Abstract
The distribution ranges of Dicraeus nartshukae Kanmiya (Diptera, Chloropidae) and its host plant Leymus mollis (Trin.) Pilger are discussed. Larvae of D. nartshukae develop in unripe seeds of Leymus mollis but not in the seeds of the closely related L. villosissimus and L. interior. The spikes, spikelets, and glumes of L. mollis are larger than in other species, and usually softly hirsute. The glumes of L. villosissimus and L. interior possess dense hirsute pubescence which appears to be unfavorable for oviposition of Dicraeus nartshukae. The absence of seedeating Dicraeus on L. villosissimus and L. interior is an additional argument in support of distinctness of these species. The distribution range of Dicraeus nartshukae is meridional, or Pacific littoral.
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