90 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Panamadesmus sculptilis, new species 
FIGURE 2e-2 
Houtotyre: Male, USNM myriapod collection 2638, Pifia area, 
Canal Zone, March 18, 1958, H. F. Loomis. 
ALLoTyPE: Female, USNM, same collection data as holotype. 
Paratypes: Male, Snow Museum, 2 males and female, author’s 
collection, same collection data as holotype. 
Description: Length 10 mm., width 4 mm. Color in life uni- 
form cinnamon brown. 
Head with clypeal area smooth and shining, convex, raised slight- 
ly above frontal area which is transversely wrinkled; anterior half 
of vertex with a short weak median ridge, surface behind it smooth 
and convex for a short distance, followed by a median depression, 
deepest in front, not reaching the back of the head; antennae cras- 
sate with joint 5 longest and thickest. 
Segment 1 (fig. 2e) with front margin deeply concave, having a 
raised rim extending around the anterior margin; surface behind 
front margin gradually raised into a high biarcuate crest descending 
gradually at middle but abruptly on either side of it; between crest 
and the faimtly areate posterior border are four large flat sharply 
marked subquadrangular areas. 
Segment 2 (fig. 2/) shaped much as in Mesesmus insulatus, as shown 
by Chamberlin, but with each side extending farther downward,well 
below the side of segment 3; areate border as in above species and 
similar to that of ensuing segments. On these segments the sulcus 
between the areate border and anterior portion definitely more im- 
pressed than in Lignydesmus panamanus but the convexity of the two 
portions similar; surface of anterior portion very finely granular, 
dull, that of the areate border less densely granular and somewhat 
shining. Pores on prominent swellings to segment 13, reduced on 
segment 15 and lacking swellings on segments 16-18. Segments 18 
and 19 as shown in figure 2g, the latter with median sinus very narrow, 
not exposing segment 20 which is thick, convex, and with a tuberculate 
margin as shown in figure 2h. 
Gonopods (fig. 27) composed of two erect branches, an outer spoon- 
like one and a shorter, thicker inner one terminating in an obtuse 
point. 
Joint 3 of third male legs swollen distally. Female with ventral 
anterior margin of segment 3 raised at middle into a low, triangular 
lobe that is not as high as the one in L. panamanus. 
