464 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



and finally extended into a long tooth with an oblique or backward 

 direction. (See^l. 60, fig. In.) Pore formula probably normal, but, 

 with so many of the segments separated, all that can be definitely 

 ascertained is that segment 7 has pores, and also the last nine seg- 

 ments of the body, with the exception of segments 14 and 20. 



Supplementary margin well developed, consisting of a row of 

 oblong or broadly spatulate appendages, those of the ventral side 

 broader and with truncate entire margins, those of the dorsal side 

 distinctly angled in the middle and with the margins very minutely 

 toothed. (See pi. 60, figs. 1/ and lg.) 



Posterior segments gradually narrowed, the last three more 

 abruptly, and with the margins more deeply lobed; the posterior 

 margins more deeply notched or toothed, and the poriferous lobes 

 of the carinas produced into long recurved spines. 



Last segment small, conic, not concealed under the penultimate; 

 the decurved apex ending in a small truncate tubercle, not definitely 

 indicated in the drawing. (PI. 60, fig. In.) Anal valves rather flat, 

 the surface minutely granular but without distinct tubercles. 



Preanal scale very broadly triangular, the lateral edges distinctly 

 concave; apex rounded in the middle, but produced on each side into 

 a distinct papilliform tubercle, bearing a long bristle. (PI. 60, fig. li.) 



Sterna narrow, with a distinct, but rather narrow and shallow 

 median groove, and a broader and deeper transverse groove; no 

 spines at the bases of the legs. (PI. 60, fig. lc.) 



Legs rather slender; joint 2 nearly as long as joint 3, slightly 

 exceeded by joint 6; joint 5 nearly twice as long as joint 4 and half 

 as long as joint 6. (PI. 60, fig. lh.) 



Copulatory legs with a large clypeate basal joint inclosing and con- 

 cealing the complicated terminal joint. (PI. 60, figs. \j, Jc, I, and m.) 

 The basal joint has a strong tooth near the middle of the posterior 

 border. The upper part of the basal joint, as seen on the mesial face 

 (pi. 60, fig. lm) has a large depression to accommodate the strongly 

 recurved terminal spine of the apical joint which bends backward 

 toward the depression. Anterior margin of rim of aperture with a 

 triangular median process. (PL 60, fig. 1/.) 



CHATELAINEA PTERODESMOIDES, new species. 



Type-specimen. — Cat. No. 802, U.S.N.M., collected by Heli Chate- 

 laine at St. Paula de Loanda. Accession 23,400. 



Length of male probably about 18 mm.; width 3.5 mm. 



Color of alcoholic specimen a dull slightly reddish brown, paler 

 below. As in Stylodesmus and other related forms, the finely hispid 

 or pilose surface doubtless holds small particles of earth that lend 

 the living animal the exact color of the soil in which it happens to 

 liv©. 



