BIHANG TILL K. SV. VET. AKAD. HANDLINGAK. BAND. 4 N:0 8. 13 



to the upper börder. On the lower börder it is beset with 

 a close range of long bristles, plume-like ciliated (Pl. III, 

 fig. 78), which are considerably longer than the joint and give 

 it the appearance of an outspread wing. Among these there 

 are, especially towards the foreinost and the hinder angles of 

 the joint, several shorter bristles, irregularly ciliated (Pl. IV, 

 fig. 76), and along thewhole lower börder two ranges of slight, 

 straight, recurved spines. The upper börder carries in its an- 

 terior angle some few fine tactile bristles, cross-bent at the 

 point and with exceedingly short cilia (Pl. III, fig. 39), toge- 

 ther with longer ones similar to those of the preceding joint 

 (Pl. III, fig. 54). On the outer side the joint presents, near 

 its base, a range of five spines, radiating from a common centre 

 and completely similar to the bundles of spines, that arm the 

 outer sides of the laminated artides of the legs (Pl. II, tig. 15). 

 This circumstance, as well as the structure of the long and 

 strong bristles, which arm the lower börder of this joint and 

 which of the foUowing one, indicates that also the inferio ran- 

 tennae are employed as instruments for furrowing or more 

 properly for sweeping away the upper layer of the loose sand, 

 which is in the way of the animal or conceals its food. The 

 fifth and last joint of the peduncle is about half as long as 

 the fourth and half as broad; it is strongly expanded, the 

 upper börder being straight and the lower semicircular. The 

 upper börder carries a few short, thinly ciliated bristles, the 

 lower one is armed with long, strong bristles like them of the 

 preceding joint, and at the foremost end a few hearing bristles; 

 but it totally wants the bristle-armour of the preceding joint. 

 The flagellum consists of 9 — 10 joints, the two first of which 

 are the thickest, the middle ones the longest, and the last one 

 the shortest and straightest. The two first joints carry at the 

 foremost lower angles each its long plume-like ciliated fur- 

 rowing bristle of the same structure as the long bristles at the 

 two last joints of the peduncle, moreover in the foremost bör- 

 der two bundles of 4 — 5 straight feeling bristles of different 

 length and often a little swoUen in the point. The foUowing 

 joints want the long furrowing bristles, but are furnished 

 with similar tactile bristles. The last joint carries in the point 

 two long and three shorter bristles of the same appearance. 



The lower side of the cephalon is occupied by the organs 

 of manducation. The mouth presents at the foremost side a 



