NEW MELOLONTHINI FROM AUSTRALIA 315 



black, the black colour in one of the individuals predominating 

 over the yellow: this dark specimen on dissection proves to be 

 a male, the other two individuals I believe to be females, as 

 they have the apical ventral segment rather shorter. 



Systellopus. 



Antennas 9-jointed, the fourth joint very short and prolonged 

 in front, the last five joints about equal to one another in size, 

 and forming a rather elongate club; head with an impressed 

 rather curved line between the eyes; otherwise without impres- 

 sions or elevations, the clypeus rounded at the sides and in 

 front; the labrum placed on the same level (or plane) as the 

 front of the clypeus, and soldered thereto, but still very di- 

 stinct; it is transverse, with the front angles rounded, and is a 

 little narrower than the clypeus; on its underface it is longi- 

 tudinally thickened along the middle. Mandibles concealed, short, 

 stout at the base, but with the anterior portion laminate and 

 truncate at the extremity ; the base on the inside^ with a small 

 molar tooth which has only two ridges. 



Mentum rather broad, its extremity in the middle pointed, 

 but a little curved upwards towards the ligula; ligula distinct 

 and rather large in proportion to the mentum; labial palpi evi- 

 dently inserted between the upper face of the mentum and the 

 lower one of the ligula, rather widely separated from one ano- 

 ther, short and stout, apparently only two jointed, the first of 

 the two joints very short not reaching beyond the extremity of 

 the ligula, the 2. nd rather long, at the extremity slightly curved 

 inwards. Maxillae with the support of the palpi largely developed 

 (nearly as long as the palpus), the lobes apparently absent, 

 but probably soldered to the inside of the support, the upper 

 one terminating in a shining, hairless process, from which pro- 

 jects inwardly a small obscure black tubercle or tooth: palpi 

 stout and rather short, the first joint more slender than the 

 others, 2. nd narrow at the base, broad at the extremity, 3. rd 

 shorter than 2. nd , 4. lh about as long as the two preceding to- 



