132 



BRISTLE- TAILS AND SPRING-TAILS. 



smaller than the Lepismidae, aud in some respects are interme- 

 diate between that family and the Poduridse (including the 

 Smynthuridte). 



In this family the body is long and slender, and the segments 

 much alike in size. There is a pair of spiracles on each thoracic 

 ring. The mandibles are long and slender', ending in three or 

 four teeth, and with the other appen- 

 dages of the . mouth are concealed 

 within the head, "only the tips of the 

 palpi (aud of the maxilla3 when these 

 are opened) projecting a very little 

 beyond the rounded entire margin of 

 the epistoma," according to Haliday. 

 The maxillge are comb-shaped, due to 

 the four slender, minutely ciliated 

 spines placed within the outer tooth. 

 The labium in Japyx is foui'-lobed and 

 bears a small two-jointed palpus. The 

 legs are five-jointed, the tarsi consist- 

 ing of a single joint, ending in two 

 large claws. The abdomen consists 

 of ten segments, aud in Campodea 

 along each side is a series of minute, 

 two-jointed appendages such as have 

 been described in Machilis. These are 

 wanting in Japyx. None of the spe- 

 cies in this family have the body cov- 

 ered with scales. They are white, with a yellowish tinge. 



The more complicated genus of the two is Japyx (Fig. 153, 

 Japyx solifugus, found under stones in Southern Europe ; a, the 

 mouth from beneath, with the maxillse open ; b', maxilla ; d, man- 

 dible ; c, outline of front of head seen from beneath, with the 

 labial palpi in position) which, as remarked by the late Mr. Hal- 

 iday (who has published an elaborate essay on this genus in the 

 Linnsean Transactions, vol. 24, 18G4), resembles Forficula in the 

 large forceps attached to its tail. An American species (J. Saus- 

 surii) lives in Mexico, and we look for its discovery in Texas. 

 Campodea (C. staphyliuus Westw., Fig. 154, enlarged; a, 

 mandible; b, maxilla), otherwise closely related, has more rudi- 

 mentary mouth-parts, and the abdomen ends in two many 

 jointed appendages. 



154. Campodea staphyliuus. 



