INSECTA MADERENSIA. 375 



The representatives of the second subsection oi Atlantis, — which I would detin(> 

 as the aberrant members of the group, and perhaps in reality to be considered as 

 generically distinct, — may be at once- recognised by their freedom from the elon- 

 gated additional pile (except at the extreme apex only) with which the elytra in 

 the previous division is more or less densely besprinkled, and by the similarity of 

 their legs in both sexes, — which last are not merely of equal (or, at any rate, of 

 subequal) thickness in the two, biit are, likewise, unexpanded at theu' termination 

 in the males, and have the apical spine which characterizes the normal forms 

 either entirely absent, or else so far reduced in size that it may be practically 

 regarded as svich. They are insects, moreover, of a less sylvan natiu^e, being, witli 

 a single exception, confined, so far as I have hitherto observed, to barren, sulj- 

 maritime spots altogether destitute of trees, — residing beneath stones, but being, 

 like most of the Cyclomkles, of exceedingly gregarious habits. It is worthy of 

 remark, that, up to the present period, I have detected but a solitary species in 

 Madeu'a proper (namely, the A. excelsus, — the one just referred to, as ranging 

 within the wooded districts), five, out of the remainiug six, being peculiar to Porto 

 Santo, and the other to the Ilheo de Pora, — the little island which constitutes th<^ 

 detached extremity of the Sao Lauren90 promontory, the most eastern point of 

 Madeu-a. 



The A. namciilaris, which, on accoiuit of the comparatively bright, golden-green 

 scales with wliich it is tessellated, approaches in general aspect some of the typical 

 members of the genus, may be readily distinguished from the rest of the present 

 di\dsion by its remotely punctured prothorax, and by the softer, more elongated, 

 and silken additional hairs with which the apex of its elytra is beset, — whilst the 

 ciu'iously constricted, or pinchcd-in, structure which is so apparent in that portion 

 of its sm'face, and which causes the suture to project like a keel, giving a boat- 

 shaped appearance to that particular region of its body, will serve to sej)arate it 

 from the whole of the other species, normal and aberrant, here described. In the 

 somewhat slender scape of its antennae it almost agrees with the A. inconstans, 

 whilst in the equaUty of the fu'st and second joints of its funiculus it recedes from 

 that insect, as well as from the A. instabills, A\itli which it was foimd in comijany. 

 And, upon the whole, I am inclined to think that it may perhaps have a greater 

 affinity with the unique A. claratits (though widely distinct from it specifically), 

 than with any othev Atlantis hitherto discovered. The only three specimens which 

 I liave seen, were captiu-ed by myself in Porto Santo, during my residence there 

 with the Hev. W. J. Armitage, in December 1848, — but whether taken on the 

 Campo de Baxo or at a higher elevation, I cannot at present recall. 



286. Atlantis inconstans, WoU. 



A. elougato-subovatus piceus vel fusco-piceus, pube ciuereo-subcuprescente vel cinereo-subviridescente 

 diliita depressa parce variegatus, protliorace deuse punctato, elytris punctato-striatis, ad apicern 



