the Atlantic Cossonides. 395 



tlse reception of which I founded (in 1857) the present genus, is, 

 as lias been already stated, so closely allied in external aspect 

 and contour to the Pentatemniis arcnariiis (found in similar spots 

 in the three eastern islands of the Canarian archipelago), that at 

 first sight it would undoubtedly be regarded as congeneric with 

 it. Yet, in spite of this wonderful similarity in fades and habits, 

 the Leipuviniala calcctratum recedes from Pcnlaleunnis in many of 

 the most important details of its structure, — though esj)ecially, 

 perhaps, in possessing a 7- (instead of a 5-) jointed funiculus. 

 In their pilose bodies and sub-fossori:d habits (two most re- 

 markable characters for the Cossoiiides), as well as in their sub- 

 connate elytra, obsolete wings, almost unexpended antepenulti- 

 mate tarsal-joint, and the more or less produced (or spiniform) 

 inner apical-angle of their tibiae, the two insects are nearly coinci- 

 dent; nevertheless, in Leiponirnata the eyes are entirely absent 

 (there being no indication of tiiem whatsoever, even beneath the 

 microscope); the antennae (although short) are rather longer and 

 thinner, and implanted a little nearer to the apex of the rostrum; 

 the prothorax is smaller and less conical, the scutelkim is not 

 quite obsolete (being just traceable luider a high magnifying 

 power), the tarsi are slenderer, and the apex of the tibiae is very 

 diiTerently modified, — the large outer hook (vide "19, 3 b) being 

 more obtuse and very much less deflexed (so that the four hinder 

 ones are quite apparent when the insect is viewed from above), 

 whilst the inner terminal- spine is considerably larger and more 

 elongated. In Leiponnnala, moreover, the hinder tibise are less 

 straightened than in Pentatemniis, and the base of their apical- 

 hook is not compressed and developed as is the case in that 

 genus. 



29. Leipommata calcaratum, Woll. (PI. 19, fig. 3.) 

 Lcipommala calcaratum, Woll., Cat. Mad. Col. 101 (1857). 



Habitat Portum Sanctum (insularum Maderensium), ad radices 

 plantarum (praesertim Jrundo donax) in colliculis arenosis mox 

 pone Oram maritimam crescentium, mense Maio A. D. 1855 a 

 raeipso repertum. 



Taken sparingly at the roots of sand-plants (especially the com- 

 mon Arundo donax), and generally at a considerable distance 

 beneath the surface, on the sand-hills of Porto Santo (immediately 

 behind the sea-beach), during May, 1855. 



Genus Mesoxenus, nov. gen. (PI. 19, figs. 4, 6.) 

 I need not give the structural details afresh of the two singular 



D D 2 



