6 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. tjl. 



Genus RHINOCRICUS Karsch. 



The following key, based upon the one by Pocock/ will aid in sep- 

 arating the West Indian species of Rhinocrlcus on the more super- 

 ficial characters. 



KEY TO WEST INDIAN SPECIES OF UHINOCRICUS. 



«.' Clypeus very deeply excised R. excisus Karsch. 



(l' Clypeus lij,'litly and normally excised. 

 ?a' Somites with no second tninsverse groove in front of the ordinary sulcus 

 (not always strictly true of arhorcus). 

 c' At least some of the anterior somites with posterior border bisinuate 

 above the scobina. 

 d.' A distinct longitudinal pale stripe along each side of the dorsum ; 

 somites forty-two ; length under 40 mm. 



R. newtonianus ChamDerlin. 

 (7." No longitudinal pale stripes ; the color fuscotestaceous or black ; 

 somites forty-six or more, 

 e.' Pores scarcely above the middle of the side; scobina reaclihig only 



to the twelfth somite R. parous Karsch. 



e.' Pores well above the middle of the side ; scobina reaching to or 

 beyond the twenty-fourth somite, 

 f.* Body distinctly annulate with lighter or darker color. 

 g.^ Transverse suture distinct across dorsum throughout. 



R. electus Chamberliu. 

 g.' Suture obscure or absent dorsally in middle and posterior re- 

 gions R. mediator ChaniDerlin. 



/.* Color uniform Mack. 



g.^ CoUum marginate below; scobina reaching twenty-ninth or thir- 

 tieth somite; legs and antennne light brown or ferruginous. 

 R. guadeloupensis Chamberliu. 

 g.' Collum not marginate below: scobina reaching twenty-fourth 

 somite; legs and antennae shining black. 



R. holomelanus Pocock. 

 c' None of the tergites with posterior border bisinuate. ^ 



r?.' Anal tergite not surpassing the vales, 

 c' Number of somites only forty to forty-four. 



f.' Sulcus deep and sharply defined entirely across dorsum ; width 



typically 5 mm. or over R. liparus Chamberliu. 



A' Sulcus weak or obsolete dorsally, disappearing in an obscure 

 furrow ; width under 3.5 mm. 

 g.^ Anal valves red; median plate of male gonopods distally 

 rounded with lateral margins below bisinuate. 



R. solitarius Pocock. 

 g.^ Anal valves solid black; median plate of gonopods not of this 

 form. 

 7i.' Collum black with narrow ferruginous borders; number of 

 somites forty; median plate of gonopods, acute distally with 

 evenly concave and diverging sides__R. parvior Chamberlin. 

 ft,.' Collum light with black borders; number of somites forty- 

 three or forty-four ; median plate of gonopods distad of base 

 in the form of a long, slender, parallel-sided tongue. 



R. furcianus Chamberlin. 



'Jouin. Linn. Soc, 1S94, vol. 24, p. 486. 



