290 THE ENTOMOLOGIST. 



graciliores ; tarsi omnes concolores ; alae ampliores ; anticarum 

 stigma et areola radialis latiores ; posticarum area radialis a 

 branchiali remota, et in 2 areolas partita.'' 



It seems strange that Marshall, when preparing his Monograph, 

 should not have noticed the discrepancy between the descriptions 

 of AVesmael and Haliday. The species appears to be scarce, the 

 only specimen I have seen being in Morley's collection, a female 

 ■which was captured by the late Eev. E. M. Blomfield at Guestling 

 in 1889. This insect expands 16 mm., and agrees in every par- 

 ticular with Haliday's description, the radial areolet of the hind 

 wing being very distinctly geminated by a transverse nervure. 



Z. discolor (Wesmael). (Fig. 3.) — Strange to say the male 

 of this species is unknown. Wesmael, the original describer, 

 saw only three females; Bignell bred the same sex only; Morley's 

 single specimen is a female, as are also all the many specimens 

 I have bred. 



A large and graceful insect, 6^ to 8 mm. in length, and 

 expanding 15-20 mm. I possess a specimen which is but 5 mm. 

 in length and expands only 12 mm. ; this case, however, is 

 quite exceptional, and may probably be attributed to malnutri- 

 tion of the host. The wings are somewhat infumated, the 

 apical halves more distinctly so, and noticeably iridescent. 

 Marshall very correctly describes the cocoon as " elongate, oval, 

 white, and thin, with a medial zone of a denser texture forming 

 a white band." This medial band is scarcely visible when the 

 cocoon is empty. The cocoon is much thinner and more shining 

 than that of Z. infamator, 7^ to 11|- mm. in length (fig. 10). It 

 is constructed underground. 



Bred by me many times from larvae of Cahera pusaria from 

 July 27th to August 8th, and again from September 27th to 

 October 10th ; also frequently from larvae of Boarmia repandata 

 between May 5th and May 28th ; and once from a larva of 

 Gonodontis hidentata, August 18th, 1912. 



In October, 1911, I took a small larva of Boarmia repandata, 

 which, being kept in a warm cupboard, fed up, and when full 

 grown produced a larva of this parasite on January 31st, 1912. 

 From this I should judge that in the ordinary way the species 

 passes the winter within the body of its host, either as an ovum 

 or small larva. 



NEW SPECIES OF GEOMETKID^ FEOM FORMOSA. 



By a. E. Wileman, F.E.S. 



Semiothisa kanshireiensis, n. sp. 

 2 . Pale brown thickly sprinkled with dark brown and blackish ; 

 subbasal and medial lines blackish, each originating in a black spot on 

 the costa, slightly curved, interrupted and edged with orange ; post- 

 medial line blackish, indented below costa, wavy towards dorsum. 



