chamberlin: west Indian chilopoda and diplopoda. 227 



about antennal sockets. Head and dorsum elsewhere shining black. 

 Venter and lower part of sides yellow. Upper part of pleurae blackish. 

 Legs yellow, weakly tinged with pink, the antennae more strongly so. 



The species is easily separated from A. cubanus in presenting at the 

 middle of the caudal edge a large angular tooth much more conspicu- 

 ous than in that species and more acute and less nodule-like. The 

 dorsal surface of the metazonites shows no distinct polygonal areas. 

 In the anterior region the metazonites are smooth excepting at the 

 sides; but caudad the entire surface becomes densely finely granular 

 or has a finely appearance under magnification. The caudal pro- 

 duced angles of the nineteenth tergite are much more acute than in 

 A. cubanus. 



Length of female type, 38 mm. ; width, 5.5 mm. 



178. Amphelictogon zygethus, sp. no v. 



Type.— M. C. Z. 4,494. Paratype.— M. C. Z. 4,495. Cuba: 

 Guantanamo, San Carlos, March 20, 1914. C. T. Ramsden. 



The first tergite is black excepting for a narrow border of yellow all 

 around. A few following somites are similarly black excepting the 

 keels and a narrow stripe along caudal margin which are yellow. In 

 the other regions the prozonites above are black excepting a yellow 

 spot at the middle; the metazonites have a dark, reddish brown to 

 black, area at the middle while laterally they are unevenly diluter 

 brown over a yellow ground, the dark color denser in a spot at the 

 base of each keel ; keels and caudal margin clear yellow. Head black 

 excepting for the labrura and lower sides of head as usual. Venter 

 and lower part of sides yellowish. Legs proximally yellow, distally, 

 excepting extreme tips, strongly reddish, the red much denser than in 

 A. cubanus and A. dentatus and approaching the condition in A. 

 rubripes. 



The dorsal surface of the tergites in general smooth and shining, 

 not obviously tubercular and with no definite polygonal areas. Caudal 

 corners of keels in anterior and middle regions but little produced, 

 apically rounded, broad; in the last few plates more strongly pro- 

 duced caudad, broad, distally narrowly rounded. The processes of 

 the nineteenth keels less prolonged and acute than in A. dentatus. 

 On the caudal margin of each keel one, and in the middle and anterior 

 region, two teeth or angular projections, the outer one of these con- 

 spicuous as in ^. dentatus. 



Length, (female type), about 33 mm. ; width, 5 mm. 



