WEST INDIAN CENTIPEDES — CRABILL 175 



10a. Ventral pore fields of anterior sternites each clearly transversely elliptical. 



(Seychelles, Madagascar, Japan, Pacific area, and Brazil.) 



Thalthybiiis Attems 

 106. Ventral pore fields of anterior sternites strictly circular. (South and 



Central America, Mexico, and North America.) .... Ityphilus Cook 



Caritohallex tninyrrhopus, new species 



Figures 1-6 



Holotype, male, USNM 2520, British West Indies, Tortola, Sea 

 Cow Bay, from Berlese sifting of beach debris, March 26, 1958, 

 J. F. G. Clarke. 



Total length 10 mm. Pedal segments 39. Color pale whitish 

 yellow throughout; without the green or purplish subsurface pig- 

 mentation so characteristic of many ballophilines. 



Antennae (see also note E, p. 192): Length, 0.82 mm. Proximal 

 articles filiform, becoming distally moniliform. Proximal six or seven 

 articles sparsely setose, thereafter becoming more setose. Ultimate 

 article with a compact group of 8t-10 hyaline spatulate setae on outer 

 surface arising from a shallow depression; special sensory structures 

 (sensilla) not detected on other articles. 



Cephalic plate: Length along midline 0.32 mm., greatest width 

 0.32 mm. Subrotund, including prebasal plate somewhat longer than 

 wide; posterior margin embayed to disclose prebasal plate; dorsal 

 surface domed. Setae very sparse and short. Areolation relatively 

 large and pronounced; without sutures or sulci. 



Clypeus (see also note A, p. 189) : Wider than long, bulging ventrally. 

 Paraclypeal sutures bowed outward, each relatively wide; each side 

 with a notch at position of transbuccal suture, the latter if present 

 very obscure. Clypeal areas absent. Posteriorly with an arching 

 band of more heavily sclerotized, more deeply colored areolation, 

 which encloses a membranous nonareolate crescentic area continuous 

 (or identical) with the atrophied labrum. 



Labrum : Apparently continuous with crescentic membranous area 

 of clypeus. Medial part without trace of teeth, entirely membranous. 

 Each lateral part of the labral arch with about two weakly pigmented 

 teeth, medial to the teeth about two flabby, membranous tooth-shaped 

 lobes, barely distinguishable and almost totally transparent. 



Mandible: Dentate lamella evidently very indistinctly divided into 

 three parts, with seven or eight teeth; dentate lamella lying under 

 (in situ posterior to) the row of simple hyaline teeth. Condyle 

 promient, peglike. 



First maxillae : Telopodite distinctly bipartite, with one seta; lappets 

 approximately attaining end of telopodite, hyaline, virtually trans- 

 parent, not squamulate. Coxosternum not suturate medially, anterior 



512055 60 -2 



