128 Proceedings of the Royal Society of Victoria. 



obtuse angle. The sixth is longer than the fifth. The setae are 

 few and unimportant. The flagellum is formed of about 38 

 joints. 



Upper Lip (Fig. 4). — The upper lip is short, the margin evenly- 

 rounded, and distally clothed with a fur of fine setae. 



Maftdibles (Fig. 5). — The mandibles difier from each other in 

 the cutting edge and spine row. The left has two rows of cutting 

 teeth, each of which has six teeth, and a spine row composed of 

 ten serrated spines. The right has only one cutting edge, 

 composed of five teeth, and a spine row of thirteen serrated 

 spines. In other respects they are similar to each other. The 

 molar tubercle is normal. The palp is composed of three joints, 

 the first two extend to the level of the cutting edge, and are sub- 

 equal in form, the second being slightly the longest, and bears 

 distally on its lower margin a row of six spatulate setae, with the 

 mai'gins delicately feathered ; the two at each end of the row are 

 twice the length of the others. The terminal joint is of similar 

 length to the first joint, slightly curved downwards, with the end 

 I'ounded, and bearing three plumose setae, and between them and 

 the distal extremity of the second joint the lower margin has six 

 short, stout, plumose setae. 



Lower Lip (Fig. 6). — The lower lip is large and formed of 

 two lobes, broadly rounded, with their summits and inner distal 

 margins fringed with fine long incurving setae. 



First Maxillae (Fig. 7). — The first maxillae are each composed 

 of two lobes of normal form ; the outer one is broad, its outer 

 margin more than usually convex, and bears on its summit about 

 twelve stout pectinated spines ; the inner lobe is narrow, and 

 reaches to the extremity of the outeu lobe ; its bluntly rounded 

 extremity is thickly covered with long simple setae. 



Second Maxillae (Fig. 8). — The second maxillae are of usual 

 shape. Each consists of a broad basal portion with the inner 

 distal extremity produced into a lobe, which has the inner margin 

 and extremity fringed with long, filamentous, simple setae. 

 Outside this lobe are two narrow lobes (Fig. 8^;) similar to each 

 other, which extend almost to the end of the inner lobe ; they 

 articulate with the basal portion of the summit, and each is 

 tipped by a few very long, finely-pectinated setae. 



