Within a few days after this date I found her dead at the bottom of her tube, and at first I was inclined to fear that the treatment to which she had lately been subjected might have caused her end. When, however, I detected the brown spot on the side of the abdomen, described above, and which so strongly recalled the marks frequently observable in caterpillars attacked by ichneumons, I came to the conclusion that she had really died from the internal injuries caused by the gnawing of these cruel parasites; and that the eggs, laid long before by one of these insects, had been hatched within her body and developed into larvæ, which, living upon her tissues, had at length destroyed some vital part. It is surprising that a creature, carrying within itself such a fatal brood, should not only live, but be capable of undergoing such adventures and misadventures as this travelled spider endured with seeming indifference; but similar facts are familiar to all those who have attended to the rearing of caterpillars, and the frequent disappointment caused by the death of apparently sound specimens which have been attacked in this way is but too well known. It would appear that _Cteniza Californica_ is peculiarly amenable to captivity, and indeed to captivity of the strictest kind. My specimen lived during all the time she was in my possession in a cocoatina tin, a cylindrical box 4-1/2 in. deep and 2-3/4 in. in diameter, which always stood among the books and papers on my writing-table. It is probable that those trap-door spiders which inhabit nests with short tubes, and which therefore can be transported nest and all, would be less disconcerted by imprisonment than is the case with other kinds living at the bottom of a long burrow which it is almost impossible to carry away entire. This is borne out by what has been related (_Ants and Spiders_, p. 122) of the habits of _Cteniza ionica_ in captivity, which not only endured to have its nest set upside down in a flower-pot, but actually furnished the inverted base of the tube with a door appropriate to its new position. Canon Tristram (the well-known author and naturalist) was so kind as to send me two trap-door nests from Palestine for inspection; these were small cork nests, the doors of which resembled those of the Mentonese _Cteniza_ (_Ct. Moggridgii_), but the tubes were exceedingly short, and that of the more perfect specimen, as I gather from Canon Tristram, measured only two inches and an eighth in length when entire. The nests of _Cteniza ionica_ are but little longer, and that of the Mentonese _Cteniza_, though never so shallow as these, are far less deep than those of _Nemesia cæmentaria_, the builder of the typical cork nest.