484 ME. E. I. POCOCK ON THE 



valves, marked wifh a transverse constriction. Valves convex, 

 Avith strongly compressed margins. Sternite posteriorly angular, 

 defined by a sulcus. 



Legs with two, three, or more setae ou the lower surface of 

 each segment. 



(S . Face rather smoother than in the female, with the antennae 

 a little longer ; legs with the penultimate and antepenultimate 

 segments padded ; anterior border of coUum produced. 



Copulatory feet as in fig. 1 d. 



Number of segments : $ , 60-63 ; S , 59-63. 



5 , length up to 150 mm., width 9'5 ; c? , length up to 70. 



Localities. St. Thomas (in Brit. Mus.) ; Grenada (^. H. Smith 

 and SJierring^. 



The following label accompanies some of Mr. Smith's speci- 

 mens : — " Windward side, below 500 ft. ; March-July. Common 

 on logs, &c." 



This species is unquestionably very nearly related to Sp. nitidus 

 of Daday from Trinidad ; but although no differential characters 

 are mentioned in tlie description of this last-named form, it is, I 

 think, wise to look upon the two as provisionally distinct, at least 

 until the male of the Trinidad form comes to light and settles 

 the point. 



>S^. antillanus may be recognized from Sp. ventralis by its 

 smooth sterna ; from 8p. sculpturatus by the absence of sulcate 

 sculpturing on tbe dorsum, by its shorter antennae, different 

 colour, &c. ; and from >S^. ahstemius also by the sculpturing, 

 difference in the number of segments, &c. 



Family SpiEOBOEiDiE. 



[ = Spirobolinae of Bollman, loc. cit. ; Spirobolidse (in part), 

 Verhoeff, Zool. Anz. xvi. p. 481, 1893.] 



The West-Indian species of this family fall into the following 

 four genera : — 



a. Labral pores 3 to 5 on each side ; first tergite 



laterally narrowed ; no scobina Spirobolus, Br. (s. s.). 



Type, Bungii, Brandt. 



b, Labral pores 2+2. 



a^. First tergite laterally acutely angled; no 



scobina Trigoniulus, nov. 



Type, Goesi, For. 



