59 



FF. Puncturation of prothorax ex- 

 tremely coarse ... ... madeayanus, Westw. 



EE. Base of prothorax not sinuate, — the 



angles not acute ... ... caviceps, Blackb. 



DD. Uppermost tooth of front tibite placed 

 considerably below middle of length 

 of tibia ... ... ... ... atratiiSy Burm. 



CC. Joints of antennal club as long as the rest 



of the antennal joints together . . . fissiceps, Macl. 



BB. Prothorax excised in front of the hind 

 angles. 

 C. Club of antennas three-jointed. 



D. Side of prothorax with a strong angle in 



front of the excision ... ... emay^ginatus, Wa.teTh. 



DD. Side of prothorax rounded at front of 



excision ... ... ... excisicoUis, Blackb. 



CC. Club of antennae five- jointed ... ... ajitemialis, B\a.ckh. 



M. gibbicoUis, sp. no v. Late subovatus minus depressus ; minus 



nitidus ; piceus, antennis testaceis ; setulis brevibus subtili- 



bus minus crebre vestitus ; capite antice triangulariter 



fortiter excise, lateribus sat fortiter bisinuatis ; prothorace 



gibbo fortiter transverso, antice sat angustato, confertim 



rugulose punctulato, lateribus sat fortiter crenulatis modice 



arcuatis, angulis anticis subacutis sat productis posticis 



rectis (vix acute), basi utrinque sat fortiter sinuata ; elytris 



crebre punctulato-substriatis, interstitiis nonnullis leviter 



convexis quam ceteri paullo latioribus ; tibiis anticis extus 



fortiter 3-dentatis (dentibus intervallis sat aequalibus inter 



se divisis) ; tarsorum posticorum articulo basali quam 2"^ 



parum longiori ; unguiculis simplicibus. Long., 4 J 1. ; lat., 



2il. 



This species bears a strong resemblance to M. fissiceps, Macl., 



but belongs to a diflferent section of the genus owing to its having 



no quill -like appendages at the base of its claws. Its clypeus 



scarcely differs from that of M. fissiceps, but inter alia the 



general form of the insect is considerably wider and shorter, the 



prothorax is less narrowed anteriorly and the teeth of its front 



tibise are much larger more acute and more evenly spaced inter se. 



It must also be near M. hidentulus, Fairm. (which has similar 



claws), but that insect is described as a small species (long. 



6 mm.) of oblong form with the sides of the elypeus not sinuate, 



while the present insect is much larger, is of exceptionally short 



wide form, and has the sides of the clypeus strongly sinuate. 



The strong longitudinal convexity of the prothorax (best 



observed by looking at that segment from the side) is a little more 



marked than in M. fissiceps and distinguishes it from most of its 



congeners. 



W. Australia ; Roebuck Bay. Given to me, I believe, by Mr. 

 J. J. Walker. 



