254 INSECT A. 



Hist, des Insect., II, xxii, 3; Patiz., Faun. Insect. Germ., L., 

 xiii; Leach, Zool. Miscel., cxxxvii(l). 

 The others have at least twenty-one pairs of feet, and the segments 

 both above and underneath are equal in size and number. 



SCOLOPENDRA, Lin. 



Those which form the two feet that immediately follow the two 

 hooks forming the exterior lip, present but twenty-one pairs, and 

 whose antennae have seventeen joints, constituting the genera Scolo- 

 pendra and Cry tops of Leach. There are eight distinct eyes, four 

 on each side in the first, and that in which the largest species are 

 found; in ^e second, they are null or but very slightly visible. 



The most southern departments of France and other coun- 

 tries of the south of Europe, produce a species — Scolopendra 

 cingulata, Lat. ; Sc. morsitans, Vill., Entom., IV, xi, 17, 18 — 

 which is nearly as large as the common species of the Antilles, 

 but has a more flattened body(2). 

 Those which form the genus Crytops, Leach, have rougher anten- 

 nae than the Scolopendrae, and their two posterior feet are more 

 slender. Leach mentions two species found in the environs of Lon- 

 don(3). 



In such as form the genus Geophilus, Id., the number of feet 

 is more than forty-two, and often considerably so. The antennae 

 consist of but fourteen joints, and their extremity is less tapered; 

 the body is proportionably narrower and longer. The eyes are but 

 slightly apparent. Some of the species are electrical(4). 



ORDER 11. 

 THYSANOURA. 

 This order consists of apterous Insects, supported by six 



(1) L. variegaius, kevilabrum, Leach, Lin. Trans., XL See also vol. Ill of his 

 Zoological Miscellany. 



(2) Scolopendra morsitans, L.; De Geer, Insect., VII, xliii, 1. For the other 

 species, see Zool. Miscell., Ill; the Scolopendra gigantea, L., Brown, Jam-, XLII, 4, 

 and other large but imperfectly described species. 



(3) Crytops hortensis, Zool. Miscell, CXXXIX, Id., lb.; Crytops Savignii. 



(4) S. eledrica, L.; Frisch., Insect., XI, viii, I; — S. occidentalis, L.; List. Itin., 



