Carpenter — The Apterygota of the Seychelles. 25 



L. fimhriatipes (fig. 138) it is seen in surface view to consist of four prominences 

 arranged rosette-wise, and surrounded by a cuticular thickening, close to 

 which project a number of stout, thick, elongate spines. Silvestri overlooked 

 the "auditory" bristles on the antennal segments from the third to the sixth, 

 inclusive (figs. 136, 137). They agree closely with the similar structures found in 

 Campodea ; each bristle springs from the centre of a conspicuous cup-shaped 

 depression of the cuticle. There are two of these sensory bristles on the 

 lower, and two on the upper, aspect of each antennal segment bearing them. 



The mandible (fig. 141) resembles generally that of the Argentine 

 Lepidocampa figured by Silvestri {I.e. pi. 6, fig. 4), having an acuminate 

 condyle and four prominent apical teeth, three of which bear minute 

 subsidiary teeth ; on the inner face of the third tooth are a series of ridges, 

 forming apparently a grinding area. The lacinia to which Silvestri drew 

 attention is conspicuous, consisting of a delicate " comb " of eleven teeth 

 springing from a wide base attached to a blunt outgrowth of the inner edge 

 of the mandible just beneath the teeth (fig. 142 /). 



The maxilhdae, maxillae, and tongue agree rather closely with the corre- 

 sponding structures in Silvestri's American Lepidocampa ('99, pi. 6, fig. 6) ; 

 in our species, however, the lacinial " comb " (fig. 143 /) has six processes, 

 each ending in a delicate and slightly inflected lamella. The innermost of 

 these processes has a perfectly smooth inner edge in L. fimbriatipes, whereas 

 in Silvestri's figure it is shown with a marginal row of small, sharp teeth. 

 The palp (fig. 143 ^j) is acuminate, with two or three papillae and stiff 

 spines at its tip ; it projects obliquely and inwardly towards the mouth from 

 the galea (fig. 143 g), which is crowned with a group of long bristles, and 

 bears near its anterior terminal edge a blunt, peg-like sensory structure 

 (fig. 144). The nutxilhda (figs. 143, 157 i/.'/) consists of a sub-triangular lobe 

 with its blunt apex projecting over the tongue {Hy) and beset with very fine 

 ridges and hair-like outgrowths. The outer edge of the maxillula is connected 

 with the palp and galea just described, and the arrangement of these parts in 

 Lepidocampa — lying as they do distinctly anterior to the stipes and lacinia — 

 suggests that they belong really not to the maxilla, but to the maxillula, an 

 opinion advocated— after study of the very similar corresjionding organs in 

 Campodea and lapyx — by von Stummer-Traunfels ('91) and Hansen ('93). 

 But the base of the galea is clearly connected with the maxillary stipes, the 

 lacinia in insect maxillae generally lies behind the galea, and Borner ('08), 

 after careful comparison of these structures in lapyx with those of Machilis 

 on the one hand, and of the CoUembola on the other, is convinced that they 

 are rightly referred to the maxilla. In support of this view, it is noteworthy 

 that in the Machilids — probably as regards their jaws the most primitive of 



B.I.A, PEOC, VOL. XXXIII, SECT. B. [E] 



