WEST INDIAN CENTIPEDES — CRABILL 189 



thick aciciilar bristle, the bristle not setiform; each article of leg 

 clothed with a small number of long pale setae. 



Postpedal segments: Gonopods flat, broad, membranous, fused and 

 indented medially, without sutures, apparently unipartite. Terminal 

 pores present, distinct. 



Notes 



NcTE A, Faraclypeal vSutures and Buccae: Heretofore ignored 

 in systematic discussions are what I term here the "paraclypeal 

 sutures." When present and fully developed, they delineate the 

 clypeus laterally; arising in the antennal sockets, they pass laterally 

 and then posteriorly to end usually just ectal to the outer end of each 

 labral sidepiece. They have been observed in various states of 

 development and configuration in numerous geophilomorph genera; 

 in some thej^ appear to be absent, probably following degeneration. 

 For example, in Ityphilus idanus they are extremely vague, whereas 

 in Schendylurus virgingordae they are prominent. In general their 

 presence or absence, their degree of development, and their shape 

 and route promise to be useful as diagnostic characters. 



The paraclypeal sutures, when present, separate the clypeus on each 

 side from the deflected, ventral extensions of the dorsal cephalic 

 plate. In other words, these ventrally deflected surfaces represent 

 the continuations of each side of the cephalic capsule. They have 

 been termed by many authors the cephalic pleura; however, their 

 morphological identity is by no means so clear. Consequently it 

 seems both premature and misleading to homologize each with a 

 segmental pleuron. Therefore, I propose that the term "bucca" 

 (cheek, pi. "buccae") be applied to them instead. Bucca is descriptive 

 without having basic morphological implications. Each bucca, then, 

 is that ventrally deflected part of the cephalic capsule that attaches 

 posteriorly to the maxillae and that is anteriorly continuous with the 

 clypeus from which it is often demarcated by a paraclypeal suture. 



The bucca is sometimes traversed just posterior to the rear limit 

 of the clypeus by an oblique suture, here designated the transbuccal 

 suture. When present, this suture usually begins in the vicinity of 

 the rear terminus of the associated paraclypeal suture, and then 

 passes laterally or anterolaterally to terminate on the lateral edge of 

 the bucca. In some genera the transbuccal suture seems to be con- 

 tinuous with the dorsally lying frontal suture. A transbuccal suture 

 has been found to be present in many Geophilomorpha and absent 

 in many others. Its origin and termination, degree of development, 

 and configuration seem useful as classificatorj^ devices, especially at 

 supraspecific levels. 



Note B, Postmaxillary Sclerites; In many schendylid and 

 geophilid (sensu lato) centipedes, authors have recognized and made 



