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82 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 | 
similar ones; surface of swellings and intervening spaces covered 
with small, distinct, rounded granules also present on other segments. — 
Ensuing segments with four longitudinal rows of swellings, three | 
in each row, the two median rows most conspicuous with the two 
anterior swellings in each transversely oval-rectangular, the posterior 
swelling round; in each outer row the front swelling is oval and 
farthest laterad, the other two nearly round. Lateral carinae very 
thin, semitransparent, with front and back margins rimmed; outer 
margins on segments 2-4, 6, 8, 11, and 14 three lobed, other carinae 
four lobed, all lobes with a projecting seta; pores, if present, incon- 
spicuous. Segment 18 with lateral carinae reduced in size, outer 
margin rounded, the four lobes distinct, posterior angles somewhat 
produced backward. Last segment small, irregularly roughened, 
crossed by a row of four setae with four others in the slightly deflexed 
apex. Preanal scale as long as broad, subtriangular, apex broadly 
rounded. 
Gonopods as shown in figure 12. 
Females essentially like males. 
Family Chelodesmidae 
Genus Alocodesmus Silvestri 
Alocodesmus Silvestri, Boll. Mus. Zool. Torino, vol. 11, No. 254, p. 5, 1896. 
Alocodesmus dromeus Chamberlin 
Alocodesmus dromeus Chamberlin, Proc. U.S. Nat. Mus., vol. 60, Cert. 8, p. 48, 
pl. 18, figs. 4-7, 1922. 
Canal Zone, a number of broken specimens, including 2 males, 
Monte Lirio, June 8, 1923, O. F. Cook. 
Genus Chondrodesmus Silvestri 
Chondrodesmus Silvestri, Boll. Mus. Zool. Torino, vol. 12, No. 305, p. 12, 1987. 
Chondrodesmus atrophus Chamberlin 
Chondrodesmus atrophus Chamberlin, Proc. Biol. Soc. Washington, vol. 38, p. 
42, 1925. 
Canal Zone, female, Monte Lirio, June 8, 1923, O. F. Cook. 
Panama, female, Juan Dias, June 3, 1923, O. F. Cook and H. F. 
Loomis. 
