40 AUSTRALIAN MALACOSTKACA. 



margins with two teeth, situated close together, the anterior low, 

 triangular, blunt, the posterior, occupying the laterial angle, more 

 prominent, triangular, acute. Supra-orbital tooth pointed, pro- 

 jecting slightly beyond the front. Ambulatory limbs compressed ; 

 meropodites of the second, third and fourth pairs with a tooth at 

 the distal end of the upper border ; upper border of the merus- 

 joint of first pair with two small tubercles towards the middle 

 above, that of the second and third pairs each with a single 

 tubercle in the same situation. Abdomen (of male) with lateral 

 fringes of hairs. In other points resembling H'trrooia albo-Uucata. 

 Darnley Island, Torres Straits (Macleay Museum). 



Sub-Tribe Ciclometopa. 



Carapace usually transverse, wide in front, regularly arcuate 

 anteriorly (sometimes quadrate or sub-orbicular), never acuminate 

 or rostrate. Efferent channel, branchiae, male genital appendages 

 and external maxillipcdes as in the OxyrJtyncha. Epistome short, 

 transverse. Internal antennae usually transversely plicate. 



Family I. CAXCIilDJS. 



Carapace usually transverse, often convex with the antero- 

 lateral margins arcuate. The teeth of the margins often obtuse 

 or obscure. Margin of the efferent channel to the branchiae 

 not defined by a longitudinal ridge on either side of the palate. 

 Ambulatory legs all gressorial, with styliform tarsi. [J/.] 



Sub-Family JCanth ince. 

 Internal antenna; more or less transverse. External antennae 

 firmly fixed at their base, the flagellum not excluded from the 

 orbit. Inter-orbital region broad. Digits acuminate or spoon- 

 excavate. 



Genus Cahpilius, Leach. 



Carapace smooth, convex, without trace of divisional lines. 

 Antero-lateral border longer than the postero-latcral, without a 

 prominent margin. Front very often distinctly 4-lobed. Orbits 

 without an external hiatus. Basal joint of the antenna? long 

 and prolonged into the internal canthus of the orbit. Ambulatory 

 legs smooth, cylindrical, not crested. Abdomen of male com- 

 posed of six segments. [D.] 



