NO. 5.] ACCOUNT OF THE SPECIES. 117 



The posterior antennae (fig. 4) form each a very slender stem abruptly 

 bent in front of the middle. This stem, as in Onccea, consists of only 3 

 joints, the 1st of which constitutes the basal part, the other 2 the inner 

 ramus, the outer ramus in this instance being also quite obsolete. The basal 

 joint is quite unarmed, and but slightly dilated distally. The 2nd joint is very 

 small, and carries anteriorly a very delicate bristle. The 3rd joint is slender 

 and elongated, fully as long as the other 2 combined, and is narrow linear 

 in form. It has the posterior edge finely ciliated, and carries anteriorly 2 

 small bristles, separated by a long interspace. From the obtusely rounded tip, 

 6 comparatively short, anteriorly-curving bristles issue close together, and 

 immediately inside them, 2 other bristles are attached to a separate ledge, 

 one of them of considerable length. 



The mandibles (fig. 5) agree with those in Onccea in the total absence 

 of a palp. Otherwise, however, they are rather different, and more resemble 

 in structure those in the parasitic genus Ldchomolgus. As in that genus, 

 they each terminate in a falciform lappet bordered along the convex edge 

 with a finely serrated rim, and exserted to a thin flexible point, which pro- 

 jects far into the buccal cavity. Outside this lappet, a straight spine of 

 no great size, and 2 falciform setae are attached, and at this place the 

 mandible is clothed with a number of delicate hairs. 



The maxillae (fig. 6) are very small and simple in structure, each termi- 

 nating in a conical prominence, tipped with 2 unequal ciliated setae, and 

 having a thin plate outside, carrying 3 likewise ciliated setae. This plate 

 seems to answer to the palp, and is well-defined at the base. 



The anterior maxillipeds (fig. 7) exhibit each a broad and muscular basal 

 part, and an incurved, biarticulate terminal part. The 1st joint of the latter 

 carries inside a strong, slightly curved spine, closely dentated along the 

 convex edge in a comb-like manner, and opposite to it a slender ciliated seta. 

 The 2nd joint has 2 comparatively short apical spines, the outer of which is 

 dentated in a similar manner to the inner spine of the 1st joint. 



The posterior maxillipeds (fig. 8) are rather powerful, and, as in Onccea, 

 pronouncedly prehensile, consisting of a short basal joint, an oval dilated 

 hand, and a slender, claw-like dactylus, which admits of being impinged upon 

 the latter. Both the basal joint and the hand are quite unarmed, whereas in 

 the other 2 species, the palmar edge is divided into a number of dentiform 



