THYSANOTJRA. 353 



.i fefe, Lat.; Sc. morsitans, Vill,, Entom., TV, xi, 17, 18 which 

 is nearly as lav^e as the common species of the Antilles, but has a 

 more flattened body *. 



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

 tenna- thin tii.- Seolopcndrae, and their t\vo posterior feet are more 

 >lrn,ler. L -ach mentions two species found in the environs of Lon- 

 don | . 



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

 more than forty-t\vo, and often considerably so. The antennae con- 

 sist of but fourt' -en 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 J. 



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. 



LEPISMEN^E, Lat. 



Sctiform 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 tli -M> animaU is elongated and covered with small scales, 

 frequently silvery and brilliant, from which circumstance the most 



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

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

 tor large but perfectly described species. 



ylops kortensis, Zool. Miscell. . : Id., lb., Crytops Sacignii. 



J S. elcctriea, L. ; Erisch., Insect., XI, viii, I; T. occiJc*talis, L. ; List. Itiii. 

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

 miles from the continent. Sec Zool. Miscell., Ill, Ofophilus maritimus ; CXL, 1, 2; 

 G. Longicorni$, tab. cad., 36, and some other species. 



VOL. III. A A 



