ISOl'ODS OF NORTH AMERICA. 625 



The lir.st two abdomiiiiil segments have the lateral parts undeveloped. 

 The third, fourth, and fifth segments are Ijroadly expanded laterall}^ 

 tiie outer margins forming a continuous and unbroken line with the 

 margins of the thoracic segments. The terminal segment of the a})do- 

 men extends but a distance of half its length be3^ond the lateral parts 

 of the preceding segment; its surface is smooth. The basal joint of the 

 uropoda attains half the length of the terminal segment. The inner 

 branch reaches the apex of the last segment. The outer l)ranch extends 

 half its length beyond this. 



Two specimens were collected l)y Prof. A. E. Verrill and part^^atthe 

 Bermudas in 1898. They were found in dead coral at Castle Harbor. 



Type in Peal)ody Museum, Yale University. Cat. No. 3333. 



This species can not be identitied with anv of the descril)ed species 

 of the genus: L. panzerii (Audouin and Savigny), L. tciKricus Budde- 

 Lund, Z. sqnamatm Budde-Lund, and Z." loitiis (Budde-Lund), 

 although it seems more closeh' related to'the last named than to 'M\y 

 of the former. 



111. Genus METOPONORTH US Budde-Lund.^' 



Body oblong, depressed, not convex, scarcely contractile. 



Head marginate and with hiteral lobes very small; frontal lobe want- 

 ing; vertical marginal line extending to the lateral lobes; second pair 

 of antennas long; flagellum composed of two articles, the first article 

 generall}^ longer than the second; abdomen abruptly narrower than 

 the thorax, with the lateral parts of the third, fourth, and lifth seg- 

 ments small, appressed; terminal segment short, triangular, extending 

 moderately lieyond the lateral parts of the preceding segment; oper- 

 cular plates of the iirst two pairs of pleopods furnished with tracheae, 

 rarely those of the third or of all the pairs furnished with trachea?. 

 Inner branch of the uropoda inserted far in front of outer l)ranch, 

 near the inner antero-lateral angle of the peduncle. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS METOPONORTHUS. '' 



a. Jjiiteral parts of the third, fourtli, and fifth segments of the abdomen well 



developed Metoponorthus sauss-urei Dollfus. 



c/. Lateral i)arts of the third, fourth, and fifth segments of the thorax reduced, small. 

 I). Epistome furnished with a sinuated transverse line. 



<: Second pair of antenuie equal to three-fifths the length of the body. First 

 article of the flagellum much longer than the second. Liner face of right 

 mandible furnished with four to five penicils, of the left with six penicils. 

 Terminal segment of abdomen almost flat. Color brown or reddish brown, 

 often mottled with white spots Metoponorthus pridnosus (Brandt) . 



«See Dollfus, Mem. Soc. Zo<")l. de Franc^e, 1896, pp. 542-543. 



b For characters of genus see Budde-f^und, Crustacea Isopoda Terrestria, 1SS5, pp. 

 161-162, and Sars, Crust, of Norway, II, 1899, pp. 183-184. 



'This key has been prepared entirely from the descriptions of the forms, which 

 give few characters for a synoptical arrangement. 

 28589—05 40 



