196 bulletin: museum of comparative zoology. 



116. Rhinocricus soctus, sp. nov. 



Tijve.— M. C. Z. 4,377. Paratypes.— M. C. Z. 4,378. Grenada: 

 Grand Etang. Roland Thaxter. 



Allied in general structure to R. solitarius of Jamaica but readily 

 distinguished by differences in the male gonopods. The median plate 

 is distally very acute, not widely rounded as in R. solitarius, and the 

 sides are not sinuate as in that species. The intermediate (posterior 

 gonopods) processes in the type protrude beyond the other pieces; 

 each at the tip is bifurcate with one branch expanded at distal end 

 into a transparent piece with double curved or sinuate distal margin 

 and the other slender, distally sinuate or somewhat apically coiled 

 and acute, lying against the tip of the other which it equals in length. 



Color above shining black. Each segment on the sides with caudal 

 border brow^n, the brown stripe widening ventrad and above the feet 

 often embracing all or nearly all of the segment. Legs flavous to 

 light ferruginous. Anal scutum not pale caudally. 



Sulcus on head continuous across venter and down the median line 

 of face but weaker and sometimes in part nearly obliterated at level 

 of antennal sockets. Collum widely rounded on each side; narrowly 

 marginate laterally and around the anterior corner; not striate. 

 Second tergite extending well below the first about the lower end of 

 which it curves to near its middle, not at all flattened below. Seg- 

 ments with no trace of a second suture, and the ordinary one usually 

 weak or obsolete dorsally. Surface of segments in general smooth 

 and shining. Anal scutum caudally rounded, smooth and shining, 

 exceeded by the anal valves. Scobina present, extending much 

 behind middle of body, to about the forty-third segment. 



Number of segments, forty-seven. 



Length to near 54 mm. ; diameter to 4.8 mm. (Female). 



117. Rhinocricus gracilipes Karsch. 

 Zeits. naturwiss., 1881, ser. 3, 6, p. 71. ^ 

 Habitat. — Cuba.^ 



118. Rhinocricus grenadensis Pocock. 

 Journ. Linn. soc. London, 1894, 24, p. 498, pi. 38, f. 11. i 

 Habitat.— GnENADA (H. H. Smith) .^ 



