60 PROCEEDINGS OF THE NATIONAL MUSEUIM vol.86 



LEIODERE, new genus 



Type. — Leiodere torreyana., new species, from southern California. 



Description. — Body slender, 15 to 25 times as long as broad, sub- 

 moniliform; surface smooth, without distinct dorsal ridges. 



Head without eyes; antennae rather short and subclavate; clj'peus 

 with four large setae ; labrum with 14 smaller setae ; gnathochilarium 

 with the sides converging toward the base, the mentum entire; man- 

 dibulary stipes hidden from above, slanting under the head, slightly 

 convex and with a fine raised rim below. 



First segment nearly as long as or longer than the next three 

 segments together; with definite anterior and posterior corners, the 

 latter somewhat clasping the sides of the body; lateral margin 

 straight and with a raised rim. 



Segments 2, 3, and 4 constricted caudad, forming a more or less 

 distinct neck; dorsum flat longitudinally, not at all convex. Suc- 

 ceeding segments with the posterior subsegment convex, abruptly 

 elevated from the constriction above the anterior subsegment, caus- 

 ing the body to appear submoniliform. In two of the species there 

 is a general swelling of the surface on each side of the middle of the 

 dorsum, with a concomitant median depression; the other species, 

 having no dorsal swelling, lacks the median depression. Pores small, 

 beginning on segment 5, the general surface about the pore slightly 

 more convex than elsewhere, sometimes even raised into a noticeable 

 swelling. Lateral striae not reaching to the pore on any segment. 



Last segment as long as or longer than the two preceding segments 

 together; each lateral margin containing a seta and four to eight 

 setae in the apical margin ; apex rounded and not projecting beyond 

 the anal valves. 



Anal valves moderately convex, the margins meeting in a groove. 

 Preanal scale transversely subelliptic. A process on each side of 

 the scale but not prominent. 



First pair of male legs slightly reduced, 6-jointed, the terminal 

 claw normal. 



KEY TO THE SPECIES OF LEIODERE 



1. Body small, less than 15 mm in length; 40 segments or less; an- 



tennae with joint 2 longest nana, new species 



Body 15 mm or more long ; segments more than 40 ; antennae with 

 joint 2 equaled or exceeded by at least one other joint 2 



2. Dorsum of segments with a shallow median depression, bounded 



on either side by a broad, indistinct swelling; first segment 

 longer than next three segments combined; last segment with 



8 apical setae dasyura, new species 



Dorsum of segments lacking broad swellings or a median de- 

 pression ; first segment shorter than next three segments com- 

 bined ; last segment with 4 apical setae torreyana, new species 



