Pemphiginæ (pemfijine)

pl. [NL. (Koch, 1854), A Member of the Pemphigına . (Cro shows natural size.) two oblique veins, and the honey-tubes tuberculiform if present. It contains a number of widespread genera, of which Schizoneura and Pemphigus are the most notable. The body is obese and obtuse, and is covered with a cottony secretion, and the antennæ are six-jointed. These aphids live chiefly on forest trees and shrubs, seldom molesting cultivated fruit-trees. Also spelled Pemphigina. See also cut under Pemphigus. pemphigoid (pem'fi-goid), a. [ E. pompholyx.] 1. An affection of the skin, consisting of eruptions (bullæ) of various sizes, from that of a pea to that of a walnut, usually with accompaniment of fever. Also called pompholyx and bladdery fever.-2. In entom.: (a) [ cap.] A genus of plant-lice or H Poplar-leaf Gall-louse ( Pemphigus populicaulis). a, gall, just forming, beneath; b, gall, just forming, above; c, perfect gall, beneath; d, e, young double galls; f, stem-mother (line shows natural size); g, winged female (cro shows natural size). aphids of the subfamily Pemphiginæ (Hartig, 1841). They are usually large species, with a copious waxy secretion, which deform the leaves of certain plants and sometimes produce galls. Thus, P. populicaulis makes galls at the base of the leaves of the cottonwood ( Populus mon i lifer a). (b) An aphid of the genus Pemphi- Pemphi gus: as, the vagabond pemphigus, P. vagabunda. Pemphredon (pem-frē'don), n. [NL. (Latreille, 1796), Pemphredon annul at us. (Cro shows natural size.) 4367 θρηδών, ἀνθρεδών, etc., a hornet: see Anthrenus.] A genus of wasps, typical of the family Pem phredonidæ, having the fore wings with two recurrent nervures, one arising from the first and the other from the second submarginal cell. P. lugubris, a common European wasp, burrows in decaying posts, rails, and logs, and provisions its cell with plant lice. P. minutus burrows in the sand.