600 On Aquatic CaniiroJV.iH Coleoptcra or DylisciJce. 



a margine anteriore ad apicem fere piano, medio longitudinaliter sulcato. Long. 

 8, lat. 3» lu.m. 



The male has the basal joints of the front and middle tarsi a little incrassatc, 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. 



90S. Matus (Batrachomatus) wingi, Clk., M.C. — Oblongo-ovalis, depressus, 

 nitidus, piceus, antennis pedibusque rufi-^, capite minus brevi, antei'ius ferrugineo, 

 prothorace ad latera elytrisque vittis duabus longitudinalibus testaceis, his hand 

 conjunctis, vitta basali ad latera minus approximata ; corpore subhevigato, ehtris 

 seriebus punctorum sat distinctis ; prosterno a margine anteriore ad apicem fere 

 piano, medio longitudinaliter sulcato. Long. 7f, lat, 3f m.m. 



In the male the basal 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, autennis 

 rufis, pedibus rufo-obscuris ; corpore subltevigato, 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. 



Althouo-h 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 difterent in the two 

 species. 



Australia, (Sidney). 8G0. 



