600 On Aquatic Carnivorous Coleoptera or Dytiscide. 
a margine anteriore ad apicem fere plano, medio longitudinaliter suleato. Lone. 
8, lat. 3 m.m. 
The male has the basa! joints of the front and middle tarsi a little incrassate, and 
well furnished beneath with hairs which are not much elongate, and bear quite 
minute palettes ; the claws on the front feet are curved and rather short, the 
anterior one being thicker than the other. 
North America, (United States, Massachusetts). 858. 
908. Matus (Batrachomatus) wingi, Clk., M.C.—Oblongo-ovalis, depressus, 
nitidus, piceus, antennis pedibusque rufis, capite minus brevi, anterius ferrugineo, 
prothorace ad latera elytrisque vittis duabus longitudinalibus testaceis, his haud 
conjunctis, vitta basali ad Jatera minus approximata ; corpore subleevigato, elytris 
seriebus punctorum sat distinctis; prosterno a margine anteriore ad apicem fere 
plano, medio longitudinaliter sulcato. Long. 73, lat, 32 m.m. 
In the male the basai joints of the front and middle tarsi are slightly incrassate, 
and are furnished beneath with rather short hairs bearing very minute palettes ; the 
front claws are rather short, the anterior one being rather more curved than the 
other. 
Australia, (Port Denison). 859. 
909. Matus daemeli, n. sp.—Oblongo-ovalis, subdepressus, nitidus, niger, antennis 
rufis, pedibus rufo-obscuris ; corpore sublevigato, elytris seriebus punctorum sat 
distinctis; prosterno medio sulcato, processu utrinque ad marginem longitudi- 
naliter impresso. Long. 8, lat. 4 m.m. 
The male characters seem the same as in Matus wingi, except that the 
front claws are simple and similar. 
Although this species is so similar to Matus wingi, that it would probably 
without careful examination be passed over as a mere colour variety thereof, it 
nevertheless is well distinguished by some structural characters ; thus besides the 
difference of sulcation at the sides of the prosternal process, Matus daemeli has the 
coxal lines slightly divergent in front, while they are absolutely parallel in M. 
wingi ; on the other hand the apical portion of these lines is less flexed outwards 
in M. daemeli, so that the form of the coxal processes is a little different in the two 
species. 
Australia, (Sidney). 860. 
