ORDER THYSANOURA. 145 



and covered places. All the kno"\\Ti species belong to Eu- 

 rope. * 



LepismAj Lin.^ Forhicina, Geoff. Leach, 



which have the eyes very small, very much separated, and 

 composed of but a small number of grains ; the body flatted, 

 and terminated by three threads of the same length, inserted 

 on the same line, but employed in leaping. 



Their haunches are very large. INIost part of the species 

 are found in the interior of houses. 



The Sugar Lepisme {L. Saccharina, Lin.), Forbicini, 

 Plate, Geoff. Insect. IL xx. 3. Schoeff. Elem. Entom. Ixxv., 

 four lines long, of a silvery and somewhat leaden colour, 

 without spots; is, as is said, originally of America, but has 

 become common in our houses. 



With it, and in the same places, is often found the Baiided 

 Lepisme (Vitfata, Fabr.), Avhich has the body ashen, punc- 

 tuated with four stripes of the latter colour along the back 

 of the abdomen. Other species are to be found under 

 stones. 



The second family of the Thysaxoura is that of the 



PoDURELL.E, Lat., 



whose antennae consist of four pieces, and the mouth presents 

 no distinct and prominent palpi. The abdomen is termi- 

 nated by a forked tail, which, in a state of repose, is applied 

 under the belly. It is employed in leaping. In Linnaeus 

 this family constitutes but a single genus — 



PODURA. 



These insects are very small, very soft, and elongated, with 

 the head oval, and the two ej^es composed each of eight 



* Lepisma polupoda, Lin.; L. Saccharina, Vill. Entom. Lin. IV. xi, 1.; 

 Roein. Gen. Insect, xxix. 1,; Forbicine Cylindrique, Geoff.; Lepisma The- 

 zeana. Fab. ; PetroUus Maritirmis, Leach. Zoolog. Miscellan. CXLV. 



VOL. XIV. L 



