196 OrpDER—THYSANURA. ‘ 
They reside in the earth, and may occasionally be seen whilst digging in garden ground. They have recently 
received considerable attention from the fanciful theory which has been applied to them by Sir John Lubbock, 
that they constitute the primary type of form from which the whole of the class of insects has been evolved. 
Genus—IAPYX. 
(Haliday, Trans. Linn. Soc. xxiv, p. 442.) 
This Genus comprises species of larger size than the Campodew, which bear a striking resemblance to im- 
mature Forficule, the body being terminated by two exarticulate horny, forceps-like appendages. Dr. Meinert 
compares the motions of these insects to those of the Myriapodous Lithobii. 
Srecres 1—IAPYX SOLIFUGUS. 
(Haliday, Op. cit. pl. XLIV ; Meinert, Op. cit. supr.) 
Inhabits mountainous districts in Italy (Tuscany, the Roman territory, aud Naples); also near Toulon, 
Algiers, and Constantine (Lucas, Ann. Soc. Ent. France, 1867, Proc. p. 20); also taken by him in a cool plant- 
house in the Jardin des Plantes, Paris. 
Spectres 2—IAPYX SAUSSURII. 
(Humbert in Guérin-Méneville, Mag. Zool. 1868, 2nd Ser. vol. xx, p. 351, pl. XXII, figs. 1-5.) 
Habitat ; Mexico, Santa Cruz, Moyoapan, near Orizaba (M. Sumichrast). 
Spectres 3—JAPYX WOLLASTONII. Westw. 
Prate XXXVII, Fie. 3. 
Capite obovato: antennis capite haud multo longioribus, articulis tribus basalibus (fig. 32) erassioribus, 
reliquis intus setosis, articulis transversis, sensim ad apicem (fig. 3) attenuatis ; prothorace parvo ovali depresso, 
medio linea longitudinali tenui impresso; abdominis segmento septimo dorso postice profunde emarginato, 
segmento octavo infra paullo supra segmentum sequens producto; segmento nono brevissimo subtus in medio 
profunde inciso (fig. 3c); segmento ultimo subquadrato; forcipis margine interno intus crenulato ante medium 
dente conico armato ; pedibus brevibus compressis, femoribus latis et ante medium ut videtur subarticulatis. 
Long. corp. lin. 4. 
Habitat ; the almost inaccessible island ‘ Bugio,’ the Southern Deserta, near Madeira (D. Wollaston). 
In Mus. Hopeiano Oxoniz. 
The specimens here described are in a dried condition, mounted on card. On examining the antenne very 
carefully, the joints appear to be transverse, but connected together by a membranous tube as long as the joints 
it connects, which shrinks in drying so as to draw the dise of the second of each pair of jomts into the cup 
formed by the cavity of the apex of the preceding joint. 
