. Economic entomology . GAMASIDS. 165 CASE Sejus viduus {Koch^ Ubers., p. 92, t. x. f. 50). The shoulders longish, rounded behind and without projecting bristles. It is to this genus doubtless that another species found by M. Duges upon the leaves of Bindweed should be referred. He had gathered a quantity of these leaves on account of the great number of Tetranychi with which they were covered, and among them he found also a certain ^,^, ,,^,^,^ ^^e size of a smaii pm-s head. number of what he has named the Dermanyssus of the Bindweed ; they walked freely upon the water where these leaves were
. Economic entomology . GAMASIDS. 165 CASE Sejus viduus {Koch^ Ubers., p. 92, t. x. f. 50). The shoulders longish, rounded behind and without projecting bristles. It is to this genus doubtless that another species found by M. Duges upon the leaves of Bindweed should be referred. He had gathered a quantity of these leaves on account of the great number of Tetranychi with which they were covered, and among them he found also a certain ^,^, ,,^,^,^ ^^e size of a smaii pm-s head. number of what he has named the Dermanyssus of the Bindweed ; they walked freely upon the water where these leaves were soaking. Their size, their general form, that of the feet and the palpi, resembled those of the Dermanyssus avium; but their colour was of a greenish grey, and the intestines, and even the prolongations of its feet up to the sixth joint, were full of a green matter. He asks, was this matter the result of the suction of the vegetable juices directly from the leaf itself or indi- rectly from it after having been first swallowed by the Tetranychi on which the Gamasi fed. The same difficulty as to their food occurs in a species which M. Megnin has described (Insectologie Agricole^ 1868) under the name of the F orage mite, which is found in great quantities among old hay, and which, when shaken down from the rack on the head and neck of the animals feeding on it occasions them considerable annoyance. The species of this genus infest various insects as much as the other Gamasidse of which we have already spoken, and many species also occur in all sorts of places, and some of them even lead an amphibious or semi-marine life. In the species with such habits, we naturally feel a more parti- cular interest, for mites being land animals we may expect to find
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