322 Mr. Frederick Bates on 



in front, and gradually tapering behind ; * maxillary 

 palpi very long, haii-y, last joint elongate, cul triform ; 

 mandibles thin, rather strongly curved near their ex- 

 tremity ; bifid at the end, the prongs of unequal length, 

 sharp and pointed ; lahrum transverse, strongly notched 

 in front, fore angles broadly rounded, thence rather 

 sharply contracted to the base ; attached to the epistoma 

 by a semicorneous hinge ; head rounded behind the eyes, 

 then suddenly contracted into a rather long cylindrical 

 neck ; cheeks prominent ; epistoma short, broadly trun- 

 cate and sub-sinuous in front, sides sub-parallel, or 

 slightly widening behind, separated from the front by a 

 well-marked transverse impression ; eyes large, promi- 

 nent, transverse, approximate above, narrowed below, 

 hind margins sinuous, slightly notched in front for the 

 reception of the antennary auricles (= "oreiiiettes anten- 

 naires,^^ Lacord.), the latter small and narrow (leaving 

 the globular roots of the antennae exposed) but very 

 prominent ; antemue long, slender ; joint 1 elongate, 

 thickening to the extremity ; 2 short ; o more than twice 

 the length of 2, and, like it, a little swollen at the end ; 

 4-10 elongate, sub-equal, sub-cylindrical, or slightly 

 thickened at their extremity ; 1 1 more than twice the 

 length of 10, cylindrical, the apex pointed ; joints 1-3 

 are smooth and nearly hairless, the remainder are 

 minutely rugose-punctate, and more or less clothed with 

 short decumbent hairs : prothorax globoso-oval, its pro- 

 notum confounded with its Hanks, but with all the angles 

 apparent, distant from the elytra, notably prolonged be- 

 hind the insertion of the anterior coxae ; faintly bisinuate 

 and finely margined in front ; constricted behind near 

 the base, which becomes suddenly and obliquely widened, 

 hind margin somewhat thickened or raised, and strongly 

 bisinuate ; scutelluiit elongate, narrow, sinuous at the 

 sides ; entire, and gradually arched, behind ; elytra 

 elongate, narrow, sub-cylindrical ; half as wide again as 

 the prothorax at the base, which is truncate ; sub-parallel, 

 the shoulders distinct, rounded ; contracted near the 

 hind extremity, with the apex rounded, or obliquely 

 truncate, and with a small spine or tooth at the sutural 

 angle; epipleural fold narrow, sinuous, a little expanded 



* What appears to be the lohe proper (densely clothed with short hairs 

 at its summit) is fouud soldered to the iiuder surface of this plate, and is 

 more or less enfolded by an inner expansion of it ,• no mere description, 

 however, can convey a correct idea of the curious oral organs of this in- 

 sect ; the details given on the plate, where they are shown m situ, and 

 dissected out, on both their faces, will best illustrate them. 



