Directions for collecting and preserving insects . liable to becomedangerous enemies. Tineid lar\ ;eare rarely found in collections, and only affect the larger moths. Theyare not easily discovered, since they make no dust, as do most otherpests. Some persons have been considerably annoyed by one of thecommon clothes moths, Tineola MselUeUa (Fig. 121). Dr. Hagen foundthat it attacked freshly collected or newly spread insects, where thespreading-boards were left uncovered, but Mr. F. M. Webster has foundit injurious to the general collections at Columbus, Ohio. Of beetles, the Ptinidte are somet
Directions for collecting and preserving insects . liable to becomedangerous enemies. Tineid lar\ ;eare rarely found in collections, and only affect the larger moths. Theyare not easily discovered, since they make no dust, as do most otherpests. Some persons have been considerably annoyed by one of thecommon clothes moths, Tineola MselUeUa (Fig. 121). Dr. Hagen foundthat it attacked freshly collected or newly spread insects, where thespreading-boards were left uncovered, but Mr. F. M. Webster has foundit injurious to the general collections at Columbus, Ohio. Of beetles, the Ptinidte are sometimes found in collections but arenot common. Two species are known to attack entomological speciinens, namely, Ptinusfurj which is quite rare, in this country, but muchmore abundant in Europe, and Triboliuin fo-niyiiKttm, a cosmopolitanspecies which, however, has several times been associated in injuriousnumbers with large collections of insects imported from the EastIndies. l>ut by far the most dangerous enemies of insect collections are the. KK. 121.—Tineola biselliella: a, adult; b, larva; c,cocoon and empty pupa—skin enlarged. [109] COLLECTING AND PKESERVING INSECTS RILEY. larvib of some half dozen or more species of Dermestidte belonging tothe genera Anthrenns, Attagenus, Trogoderma, and Dermestes. Ofthese AntJircHus rarius is the more common pest, in museums, espe-cially in the Xorth and East. In the South and West Trogoderma tarxaleand T. ornatum (?) replace Anthrenus. The European species Anthrenusmusaoruin, is, on the authority of Hagen, rare in this country, andprobably occurs chiefly in collections of imported insects. It is thecommon injurious species of Europe. Anthrenus scrophularice (see ) occurs also in collections, Dr. Hagen stating that he has found itnearly as common as A. varius, and certainly more dangerous. In myown experience it is rarely found in insect collections. Two species ofAttageims (A. pellio and A. megatoma) have also been found in
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