28 Gr. o. saes. [No. 7. 



hang down. They are rather large, strapshaped, and somewhat 

 curved, successively expanding a little distally. The anterior 

 curved edge exhibits about 6 small notches, each having a few 

 very minute hairs; and a tuft of somewhat longer hair is affixed 

 to an angular projection immediately posterior to the extremity. 

 The latter bears a fascicle of rather large sensory filaments, or 

 rather papillae, unequal in size. Moreover, to the outer side, at 

 a short distance from the base, occurs a very small and delicate 

 bristle, projecting anteriorly. 



The antennae are rather powerful in structure, with the scape 

 strongly muscular and forming at the base an elbow-like curve, 

 surrounded by numerous circular folds. To the outer side of 

 this part are affixed two delicate bristles, and from the extremity 

 of the scape, between the insertion of the two branches, a slen- 

 der spine originates. The branches are subequal and about as 

 long as the scape, of a narrow cylindrical form, the lower three, 

 the upper four-jointed. On both branches the last joint is the 

 longest, and tipped with 3 natatory setae and above the set* 

 with a strong spine; the preceding joint has on both branches a 

 single natatory seta affixed to the inferior edge distally. On 

 the lower branch, moreover, the 1st joint bears a much stronger 

 seta, generally recurved along the sides of the body, whereas the 

 corresponding joint of the upper branch is without any seta 

 whatever, being armed at the upper edge only with a small spine. 

 All the natatory setae are finely ciliate and Particulate, the 

 1st joint in some of them produced distally into a short spine. 

 On closer examination, too, one of the terminal setae of the 

 lower branch and two of the upper, are characterised by the 1st 

 joint being finely spinulose at the edges, and not ciliate (see fig. 

 5). As regards the relative length of the natatory setae, that 

 of the 1st joint of the lower branch is by far the longest, that 

 of the succeeding joint of same branch is also rather elongate, 

 though much more slender, whereas the others are considerably 

 shorter and about equal in length. 



The labrum (see fig. 1) is rather large and produced infen- 



