74 D. S. FLETCHER 



Holotype <$, West Malaysia: Perak, vii-viii. 1895 (Lakatt & Pamboo), Geometri- 

 dae genitalia slide no. 7112, in BMNH. 



Paratypes. West Malaysia: Penang, xi. 1896 (Curtis), 1^,1$; ibidem, 

 7.xii.i898, 1 $; Penang, 2260 ft, 3.xii.i898 (5. 5. Flower), 1 $; Penang, xii. 1915-ii. 

 1916 (C. L. Collenette), 1 $; Penang Hill, 2400 ft, iv-v. 1937 (M. R. Henderson), 1 <J; 

 Perak, holotype data, 1 <J; Perak 2000-3500 ft (W. Doherty), 1 $; Perak, Larut 

 Hills, 3700 ft, 10.ii.1932 (H. M. Pendlebury), 1 $; Selangor, Bukit Kutu, 3300 ft, 

 23. ix. 1932 (H. M. Pendlebury), 1 $; ibidem (A. R. Sanderson) , 1 <$, 1 $. Singapore: 



1 (J; ibidem (H. N. Ridley), 3 $. Riouw Archipelago: Doerian, vi. 1923 (Dammer- 

 man), 1 $ (RNH, Leiden). Sumatra: Brastagi [4500 ft] (Mrs P. G. Souter), 1 $; 

 Padang, Sidempoean, xii. 1902-i. 1903, 1 <J; Padang, 1 <$; Lebong Tandai, 1920- 

 1923 (C. J. Brooks), 1 (J, 2 $; ibidem, 23-30.iv.1921, 1 <$ (all BMNH); Wai Lima, 

 Z. Sum., Lampongs, xi-xii. 1921 (Karny), 1 $ (RNH, Leiden). Java: (Blume), 



2 S (RNH, Leiden); Java, Coll. Piepers-Snellen, 1 <$ (RNH, Leiden); E.I.C. [East 

 India Company], ? Java, 1 ^ (BMNH); Soekaboemi, 1800ft, ii-iii. 1936 (M. E. 

 Walsh), 1 $; Preanger, Mt Djampang, 1500-2500 ft, ii-iii. 1936 (M. E. Walsh), 

 1 S; Mts Djampangs Wetan, Bibidjilan, xii. 1937 (M. E. Walsh), 1 $ (all BMNH); 

 Batavia, 1884, 1^,1$; ibidem, 1888, 1 $; Buitenzorg, Bogor, 1 J, 1 $ (all RNH, 

 Leiden); Buitenzorg, 800 ft, iv. 1923 (H. M. Pendlebury) , 1 $ (BMNH); Java merid., 

 1500 ft, 1891 (H. Fruhstorfer), 1 <$ (UM, Oxford), 1 $ (BMNH). Borneo: Labuan 

 (Pryer), 1 $; Elopura (Pryer), 1 ^; Brit. N. Borneo (Pryer), 1 $ (UM, Oxford); 

 Sarawak (Wallace), 1 $; Sandakan (D. Color), 1 $; Bidi, 1907-1908 (C. /. Brooks), 

 1 $; foot Mt Dulit, junction [of rivers Tinjar & Lejok, 27.ix.1932 (B. M. Hobby 

 & A. W. Moore), 1 <^; 85 miles above Pontianak (Simons & Meligan), 1 $. 



The FLAVICOSTA -Group 



In each of the four included species the hyaline area of the wings is tinged with 

 yellowish green; the non-hyaline terminal area is predominantly greyish red with 

 a well marked cinnamon-coloured subterminal fascia; the fore wing measures 

 14-18 mm in the male, 12-17 mm m the female. The species-group is characterized 

 in the male genitalia by the long, slender uncus, the slender arms of the gnathus 

 that fuse medially without forming a ventral plate and the asymmetrical valves, 

 which are digitate on the left-hand side and bifurcate or dilate and incurved on the 

 right-hand side. In the female genitalia there is a hollow process, anteriorly in- 

 clined and tapered, at the right-hand side of the sterigma that might engage the 

 fulcrum during copulation. 



Key to Species and Subspecies 



1 Right valve bifurcate, twin apices equal or unequal; dorsal process grossly 



dilate and setose in basal third ........ 2 



- Apex of right-hand valve rounded, narrowly or broadly; dorsal process a 



little dilate and setose in basal third ....... 3 



2 (1) Apex of right valve with two tapered arms equal in length. Fulcrum shorter 



than aedeagus ......... flavicosta (p. 75) 



