AHT. 8, MILLIPEDS OF CEXTRAL AMEPJCA — CHAMBERLIN. 39 



The ^oiiopods cross each other when in place. They resemble 

 those of the preceding .species. The accessory branch is more elon- 

 gate tlian in -:V. trJstanl (Pocock), distally more narrowed, and the 

 gonopod is narrower at level of origin of style, as shown in plate 15, 

 figure 11. 



Length, TO mm. : width, 12.5 mm. 



Locality. — Nicaragua : One male. 



Type.—Q^i. No. 5,020, M.C.Z. 



85. NYSSODESMUS NICARAGUANUS, new species. 

 Plate 16, figures 1-4. 



The type of this siDecies is nearly the same as nigricaudus in colora- 

 tion excepting that the caudal tergite is entirely yellow instead of 

 black. The head much as in nigncaudus,- the ridge mesad of the 

 antennal socket larger. All metazonites have the posterior border 

 crossed hj longitudinal sulci, visible to the naked eye, which set off a 

 transverse series of longitudinallj' oblong areas. The keels of the 

 middle and posterior regions have their anterior margins obviously 

 more oblique and the lateral margins less acutely dentate, the margins 

 being typically simply undulate. The pore body is smaller and is 

 farther removed from the margin, being mostly from tw^o and a 

 quarter to two and a half times its diameter from the nearest point 

 of the margin (pi. 16, fig. 1). The anal valves have the anterior 

 tubercle separated from the marginal rim but the posterior one is 

 merged with tlie rim, so that its seta appears to be borne directly by 

 the latter. The upper seta of lateral part of last tergite carried on a 

 more distinct tubercular elevation. The tubercles of anal scale are 

 more rounded than in nigricaudus (see pi. 16, fig. 2). 



In the type of this species the gonopods do not cross each other, 

 being less twisted than usual, but lie with their convexities in contact. 

 Accessorj^ branch proximallj'^ broad, with sides parallel, but distally 

 acimainate as shown in plate 16, figures 3 and 4. 



Length, male, 83 mm. ; width, 13.5 mm. 



Locality. — Nicaragua : Machucha, a male and female (Dr. J. E. 

 Bransford). 



Type. — In collection of Philadelphia Academy of Science. 



87. NYSSODESMUS TRISTANI (Pocock). 



Platyrarhus tristani Pocock, Biol. Centr.-x\mer., Diplop., 1909. p. 141, pi. 10, 

 figs. 6-6&. 



Locality. — Costa Rica : La Palma. 



88. NYSSODESMUS LIMONENSIS (Attems). 



Plalijrrhacus limoiiensis Attems, Deuks. Acad. Wiss. Wein, vol. 68, p. 344, 

 pi. 14, fig. 319. 

 Locality. — Costa Rica : Port Limon. 



