Mr. Bates,[128] in his work on the Amazons, describes _Mygale (Theraphosa) Blondii_, a large and powerful spider of that region, as burrowing into the earth and "forming a broad slanting gallery about three feet long, the sides of which he lines beautifully with silk." This spider "is nocturnal in his habits," and maybe seen "just before sunset keeping watch within the mouth of his tunnel, disappearing suddenly when he hears a heavy foot-tread near his hiding place." [Footnote 128: Bates, H. W., _Naturalist on the Amazons_, Ed. 2. (1864).] This nest would therefore appear to have an open tube undefended by any door; but in this case the great size of the spider and the depth of the burrow, which is more than twice as long as that of the average European nests, may help to explain this apparent want of precaution. But, if we wish to learn with what different materials and by what varied means the same end of self-preservation can be attained, we have only to cast a glance at the sketch of a portion of a nest at fig. B, Plate XIII., p. 183, where it will be seen that the entrance to the nest, far from being concealed or obscured in any way, is rendered a most striking object, and one which appears devised for the very purpose of attracting attention. The nest to which I refer is the work of _Cyrtauchenius elongatus_, from Morocco, and consists, according to the account given me by its discoverer, M. Simon, of a deep cylindrical burrow in the soil, the silk lining of which is prolonged upwards for about three inches above the surface of the ground, and enlarged into a funnel shape, so that it becomes from two to three inches across at the orifice. This aërial portion being snow-white, at once attracts the eye even from a considerable distance, and the nests rising up amid the sparse grasses and other small plants which serve to support but not to conceal them, present the appearance of scattered white fungi. This is therefore quite a new type among the nests constructed by trap-door spiders, new in form and probably in function also, and I would propose to distinguish it provisionally as the _funnel type_. Now the female _Cyrtauchenius_ is, like its near relatives the _Nemesias_, a sluggish and rather helpless creature, and shows no apparent physical superiority which might countenance its dispensing with the methods of concealment which form the characteristic habit of the group. How then does this spider manage to escape its many enemies, especially the insidious attacks of the insects of the _Sphex_ and _Ichneumon_ families, which certainly abound in Morocco? Mr. Wallace, to whom I put the question, suggested that this species may perhaps be chiefly nocturnal in its habits, and that, if this is the case, the bright white and flower-like tube of the nest may possibly serve to attract night flying insects, which would thus become its prey.