rather strongly de- 



