lAPYX. 215 



among the true Tliysanura must then for the present 

 be regarded as merely provisional. 



lapyx, Halidaj. 



*' Antennae longse, rnultiarticulatse, articulo ultimo 

 parvo. Oculi nuUi. Palpi biarticulati. 



" Cerci breves, inarticulati, cornei, forcipis instar." 



According to Meinert there are ten spiracles " situ- 

 ated in the side folds of the first ten rings." The diges- 

 tive tube is straight, and, as in the Collembola, there 

 are no Malpighian vessels. The ovaries consist of a 

 pair of wide tubes, opening at the back of the eighth 

 abnormal segment. The ganglia are large and round ; 

 there are three thoracic ganglia, and one in each of the 

 first eight abdominal segments. 



As regards the feet Haliday says, " Unguiculi bini 

 pares." Meinert, on the contrary, describes^ and figures 

 them as unequal, the lesser claw being attached (PL 

 LXV, fig. 12) as in the Collembola. Again, according 

 to Haliday the anterior abdominal segments have no 

 appendages ; Meinert, however, discovered a rudimen- 

 tary pair on each of the seven anterior segments. 



lapyx solifugus, Haliday. 



lapijx solifugus, Haliday. Trans. Linn. Soc, vol. xsiv. 

 — — Meinert. Nat. Tids., S. 3, vol. iii. 



PL LXV, fig. 13. 



About five lines in length ; ivory white, semitrans- 

 parent ; the terminal segments of the abdomen and 

 the forceps chestnut. 



This interesting species has been found under stones 

 in Algeria, Italy, Switzerland, and France, as far north 

 as Paris. It has not yet been met with in Great 

 Britain. 



1 ' Nat. Tids./ p. 434. 



