ARTHROPOD FAUNA OF THE WEST INDIES. 505 



ever, appear to be slightly immature, inasmuch as the three pos- 

 terior segments are apodous. 



The colouring of this species furnislies a very vrell-marked 

 characteristic of it. In having a median dorsal black band it 

 approaches S. grammostictus and R. serpe^itinus ; from both , 

 however, it differs in size and in having the flavous spot on each 

 side of tbe dorsal middle line much larger and the lateral black 

 band very strongly marked. Moreover, a further difference from 

 serpentinus is the smaller number of its segments, and from 

 grammostictus the absence of a tail. 



Ehinocricus Cockebellii, sp. n. 



Colour : posterior portion of each segment widely flavous 

 behind the transverse sulcus, this band is, however, very faintly 

 fuscous in tbe dorsal middle line ; the anterior portion of the 

 segments is black above, ferruginous or lurid as bigh as the pore ; 

 bead with a median T-sbaped fuscous fascia as in i2. sahulosus : 

 anal tergite entirely ferruginous ; valves flavous ; antennae and 

 legs flavous. 



Allied to JR. sahulosus in nearly all respects ; tbe transverse sulcus 

 is incomplete dorsally on all the segments, and the supernumerary 

 sulcus is only complete in tbe anterior half of the body ; the 

 posterior portion elevated. Anal tergite posteriorly very obtusely 

 angled, not surpassing tbe valves ; valves not compressed ; sternite 

 rounded. 



Legs moderately long. 



Number of segments 45. 



Length 34 mm., width 3*5 mm. 



Locality. Mandeville, Jamaica, 1950 ft. alt. {T. D. CocherelT). 



Differs from the preceding principally in colour and number 

 of segments. Perhaps of the extra- Jamaican species it comes 

 nearest to B. anguinus from St. Lucia; but it certainly diff'ers in 

 colouring and in having the anal tergite obtusely and not acutely 

 angled. 



Ehinoceicus Townsendi, sp. n. 



Colour entirely black, except for a fine pale border on the 

 segments. 



Collum without marginal sulcus. Segments without trace of a 

 transverse sulcus above, the entire area being perfectly plane and 

 unornamented from the anterior to the posterior border. The 

 sulcus visible inferiorly and extending as far as about halfway up 



linn, JOURN. — ZOOLOGY, YOL. XXIY. 38 



