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At dusk we reach the water pocket. It is in a deep gorge on the flank of this great mountain. During the rainy season the water rolls down the mountain side, plunging over precipices, and excavates a deep basin in the solid rock below. This basin, hidden from the sun, holds water the year round. September 16.
The industry of the larvæ reminds us at every point what we have learned from the Bruchus pisi. Each grub excavates a lodging in the mass of the bean, respecting the epidermis, and preparing a circular trap-door which the adult can easily open with a push at the moment of emergence.
When he excavates it in an upright tree-trunk, he usually chooses a spot beneath a limb; the limb forms a sort of rude hood, and prevents the rainwater from running down into it. It is a snug and pretty retreat, and a very safe one, I think. I doubt whether the driving snow ever reaches him, and no predatory owl could hook him out with its claw.
Like all people possessed by one idea, these ladies press everything into the service of their great project, slowly elaborating their toils, much as the ant-lion excavates its funnel in the sand and lies in wait at the bottom for its victim. Suppose that no one strays, after all, into that carefully constructed labyrinth? Suppose that the ant-lion dies of hunger and thirst in her pit?
In the summer time this subglacial stream is swollen by the surface waters descending through the crevices and the moulins which come from them, so that the outflow often forms a considerable river, and thus excavates in the ice a large or at least a long cavern, the base of which is the bed rock.
Downy woodpecker "pleeks" his happiness as he excavates the twig of a silver maple. Probably he has found the larvæ which the wood wasp left there in the fall. The big hairy woodpecker flies across the clearing with a strident scream. Next to the crow and the jay he is the noisiest fellow in the winter woods.
In general the muskrat lives in burrows, which it excavates in the banks of ponds or streams, bringing forth its young, from three to nine in number, in the nest, which it forms at the end of the tunnel. They are very prolific, producing three litters a year.
Our spider is an artist, evidently the master builder and architect of her kind. Considering her soft and pussy-like appearance no visible drills for such rough work one wonders how she excavates a burrow six inches or more deep in this hard adobe soil of the Pacific coast, and how she removes the dirt after she has loosened it.
In several respects the place grows somewhat curiously. For instance, a lawn of turf is made by the simple expedient of fencing off the cattle: the grass then grows, but if the cows get in they pull up the sod by the roots, and the wind in a single season excavates a mighty hollow where the grassy slope was before. So much for building our hopes on sand.
The adult of that designated L. TERES is over two inches long and half an inch in diameter; glossy black, with the surface delicately sculptured in wavy lines; the interior nacreous, with a bluish tinge. This excavates a perfectly cylindrical tunnel, upon the sides of which are exposed the stellar structure of the coral.
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