CAMPODEiE. 623 



ones inserted on the subterminal rings of the abdomen aid 

 greatly in locomotion, though these insects run with great ra- 

 pidity and do not leap like the Poduridce, and- thus remind 

 us, as well as in their general appearance, of cer- 

 tain wingless cockroaches. 



In Lepisma (Fig. G18) the eyes are minute, con- 

 sisting of twelve simple eyes, Avith short bristles 

 on the tip of the abdomen, of which three are 

 longest, while Machilis differs in liaA'ing compound / 

 e3^es, and longer abdominal bristles. Lepisma 

 saccharina Linn., or an allied species, is often very 

 common in houses, where it eats holes in silks and 

 silken tapestry, devours the paste and mutilates 

 the leaves of books. L. domestica Pack., is a beau- 

 tiful white hairy species, spotted with black, and is ^'^- ^^^• 

 common about fire places in Salem. Machilis variabilis Say 

 (PI. 10, figs. 8, 9), is dark brown, with long caudal stylets. It 

 is common all over the middle and southern states, and occurs 

 as far north as Salem, Mass. 



Campode^. Meinert. Under this name Dr. Mcinert has 

 established a family consisting of two but little known genera, 

 which have flat and elongated bodies and no springing appara- 

 tus, nor eyes, and though the author excludes the LepismjE from 

 the Thysanura, we would suggest that the Campodese seem 

 intermediate between the running Lepismae and the springing 

 Podurae. The antenna? are setaceous or filiform, and the feet 

 are adapted for running, with distinct, elongated, two-clawed 

 tarsi. There are two anal cerci arising from the tenth and last 

 abdominal segment. There are six thoracic spiracles, the 

 Podurae having none (Meinert). The genus Japyx of Ilaliday 

 has short, inarticulate, horny anal cerci. J. solifugus Ilaliday 

 lays few eggs, but those very large. It lives under stones and 

 when disturbed resembles " a Lithobius in the character of its 

 movements," and bears a remarkable resemblance to a young 

 Forficula. J. Saussurii Humbert lives in Mexico. The other 

 genus, Campodea, has many-jointed anal cerci. C. stajyhjlinus 

 Westw. of Europe lives under stones. C. Americana Pack. 

 has similar habits. C. Cookei Pack, lives in Mammoth Cave. 



