BY W. MACLEAY, ESQ., F.L.S. JOQ 



transversal line well marked in the centre. Elytra with a broad 

 depression close to the apex, which is rounded in each elytron, 

 and with eleven light stri^ marked with distinct punctures on 

 each. 



HTDROPHILID^. 



183. — Htdrophilus G-atndahensis. n. sp. 

 Length 12 lines. 

 This species may most readily be distinguished from the other 

 Australians of the genus by the very great length of the sternal 

 spine, which passes the extremities of the posterior thighs. The 

 anterior tarsi, the hairs on all the tarsi, and the palpi are 

 reddish. 



184. — Sternolophus nitidulus. n. sp. 

 Length 5 1 lines. 

 Black, very nitid, convex, and of an elongated oval form. 

 Head with a shallow punctured impression on each side near the 

 eyes, and with a semi-circular row of punctures extending from 

 the anterior part of the eye forwards, and then inwards and back- 

 wards towards the centre of the forehead. Thorax broad, wider 

 behind than in front, with all the angles rounded, and with two 

 transverse punctured lines on each side, one near the apex, the 

 other behind the middle. The elytra are rounded behind and very 

 smooth, but there are faint traces of a few rows of punctures on 

 them. The tarsi and palpi are red. 



Htdatotrephis. n. gen. 



This genus, of which there are a number of species in Aus- 

 tralia, has a general resemblance to Hydrobius. It differs how- 

 ever from that genus in having only 8 jointed antennaB, in not 

 having the posterior tarsi ciliated, and in having the mesosternum 

 prolonged into a tubercle in front of the intermediate thighs. 

 The form of the body is short, oval, and convex. The maxillary 

 palpi are short for the family, and the last joint is not longer 

 than the penultimate. The rest as in HydroMus. 



