RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN 241 



XVI. - CONTRIBUTION TO THE KNOWLEDGE OF THE JAVANESE 

 YPTHIM A- SPECIES. 

 BY R. VAN EECKE. 



Messrs. Henry J. Elwes and James Edwards have carefully studied the 

 species of the genus Ypthima and have published the important results 

 of their researches in the Transactions of the Entomological Society of 

 London, 1893, part I, pp., 1 — 54. The limited acquaintance with the 

 Dutch language and the want of sufficient Javanese material have pre- 

 vented the above named authors from doing justice to the species, de- 

 scribed by the late Mr. P. C. T. Snellen in the „Tijdschrift voor Ento- 

 mologie", XXXV, pp. 133 and 135. In recent years, 1910 and 1913, 

 Messrs. H. Fruhstorfer and M. C. Piepers have maked a more particular 

 study of the Indo- Australian and Javanese species of Ypthima. The 

 results of Mr. Fruhstorfer's researches are published in the work of 

 Prof. A. Seitz, and those of Mr. Piepers' in „The Rhopalocera of Java". 

 The latter has not examined the anatomical characters and has separated 

 the Javanese species, just as Mr. Snellen did, by the outward morpho- 

 logical characters only. The work of Messrs. Elwes and Edwards has 

 undoubtfully shown to us the great systematic value of the modification 

 of the male genitalia. Arranging the large number of Javanese Ypthima- 

 specimens in the collection of the Leiden Museum of Natural History, 

 I have taken the fortune at the tide to examine the male genitalia of 

 the species not examined by Messrs. Élwes and Edwards, and to compare 

 the descriptions in the four named publications. 



Ypth. fasciata Hew. 



Hewitson, Trans. Ent. Soc. of London, (3) 2, p. 287, 1864. — Elwes 

 and Edwards, 1. c. 1893, p. 44. — Fruhstorfer, Seitz, Grossschm. IX, 

 p. 237, pi. 99 g, 1910. — Piepers and Snellen, Rhop. of Java, Dan., 

 Satyr, etc. p. 52, pi. 16, f. 39, 1913. 



The female specimen, collected by Mr. Piepers in the Resid. Besoeki 

 in East-Java in the year 1887, is not a fasciata Hew. but really a 

 jarba Nicév. Ypth. fasciata from Borneo is much smaller, darker coloured 

 and it possesses a very characteristic continuous series of ocelli on the 

 under side of the hind wing. The number of these ocelli is generally 

 seven. The specimen from Besoeki shows only five well developed ocelli 

 and one small second ocellus under the apical one. This fact happens 



