210 Proceedings of the Royal Society of Victoria. 



insti'ucto ; elytris fortiter striatis, striis dorsaliljus fere (prpesertira 

 in parte aiitica) laivibus, striis lateralibus sat fortiter crenulatis, 

 seel pare crenulata quam interstitia manifeste angustiori, inter- 

 stitiis dorsalibus latis planis (lateralibus minus latis sat convexis). 



Long. 24 1. Lat. 8 1. 



Easily distinguishable from all the other Mastochili known to 

 me by inter alia the pair of tubercles immediately behind the 

 clypeus (and projecting over it) being much larger and moi'e 

 conspicuous than any other elevation (except the one at the 

 middle of the base of the excavated area of the head), and being 

 placed so near each other that the interval between them is not 

 more than half the width of the labrum and that they appear as 

 the produced corners of a single lamina rather than as distinct 

 tubercles. 



It is possible that this species is {Passalus) Lottini, Boisd.; but 

 certainly not if that species is identical (as Kaup conjectures) 

 with Plesthenus quadricornis, nor if that species is correctly placed 

 (as in Masters' Catalogue) in Erioaiemis, nor if it has (as 

 Burmeister supposes) a well defined deep longitudinal prothoracic 

 canalicula. 



It should be noted that although the rest of the head is 

 perfectly symmetrical the labrum and mandibles are not quite so, 

 the left side of the former being slightly more prominent than 

 the right, and the left mandible (as usual in the Australian 

 Mastochili) a trifle longer than the right. 



N. S. Wales ; Richmond R. District. 



M. australasiciis ( ? Perch). Modice depressus • nitidus ; ater, 

 abdomine supra ferrugineo ; pygidio, labro, prosterno ad" latera, 

 antennis pedibusque, pilis fulvis plus minusve crebre vestitis ; 

 labro antice leviter emarginato, symmetrico, grosse minus crebre 

 punctulato, sat nitido ; clypeo sat nitido, minus perspicue 

 punctulato, sat crebre ruguloso, utrinque ut dens magnus 

 conicus producto, capitis partibus depressis crebre vix grosse 

 rugulosis ; capite postice (ad partis excavataj basin) tuberculo 

 elongato transverse (hoc in medio fortiter antrorsum producto 

 dentiformi) et ante hunc carina transversa arcuata (hac quam 

 labrum vix angustiori et utrinque tuberculo parvo dentiformi 

 terrainata) armato, tuberculis ad cariniB arcuata? extremitates 

 carina subtili recta conjunctis ; antennis ut M. capitalis ; pro- 



