ARTHROPOD FAUNA 01" THE WEST INDIES. 517 



each consisting of two processes which are very unequal in size — 

 the larger expanded distally, hollowed and curved outwards at 

 the apex ; the shorter, also curved, is directed upwards and for- 

 wards on the inner surface of the larger. 



Length of $ 24 mm., width S'S ; S 23, width 3. 



Locality. Jamaica {T. D. A. Cocherell and T. Toivnsend). 



Evidently allied to the preceding, but differing in very many 

 points. Thus the upper surface is thickly granular, the sculp- 

 turing less clearly defined, the tooth at the base of the posterior 

 border of the keel larger, &c. 



Odontopeltis roRMOSus, sp. n. (PI. XXXIX. fig. 7.) 

 Closely allied to O. viora7itus, Karsch. 



5 . Colour : upper surface with a wide flavous median dorsal 

 band, brown laterally, with the external portion of the keels also 

 flavous ; head and anal somite entirely brown ; antennae and legs 

 flavous, the latter proximally slightly darker. Body robust and 

 nearly flat, the keels being horizontal and rising near the summit 

 of th.e sides. The first tergite with evenly convex anterior border, 

 acutely-angled keels, and mesially emarginate posterior border. 

 The rest of the segments smooth and polished, but sculptured 

 almost as in Folydesmus (s. s.), being divided by a median longi- 

 tudinal sulcus and by a transverse sulcus ; the area behind the 

 transverse sulcus divided into two transverse series of polygonal 

 areas : from each of the two external areas of the posterior series 

 springs a backwardly directed spiniform tooth ; of these teeth 

 the external is larger than the internal, and is situated at the 

 point of origin of the keel, the internal of them is smaller and is 

 not present on the 1st, 18th, and 19th segments. The anterior 

 area of each segment furnished with two setiferous tubercles. 

 Keels moderately large, the anterior border convex, posterior 

 border deeply concave ; external border dentate, and furnished 

 with two spines in its anterior half, the posterior of these being 

 formed by a deep notch, which marks ofi" the thickened porous 

 area ; anterior angle of the keel rounded, the posterior acutely 

 produced. Pores large, looking upwards and backwards. 



Total length. 17"5 mm. 



Locality. Mandeville, Jamaica {T. D. A. CocJcerell). 



This species may be at once recognized from O. morantus by the 

 denticulation of the lateral margin of the keels, its more pro- 

 nounced sculpturing, and difi'erent arrangement of the colours. 



