88 PROCEEDINGS OF THE NATIONAL MUSEUM Von. 113 
in each inner row and two in each outer one with another large tuber- 
cle well below and anterior of them; in addition small seta-bearing 
tubercles are scattered elsewhere over the surface, those on lateral 
carinae smaller. From segment 5 or 6 to near posterior end of body 
the anterior margin of each carina is bowed forward; outer limits of 
carinae of segments 3 to 6 or 7 rather sharply rounded, ensuing ones 
gradually longer, the first of which have two lobes faintly indicated, 
the posterior ones with three lobes indicated; posterior margin of 
carinae with a deep notch at middle. Pores apparently in normal 
sequence but difficult to see, opening from a tubercle similar in shape 
and color to adjacent ones but slightly larger and located behind 
central point of carina. 
Last segment short, between three and four times as broad as long, 
surface with scattered tubercles of which a median pair are larger; 
posterior margin with three distinct lobes each side of the apical one, 
the lobes separated by deep, narrow notches, outer lobe on each side 
largest. 
Gonopod as shown in figure 26. 
Genus Lignydesmus Cock 
Lignydesmus Cook, Brandtia, fase. 5, p. 28, 1896. 
Lignydesmus panamanus, new species 
FIGuRE 2c-—d 
Houotyre: Female, USNM myriapod collection 2637, Almirante, 
Panama, November 29, 1937, H. F. Loomis. 
PARATYPE: 19-segmented female, author’s collection, same col- 
lection data as holotype. 
Diacnosis: Differing principally from ZL. rubriceps (Peters), as 
shown in Cook’s paper (Proc. U.S. Nat. Mus., vol. 21, pp. 451-468, 
pl. 30, figs. 2a-f, 1898) in having segment 1 crossed by a transverse 
biarcuate sulcus, sides of segment 2 extending only slightly below 
those of segment 3, areate portion of segments less convex than 
the smooth anterior portion. 
Description: Length 9 mm., width 4mm. Surface of segments 
in front of areations finely granular and dull, the areate border less 
granular, somewhat shining and less convex. Color in life probably 
white. 
Head with clypeus almost parallel sided, the lateral margin behind 
it directed sharply outward and backward; surface of clypeus and 
front to between the antennae evenly convex with numerous erect 
seta; vertex with a low but distinct median ridge across anterior 
half, followed by a broad and deep depression across the basal half. 
