chamberlin: west Indian chilopoda and diplopoda. 201 



130a. Rhinocricus tobagoensis, sp. nov. 



Type.— M. C. Z. 4,402. Paratypes.~M. C. Z. 4,403. Tobago: 

 near Milford Bay, March, April, 1916. H. L. Clark. 



This species is near R. consociatus from Union Island, and R. juxtus 

 from Grenada. It is a much smaller species than the latter, has fewer 

 segments, and differs in color-pattern as well as in various structural 

 details. It agrees with R. consociatus in size. It differs clearly in 

 the form of the male gonopods, the median plate, for example, being, 

 differently formed, its sides convex proximally and incurved distally 

 instead of straight throughout. The inner (posterior) piece projects^ 

 distally beyond the others; it presents two slender distal prongs of 

 which one is expanded and narrowly laminate distally. 



In color it differs decidedly from both the species mentioned. The 

 general ground color is brown; each segment dorsally is narrowly 

 bordered with black, the stripe narrowing laterad on each side and 

 disappearing in a point near the level of the pore. Below the level 

 of the pore in front of the suture and extending a varying distance 

 dorsad, the somites are dusky to nearly black, embracing lighter 

 areolations below. The anal scutum dark with caudal tip ferruginous 

 and a narrow light border below on each side. Anal valves dark. 

 Legs ferruginous. 



Sulcus of head sharply defined, scarcely interrupted. Antennae 

 very short; sensory cones numerous. 



Second tergite extending much below the coUum, not flattened or 

 excavated. On somites, excepting first and last, two sutures present, 

 these sharply defined entirely across dorsum. The posterior suture 

 sharply bent about the pore. The anterior one taking its origin near 

 the level of the pore excepting in the most anterior segments on which 

 it extends below that level. 



The anal scutum free for a short distance at caudal end but not 

 surpassing the valves, either equalling them or falling a little short. 



Number of segments forty-six. 



Length, up to 35 mm.; width, to 3 mm. 



131. Rhinocricus anguinus Pocock. 

 Journ. Linn. soc. London, 1894, 24, p. 502. ' 

 Habitat. — St. Lucia (G. A. Ramage).^ 



