chamberlin: west Indian chilopoda and diplopoda. 223 



series present in Treseolobus, and so forth; the tubercles on each 

 ordinary tergite form three transverse rows. The last tergite is large, 

 freely exposed, tuberculate above and with the free margin crenulate 

 or lobed. The keels are high on the sides, depressed. The genus is 

 readily differentiated from the related ones in bearing the porigerous 

 cones or processes on somites V, VII-X^ III (XIX). 

 Genotype. — H. parvus, sp. nov. 



173. HoMODESMUs PARVUS, sp. nov. 



Type.— M. C. Z. 4,480. Haiti: Manneville, December, 1912. 

 W. M. Mann. 



The general color is yellowish brown, uniform. The dorsum is 

 strongly arched, high. The keels much depressed. Head above 

 labrum strongly roughened with ridges and tubercles. First tergite 

 high, the free border but little depressed below the general level, 

 covered with about five transverse rows of tubercles uniform in size 

 and even in arrangement. The second tergite anteriorh' a little 

 wider than the second but narrowing caudad, with the anterior lateral 

 border clearly more elevated than the posterior lateral. The second 

 somite, especially the keels, much longer than those immediately 

 following. The keels of the fourth and following segments have each 

 a single distinctly projecting lobe or tubercle on its caudal margin; 

 the lateral margin is trilobate in all. The porigerous process extends 

 obliquely caudolaterad between the most caudal lateral lobe and the 

 caudal one. The anal tergite with eight or ten marginal crenations; 

 the anterior row of tubercles elongate, much exceeding the more 

 caudal ones in size. 



In the male gonopods the basal lobe is subconical with the side 

 against the segment and the tip cephalad, curving mesad, and touch- 

 ing the edge of the sixth segment. The principal distal process arises 

 on its mesoventral side, runs forward against it to its anterior end and 

 then evenly curves freely ventrad; from near the base of each blade, 

 which is wide and somewhat concave, arises a short, transparent, 

 Aentrally directed lobe which is distally subtruncate. 



Length, up to 6 mm.; \\-idth, .7+ mm. 



