350 INSECTA. 



with two reddish lines along the back; fifty-four segments, the 

 penultimate terminated by a stout point with a horny and hairy 

 extremity. Inhabits Europe, 



/. terrestris, L. ; Geoff., Insect. II, xxii, 5. A fourth smaller; 

 bluish-cinereous, picked in with light yellowish; forty-two to 

 forty seven segments. Inhabits Europe with the sabulosus *. 



POLYDESMUS, Ldt. 



The Polydesmi resemble the luli in the linear form of their body, 

 and the spiral manner in which they roll up their body; but the seg 

 ments are compressed on the inferior sides, and have a projecting 

 ridge above, They are found on stones, and most commonly in wet 

 places f . 



The species with apparent eyes form the genus Craspedosoma of 

 Leach J. 



The others have a very soft, membranous body, terminated by 

 pencils of little scales. Their antennae are equal. Such is the 



POLLYXENUS, Ldt., 



Which as yet comprises but a single species, placed among the 

 Scolopendrae Sc. lagura,lj., by Linnaeus, Geoffroy and Fabricius. 



It is the lule a queue en pinceau of De Geer, Insect., VII, 

 xxxvi, 1, 2, 3,; Zool. Miscel., cxxxv, B. Very small, oblong, 

 with bunches of little scales on the sides, and a white pencil at 

 the posterior extremity of the body. It has twelve pairs of feet 

 placed on as many semi-annuli. Inhabits cracks in walls, and 

 under pieces of bark . 



FAMILY II, 



CHILOPODA ||. 



The antennae of the Chilopoda are more slender towards the extre- 

 mity, and consist of fourteen joints and upwards ; their mouth is 



* See the two memoirs of Savi already quoted, and Leach, Zool. Miscell., Ill, 

 for an account of these two species and some others that inhabit England. Add 

 lulus indus, L.; De Geer, VII, xliii, 7; Seb., Mus. II, xxiv, 4, 5; Seb., Mus. I, 

 Ixxxi, 5; Schfiet., Abhandl, I, iii, 7. [Add of the American species the/, impres- 

 sus, punctatus, annulatus, lactarius, marginatus, and pusillus.'] 



f The luli cumplanatus (Zool. Miscell. CXXXV, A), depressa, stigma, trident atus, 

 Fab. ; his Scolopendrse ? dorsalis and clypeata. [Amer. species, P. serratus granula- 

 tus, Say, and the lulus virginiensis, Drury.] 



J The species, unknown before Leach, appear to be proper to England. See pi. 

 cxxxivof his Zoological Miscellany, vol. III. 



There is a second species, P. fasciculatus, Say, that inhabits the southern 

 section of the United States. See Jour. Ac. Nat. Sc. of Phil. II, part I, p. 108. 



H CHILOPODA, Lat. or the genus Scolopendra, Lin. &c. 



