Plutella crucifer arum

(Cro shows natural size.) They are small, with antennæ not thickened at the base, erect palpi, and the sixth and seventh veins of the hind wings separate. The larva skeletonizes leaves, and pupates in a gauzy cocoon. P. crucifer arum ( xylostella ) is a turnip and cabbage-pest of cosmopolitan distribution. 2. [l. c.] A member of this genus; especially, in the United States, P. crucifer arum , known as the cabbage - plutella . In England and the British colonies it is known as the diamond back . Plutellidæ (plö-tel'i-dē), n . pl . [NL., Plutella +-idæ.] A family of tineid moths, typified by the genus Plutella . The head is woolly, and the palpi are provided with a strong bunch of scales on the middle joint below; they have the peculiar habit of holding the antennæ straight forward when at rest (most other tineids holding the antennæ back on the wings). The family contains about 6 genera, of which Ceros tom a is the most extensive. pluteus (plö'tē-us), n.; pl. plutei (-1). [L., also pluteum , a shed or mantlet to protect besiegers, a breastwork, parapet, a headboard of a couch or bed, a partition, etc.] 1. In anc . Rom.arch ., a barrier, as any construction of boards, osiers, grating, or other light work, placed between the columns of a portico; a light wall occupying the lower part of an intercolumniation; a balustrade or parapet crowning a building or a part of a building; also, a shelf fixed to the wall; the headboard of a bed.-2. In anc. Rom. mil it . eng in .: (a) Boards or planks placed on the fortifications of a camp, or on movable towers or other military engines, to form a kind of roof or shed for the protection of the soldiers. (b) A movable gallery on wheels, shaped like an arch-covered wagon, in which a besieging party made their approaches.-3. In zoöl . , a larval stage of the echinopædia of certain echinoderms, as a holothurian, ophiurian, or echinid. It is known as the IMG:content-0482.png:[merged small][merged small][ocr errors][merged small][merged small][merged small][merged small] A. Echinopædium of Echinus pulchellus, gastrula stage: a , mouth; b , intestine; c, anus. B. Fully developed echinopædium or pluteus of the same a ', mouth; b , stomach and intestine; c, anus: d , d , proce es of body containing prolongations of internal skeleton. C. Echinopædium of an echinid advanced so far that spines, pedicels, and pedicel lariæ are visible. painter's - easel larva , from its shape, and was originally described as a distinct genus by Müller in 1846. Compare cuts under Bipinnaria and echinopædium . Pluto (plö'to), n. [L., Πλούτων , poet. also Πλουτεύς , Pluto, orig. epithet of Hades, the underworld (as a source of grain, etc.), Plutus .] In Rom. myth ., the lord of the infernal regions, son of Saturn and brother of and Neptune. He is represented as an elderly putevith a dignified but severe aspect, often holding in his hand a two-pronged fork. He was generally called by the Greeks Ilades , and by the Romans Orcus , Tartar us, and Dis . His wife was Proser pine, daughter of Jupiter and Ceres, whom he seized in the island of Sicily while she was plucking flowers, and carried to the lower world. See cut on following page. Pluto monkey, Cercopithe cus plu to , of western Africa. plutocracy (plo-tokʻrā-si), n . [ ria, an oligarchy of wealth, -κρατία , κρατεῖν , rule.] Government by the wealthy cla ; the rule of wealth; also, a cla ruling by virtue of its wealth. Also plutarchy. plutocrat (plö'to-krat), n. [ plutocracy .] One who rules or sways a IMG:content-0483.jpg:[blocks in formation] vius, rainy: see pluvious . II. n . pluvial (Sp. capa pluvial ), pluvial is , etc., a rain-cloak: see I.] I. a. 1. Rainy; Rainy; humid; relating to rain; also, very rainy; y; characterized by great or extensive rainfall.-2. In geol . , depending on or arising from the action of rain. The particular kind of denudation effected by means of rain is called pluvial denudation. Huxley , Physiography, p. 131.