A ^lonograjjh of Scytonotus. 239 



Vertex very minutely punctate, appearing smooth, rather densely hir- 

 sute with short hairs ; median furrow distinct, though not deep, extend- 

 ing slightly more than half to the antennal sockets ; on each side a very 

 faint, somewhat arcuate, oblique line extends from the end of the median 

 furrow to the antennal sockets, indicating sutures which join that of the 

 median furrow ; the angles included between these three lines are sub- 

 equal, the lower slightly smaller than the others. These diagonal sutures 

 should jjrobably be looked upon as the lines of demarcation between the 

 vertex and clypeus, as there is no trace of a suture lower down. Above 

 the antennal sockets the vertex is prominent, while laterad from them is 

 a sudden depression or broad groove. The disc like structure to be found 

 just above or outside of the antennal socket in most Polydesmid^e is here 

 not apparent. Under good magnification the vertex furrow is seen to be 

 occupied by minute transverse wrinkles. 



Clypeus somewhat less hirsute than the vertex, prominent between the 

 antennae, and especially on the sides below the antennal groove mentioned 

 above ; lower down the clypeus is flattened or with a broad shallow dej^res- 

 sion, and with fine transverse wrinkles. Along the lateral margins, below 

 the prominence is a sub-i^lane with a sharp edge, and just above the 

 labrum a transverse elevated one. A deep, curved incision extends fi'om 

 the lateral margin nearly to the antennal socket, just above the lateral 

 prominence. 



Labrum with two rows of bristles, 6-8 in the lower row, 4 in the upper ; 

 broadly and deeply emarginate, the emargination with three rounded 

 teeth, which do not project as far as the edges of the emargination. 



Antennae rather densely pilose, 3.25-2.75 mm. long, third joint slightly 

 longer than the first two taken together ; sixth joint much the thickest, 

 all but the first and last obconic. 



Mandibulary stipes large, projecting laterally beyond the first segment, 

 above and posteriorly angled (see fig. 47); exposed surface divided by 

 sutures into 6 areas, of which 5 are triangular and 1 trapezoidal (figs. 48- 

 49;; masticatory plate elongated triangular, with numerous transverse 

 ridges closer together towards the small end (fig. 55). One side fringed 

 with denticulated processes (fig. 56). Under a high power the ridges are 

 seen to be pinnately branched, and toward the small end of the plate the 

 ridges become indistinguishable and pass gradually into a fine raised re- 

 ticulation (fig. 57). Between the ridges, toward the large end the plate is 

 perforated by numerous round openings — possibly of the salivary ducts. 



Dentate lamella with four rounded teeth, the margin beyond the teeth 

 with one or two indistinct notches (fig. 53). 



jNlentum pointed-cordate, slightly longer than broad, the surface tuber- 

 culate-papillose, a few short bristles near the ape?v (fig. 50). 



tStipes three times as long as their greatest width ; a transverse row of 

 long bristles anteriorly, a median area rather sparsely covered with some- 

 what shorter bristles extending nearly to the proximal end of the stipes. 



Cardo irregularly trapezoidal, over twice as long as broad. External 

 process with 6-8 cones, the internal with 10-14 (fig. 51). 



