372 Dr. F. Meinert on the Campodese, 



of the rings of the thorax and the first eight abdomen-rings 

 (inchiding the segmentam mediale) have one each, so that there 

 are eleven in all. 



The digestive tube, of which the duodenum occupies the 

 greater part, is quite straight. I have failed to discover Mal- 

 pighian vessels, nor do I think they exist either in Japyx or in 

 other Thysanura. 



The ovaries consist of a pair of wide tubes, opening at the 

 back of the eighth ventral shield. The eggs were, in the in- 

 dividual I examined, few, but very large (9 millims. long), the 

 germinative cell large and easily distinguished from its neigh- 

 bours. 



Japyx solifuyus, Hal. 



Testaceus, abdominis segmentis ultimis atque forcipe prresertim 



obscurioribus. 

 Antennse 'j- longitudinis corporis breviores, 18-3l-articulatae. 

 Forceps robustus, longitudine scuti dorsalis segment! ultimi ; 



lateribus interieribus dente instructis. 

 Long. 8"5 mitttm. 



I am indebted for the specimens which I have been enabled 

 to examine to the courtesy of Dr. V, Bergsoe, who collected 

 most of them at Genezzano, in the Sabine Mountains, and at 

 Mount Casino, near St. Germano, in the year 1862. It seemed 

 to be a mountain species, as he had never seen it in the Cam- 

 pagna : his specimens were found singly, under large stones or 

 dry moss on the rocks in dry places ; they tried to escape by 

 running actively about, and resembled a Lithobius in the cha- 

 racter of their movements. 



The present paper was ready for publication when Mr. Hali- 

 day's description of Jnpyx, in the ' Transactions of the Linnean 

 Society,' vol. xxiv. p. 441, came to my hands; and I have there- 

 fore scarcely been able to refer to it, except so far, that I have 

 substituted the name proposed by Mr. Haliday for the one I 

 had myself intended for this remarkable animal. With regard 

 to Mr. Haliday's figures, I would observe that the principal figure 

 seems to have been made after a dried specimen, while mine 

 had fortunately been preserved in spirit and thus retained their 

 natural elegance of form. I also differ from Mr. Haliday in the 

 interpretation of the organs of the mouth. AVhat he considers 

 to be labial palpi, I believe to be maxillary palpi ; what he de- 

 scribes as labium (fig. 2) are, in my opinion, the maxillae (with- 

 out the inner lobes) together with the paraglossse (but withoiif 

 the lingua). Mr. HaHday's maxillae are, in my opinion, merely 

 the interior maxillary lobes; and fig. t I suppose to be a part of 



