chamberlin: west Indian chilopoda and diplopoda. 243 



207. Ellipodesmus simplex, sp. nov. 



Type.— M. C. Z. 4,526 9. Haiti: Jacmel, December, 1912. 

 W. M. Mann. 



Metazonites chocolate-brown, paler on keels and lateral region of 

 caudal borders or entirely across the latter, but with a black transverse 

 band between keels across anterior third to half. Also blackish along 

 caudal border in some of posterior segments. Prozonites lighter 

 chocolate-brown with a yellow median dorsal line which expands at 

 the ends in hour-glass manner. This mid-dorsal yellow mark much 

 broader in anterior prozonites. Prozonites also dark colored between 

 level of keels and legs but the color obviously more reddish than above. 

 Head pale across base of vertex and below level of antennae, the 

 remaining area above antennae chocolate-colored, the dark area 

 extending as angular tongue at middle to below level of antennae. 

 Antennae and legs yellowish. 



First tergite narrowing subacutely to each lateral end; caudal 

 margin moderately incurved at the middle. 



The keels in general are widely extended from pleurae; anterior 

 and lateral margin forming an even, wide curve back to the caudal 

 corner, or this slightly laterally emarginate on porigerous somites; 

 margin without serrations excepting a small one on second, third, 

 or fourth keels. Keels with caudal corners slightly bent caudad, the 

 production increasing going caudad. 



Cauda widely surpassing the anal valves. 



Length, about 22 mm.; width, 3.6 mm. 



ToMODESMUS, gen. nov. 



This genus is characterized primarily by having the first dorsal 

 plate with its anterolateral region deeply excised, the excision sub- 

 rectangular. 



Antennae long and slender. 



Dorsum high, strongly arched, and wholly smooth. Keels arising 

 low down; very weakly developed except in most anterior segments, 

 but the pores borne on prominent, subcylindrical processes. 



Anal scutum produced into a narrow cauda which exceeds the valves. 

 Anal valves mesally strongly margined. 



