THYSANOURA. 353 



lata, Lat. ; Sc. morsitans, Vill., Entoni., IV, xi, 17, 18 — which 

 is nearly as large as the common species of the Antilles, but has a 

 more flattened body *. 

 Those which form the genus Crytops, Leach, have a rougher an- 

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

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

 don f. 



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

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

 sist of but fourteen joints, and their extremity is less tapering ; the 

 body is proportionably narrower and longer. The eyes are but 

 slightly apparent. Some of the species are electrical \. 



ORDER II, 



THYSANOURA. 



This order consists of apterous Insects, supported by six feet, that 

 experience no metamorphosis, and have, in addition, particular organs 

 of motion either on the sides or the extremity of the abdomen. 



FAMILY I. 



LEPISMENyE, Lat. 



Setiform antennae divided from their origin into very numerous 

 and small joints ; mouth furnished with very distinct and salient 

 palpi ; each side of the under part of the abdomen provided with a 

 range of moveable appendages, in the form of false feet ; abdomen 

 terminated by articulated setae, three of which are the most remark- 

 able ; body always covered with small shining scales. 



It comprises but one genus, the 



Lepisma, Lin. 



The body of these animals is elongated and covered with small scales, 

 frequently silvery and brilliant, from which circumstance the most 



* Scolopendra morsitans, L,.; De Geer, Insect., VII, xliii, 1. For the other spe- 

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

 and other large but perfectly described species. 



t Cnjfops horfensis, Zool. MisceU. ; CXXXIX; Id., lb., Cryfops Savignii. 



X S. ekctrica, L.; Erisch., Insect., XI, viii, I; — T. occideatalis, L. ; List. Itin. 

 vi ; — S. phosphorea, L. — it fell from the clouds on the decks of a vessel one hundred 

 miles from the continent. See Zool. Miscell., Ill, GeophUus maritiiinis ; CXL, 1,2; 

 — G. Longicornis, tab. ead., 3 — 6, and some other species. 



VOL. in. A A 



