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Two species of Cecidomyiidae (Diptera) and their galls on stems of Verbesina alternifolia (L.) Britten ex Kearney (Asteraceae) are reexamined. Neolasioptera imprimata Gagné, new species, forms a slender, slightly tapered, woody gall. Neolasioptera verbesinae Möhn forms a much more conspicuous, ovate, relatively soft gall and is redescribed. Comparative notes on the biology of the two species are provided. Neolasioptera incisa Plakidas is a new synonym of N. verbesinae. [ABSTRACT FROM AUTHOR]

The South American moth Porphyrosela minuta Clarke (Gracillariidae) is documented for the first time in the United States, where it is already widespread. The larvae are leafminers of white clover ( Trifolium repens L., Fabaceae). Adults and larval habits are compared with those of the native Nearctic P. desmodiella (Clemens), which mines leaves of several other legumes.We summarize and add to the known distribution and parasitoid records for both species. [ABSTRACT FROM AUTHOR]