CAMPODE^K. 



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 certain wingless cockroaches. 



In Lepisma (Fig. 618, L. 4-smatoPack.) 

 there are long bristles on the tip of the ab- 

 domen, of which three are longest, while 

 Mac/tills differs in having compound eyes, 

 and longer abdominal bristles. Lepisma, 

 saccharina Linn, 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. domes- 

 tica Pack, is a beautiful white hairy 

 species, spotted with black, and is common pig. 



about fireplaces in Salem. Machilis variabilis Say (PI. 10, 

 figs. 8, 9), is dark brown, with long caudal stylets. It is com- 

 mon in the United States. M. orbitalis Pack, inhabits Idaho. 



CAMPODE^E Meinert. Under this name Dr. Meinert 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 Lepismae from 

 the Thysanura, we would suggest that the Campodeae seem 

 intermediate between the running Lepismffi and the springing 

 Podurae. The antennae 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 Haliday 

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

 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. subterraneus Pack, lives in Kentucky. The other 

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

 Westw. of Europe lives under stones. (7. Americana Pack, 

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



