238 DE. C. CHILTON ON THE SUBTERRANEAN 



and usually presents tlie appearance shown in fig. 8. The inner edge is very different 

 from that of the left ; it has a stout rounded base, and bifurcates towards the end ; each 

 division tapers to a point, bears one or two teeth, and is more or less tubercled, as shown 

 in the figure. 



Lower Up. Fig. 9 represents a portion of the lower lip of the large male from which this 

 description is taken, the appendage having been torn in dissecting it out ; the whole of the 

 lip is better shown in PL XXIII. fig. 10, which is taken from a female specimen. The two 

 outer lobes are comparatively long and narrow towards the extremity ; their outer 

 margins are fringed with very delicate setae, and the inner margins bear numerous short 

 setae curving inward. The division between the two lobes does not appear to reach 

 quite to the base of the lip. The inner lobes were not observed in the female ; a part 

 which probably belongs to them is shown in the drawing taken from the male (PL XXII. 

 fig. 9). The lateral backward processes are moderately long and narrow. 



The^y^r*^ maxilla (PL XXII. fig. 10, 11, 12, 13) in the male specimen dissected had the 

 inner plate very small and delicate, oval, and with five plumose setae on the inner margin. 

 The middle lobe is broad, rectangular, squarely truncate at the end, and bears about twelve 

 strongly denticulated spines, as shown in fig. 11 ; the form and position of these spines 

 will be more easily understood from the figure than from a verbal description. The palp 

 has the first joint short, not much longer than broad, the end somewhat oblique ; the 

 second joint is long and curved, rather broad, and terminates in the right (?) maxilla 

 (fig. 12) in about seven stout, short setae or spines. The two outermost are the longest 

 and narrowest and are bristled ; the others, which are short and stout, form very sharp 

 teeth ; near the base of the second tooth from the outside arises a single shnple seta. 

 In the other maxilla (fig. 13) the end of the jjalp is very different; it bears five setae, 

 very much longer and narrower than those on the right (?) ; the single simj)le seta arises 

 from the base of the second outermost one as on the right (?). 



The second maxilla is shown in fig. 14, and does not appear to present any remark- 

 able feature. On the surface of the inner lobe is an oblique row containing seven 

 plumose setae. The surface of this lobe towards the base is covered with very fine 

 delicate setae, and similar setae are found on the outer margins of both lobes towards 

 their extremities. The end of the outer lobe bears about seven or eight long setae, 

 curved slightly inward ; the end of the inner lobe bears similar setae, which are, how- 

 ever, much shorter, and some of them plumose. The setae extend some distance along 

 the inner margin, but gradually become smaller as they recede from the extremity. 



The maxilUpedes, as seen from below, are shown in fig. 15. The bases hears at its 

 extremity, towards the inner side, a group of nine or ten long setae ; the plate attached to 

 it — the inner plate — extends only as far as the end of the inner margin of the meros; it 

 bears at the end two stout sharp teeth and a third more slender, and numerous stiffly 

 plumose bristles ; its inner margin bears five or six plumose hairs. The ischium bears at 

 the extremity a group of setae as in the basos ; the plate attached to it — the outer plate — 

 reaches as far as the extremity of the outer edge of the meros ; its inner edge is straight 

 and bears about ten moderately stout spines, which gradually merge at the end into long, 

 stiffly plumose, curved setae ; in addition to these spines the inner margin bears 



