Miscellaneous Genera VI
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Chorsia brewini sp. n.
, 9-10mm. The forewings are a pale bone colour with greyish clouding, and curved fasciation in the medial to postmedial area: a fine dark brown arc from a weak costal triangle that runs through the transverse discal dash; a band of ground colour; a white band; a greyish band only slightly darker than the ground. All except the dark brown arc are rather diffusely defined, and even that broadens and becomes more diffuse at the dorsum. The male abdomen suggests a relationship to the much more heavily marked and variegated maculosa and griffini: the prominent, highly developed coremata that bear dark brown scales; the central apodeme on the seventh sternite. In the genitalia, the valves are slightly shorter than in maculosa and centrally slightly broader because of the more evenly convex costal margin. The aedeagus is narrow as in griffini, the vesica has the diverticula even narrower, and the most distal one has a terminal cornutus and each has more general rugosity more basally. Chorsia aroa Bethune-Baker (New Guinea, Seram) comb. n. has somewhat similar facies but the male genitalia (slide 18908); Seram) have broad, distally bilobed valves that are slightly rugose, and the eighth segment does not have highly developed coremata. The species also bears some resemblance in facies to the Japanese C. albicincta Hampson comb. n. (see discussion of Neustrotia Sugi above), but in this the curved fasciation of the forewing is more distal, and the male genitalia differ in valve shape and ornamentation and in having massive cornuti in the aedeagus vesica.


Chorsia brewini

Holotype . SARAWAK: Gunong Mulu Nat. Park, R.G.S. Exped. 1977-8 (J.D.Holloway et al.), Site 25, April, G. Api, 900m, 427550, lower montane forest, BM noctuid slide 18515.

Paratypes: 12 as holotype; 1 general data as holotype but Site 26, April, G. Api Pinnacles, 1200m 428545, open scrub.

Geographical range. Borneo.

Habitat preference. The species is common in lower montane forest on limestone.

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