Page:Transactions NZ Institute Volume 15.djvu/80

Thorax generally with a very small crest, or smooth. Antennæ in male biciliated with fine long cilia. Palpi moderate, porrected, second joint triangularly scaled. Forewings with costa simple in male. Hindwings not broader than forewings. Forewings with 12 veins, 7 and 8 separate, 7 to hindmargin. Hindwings with 8 veins, 3 and 4 from a point, 5 slightly (or rarely strongly) approximated at base to 4, 6 and 7 stalked (rarely separate).

Distinguished from Tortrix by the long fine biciliations of the antennæ, and usually by the stalking of veins 6 and 7 of the hindwings. There are several Australian species. Of the three given hereafter, D. imbriferana is a typical species of the genus. D. incessana differs in some respects, having veins 6 and 7 of hindwings separate, and more elongate palpi, for which reasons I formerly referred it to Arotrophora, but it is without the characteristic antennal dentations of that genus, and the antennæ appear here to furnish the most reliable characters. D. jactatana also diverges in respect of the separation of veins 6 and 7 of hindwings, and in having vein 5 closely approximated to 4 at base; acquaintance with the male shows its former conjectural position to have been erroneous. The three species are very dissimilar and easily distinguished:—

Minor, alis ant. ochreis, sæpe fusco-suffusis, postice fusco-maculatis, striga disci antica sinuata nigra; post. griseis.

Male, female.—18–19 mm. Head, palpi, antennæ, and thorax brownish-ochreous or fuscous; palpi rather elongate, externally dark fuscous. Abdomen ochreous-grey. Legs whitish-ochreous, anterior and middle pair suffused with dark fuscous, except towards apex of joints. Forewings moderate, somewhat dilated posteriorly, costa moderately arched, hind-margin slightly sinuate, not oblique; varying from light brownish-ochreous to fuscous, paler towards anterior half of costa; a sinuate blackish streak in disc, reaching from near base to middle, anterior extremity obscurely bent downwards to inner margin; five or six small dark fuscous spots on costa, the two last coalescing below costa; a small dark fuscous spot in disc beyond middle, another on middle of hindmargin, and a third on anal angle; all these spots obsolete in darker specimens: cilia light ochreous, with a fuscous line near base. Hindwings grey; cilia whitish-grey, with a grey basal line.