26 Carl Bovallius, 



plumose hair at the lower hinder corner. The fifth joint carries some 

 minute hairs along the anterior margin, and at the lower end. The 

 flagellum is a third longer than the peduncle, the first joint is the 

 longest, about half as long as the last joint of the peduncle, the follo- 

 wing are short, tapering towards the end. 



The mouth-organs are transformed into a projecting tube, forming 

 a powerful boring and sucking instrument. 



The labrum [PI. Ill, fig. 44] forms a long, triangular, open 

 channel, bifid at the lower end, with sharp, tooth-shaped points, exca- 

 vated at the base to afford place for the mandibular palps. 



The mandibles [PI. Ill, fig. 45] consist of a broad, strong basal 

 portion, projecting into a long, single, sharp-pointed, stjdiforra process; 

 at the base of the process it carries a large, stout palp; the first joint 

 of the palp is very short but broad; the second very long, elongate- 

 ovate, with an oblique row of long, simple hairs from the middle to 

 the upper end; the third joint is a little shorter than the second, bor- 

 dered by long hairs along the inner margin. 



The first pair of maxillce [PI. Ill, fig. 46] have the outer lamina 

 reduced, the inner elongate, with four strong teeth at the apex. 



The second pair of maxillœ [PL III, fig. 47] with both laminfe 

 elongate, narrow, carrjång minute teeth at the ends. 



The maxillipeds [PL III, fig. 48] are coalesced into a gouge-like 

 channel, forming together with the labrum the walls of the tube; the 

 two first joints of the right maxilliped are coalesced with the corre- 

 sponding joints of the left one, the inner lamina? are very narrow, 

 concealed by the outer, which are large, hollowed, placed close to one 

 another. The palp is foui'-jointed, as usual, the first joint short, the 

 second, twice longer, equalling the third, the fourth is the longest. 

 The second and third carry long hairs at the exterior ends. 



The pereion. The first segment is long, the longest of all, equal- 

 ling the last two ones together in length, the second to fifth segments 

 are equal, the hinder corners feebly rounded. At the dorsal side of the 

 sixth and seventh segments there is a slight ovate excavation. The 

 surface is hard and smooth, white as ivory. The segments are a little 

 convex longitudinall}^ distinctly separated from one another; the first 

 is somewhat higher than the others. 



The ejnmerals [PL III, fig. 41] are well developed, that of the 

 first segment is long but not ver}' deep, triangular, parti}' concealed 

 by the following, which is enormous in size, triangular, with the upper 



