Australian Coleoptera. 221 



In one of the two specimens before me the antennae are a trifle 

 shorter than in the one described, owing to the last five joints, — 

 and especially the 7th joint, — being less elongated. This is 

 probably a sexual difference. There is a small but distinct 

 impression on the prothorax on either side of the middle line a 

 little in front of the base of the segment. 



N. Queensland ; given to me by Mr. Koebele. 



Dystrigonisthis (gen. nov. Eucnemidarum). 



Corpus minus angustum, postice obtuse angustatum ; clypeus 

 ad basin parum angustatus, antice rotundatus ; carina interocu- 

 laris baud continua ; frons baud carinata ; mandibula modice 

 rugulosa, postice sat recta ; antenna? minus elongativ, fortiter 

 dentatse, articulo 3" quam 4"' sat breviori ; pronotum sat trans- 

 versum, a basi ad apicem arcuatim angustatum, ad basin leviter 

 bisinuatum, angulis posticis minus acutis nullo modo divaricatis ; 

 suturte prosternales vix plane rectte, antice apert;w ; sulci 

 prosternales profundi sat angusti (quam trianguli propleuralis 

 basis quater angustiores, postice clausi, in capite angusti; trianguli 

 propleuralis margo posticus quam externus vix (quam internus 

 circiter duplo, hoc in parte postica solum carinato) longior ; 

 metasternum abdomenque sulcis carentia ; coxarum posticarum 

 lamina in parte basali lata, extrorsum leviter angustata (sicut ad 

 marginem lateralem longior est quam metasterni dimidia pars); 

 pedes minus elongatie ; tarsorum articulus 4"' supra leviter 

 excavato-emarginatus, subtus perspicue productus ; tarsorum 

 posticorum articulus basalis ceteris conjunctis longitudine sub- 

 sequalibus. 



This is a very remarkable genus presenting a character that 

 prevents its falling into any of the smaller aggregates of M. de 

 Bonvouloir's tabulation of Euaie?nid genera. The form of its 

 prosternal sutures and hind-coxal lamella^, the absence of meta- 

 sternal and abdominal sulci, its non-lamellate tarsi, and the 

 presence of a deep prosternal sulcus (which is narrowed on the 

 head), refer it to the large group beginning with Seython and 

 ending with Eucalodemas. But M. de Bonvouloir divides this 

 group into three sections according as the prosternal sulcus is {a) 

 shallow, and confused with the propleural triangle {b) deep and 

 distinct but not separated from the propleural triangle by a 



