ABTHEOPOD FAUNA OF THE WEST INDIES. 485 



S\ First tergite widely rounded; scobina gene- 

 rally present. 

 or. Anal somite normally constructed .... Rhinocricus, Karscli. 



Type, parens, Karsch. 

 b^. Anal valves closing nearly transversely ; 



the steruite enormously thickened Thyroproctus, nov. 



Type, Townsendi, sp. n. 



G-enus Spieobolus. 



*Spieobolus MtrLTiF[p]oRUS, Karsch, op. cit. p. 58. 



" Colour fusco-bruBneous, the collum, antennae, legs, posterior 

 margin of the segments, and the anal valves pale brovirn. 



" Small and slender. 



"Head smooth ; pores 4+4 or 5 + 5 ; antennae not surpassing 

 the collum. 



" Collum laterally narrowed, widely rounded, almost touching 

 the margins of the second segment, with a marginal sulcus. 

 Segments very smooth ; the sulcus obsolete dorsally ; the anterior 

 portion smooth, the posterior longitudinally sulcate beneath. 

 Pores large, only just in front of the sulcus, above the middle of 

 the side. Anal tergite subacute posteriorly, scarcely surpassing 

 the convex valves. 



" Number of segments 39. 



" Length of body 25 mm. 



''''Locality. Porto Eico." 



Genus TEiaoNiTTLUs. 



TEiGONiiiLtrs GoESi {Porath). 



Spirobolus Goesi, Porath, Bih. Sv.-Vet. Akad. Handl. iv. no. "J, p. .36; 

 id. Ann. Sac. Ent. Belg. xxxii. p. 244. 



S. dominicEe, PococJc, Ann. Mag. Nat. Hist. (6) ii. pp. 481-483, 

 pi. xvi. fig. 7- 



? S. sanctse-luciae, Bollman, Proc. U. S. Nat, Mus. 1888, p. 214. 



The British Museum has examples of this widespread tropical 

 species from Hayti and Dominica. Porath has recorded it from 

 St. Bartholomew, and the type of Bollman's species was from 

 St. Lucia. This species, which has been intelligibly described in 

 the papers mentioned in the above list, maybe always recognized 

 by its uniform earthy or brick-red colour, its laterally-narrowed 

 collum, and its characteristic sculpturing, which takes the form 

 of a network of crescentic or subcircular striae. 



