244 ZOOLOGISCHE MEDEDEELINGEN — DEEL I. 



this subject Dr. K. Jordan has published a very important memoir in 

 the „Zeitschrift für wissenschaftliche Zoologie", Bd* 33, 8. 151—205, 1905. 

 In the genitalia of two seasonal forms, belonging to one species, till 

 now never anatomical differences have been found. I self have researched 

 several seasonal forms, but I never found any difference. My opinion is, 

 that in Java are living two species: baldus F. (marshalli Elw. & Edw.) 

 and another one, which is named horsfieldii by Elwes and Edwards, who 

 have cited the first description by Moore. Mr. Fruhstorfer has given the 

 name horsfieldii Moore to the Javanese race of baldus F. It is not possible 

 to decide this question before having seen Moore's types. 



At last I will give here a list of the localities and the data of the 

 Javanese specimens, most collected by Mr. Piepers and Mr. Jacobson. 



Ypth. baldus (F.). Ypth. horsfieldii Elw. & Edw. 



Batavia 6 January Goenoeng Kidoel .... February 



Tjandiroto 25 „ Semarang 15 August 



Djokdja February Semarang 5 September 



Depok March Semarang December 



Tandjong Priok. . . 25 May 



Batavia 25 November 



Batavia 9 December 



Buitenzorg 



Palaboean 



Djember 



Wijnkoopsbaai 



Mr. Jacobson has captured the two species in the same month, Fe- 

 bruary, horsfieldii Elw. & Edw. only in the vicinity of Semarang. Also 

 in December the two species seem to fly at the same time. 



Mr. Piepers mentions a specimen, which should be an intermediate 

 form between baldus and horsfieldii. I have seriously examined that 

 specimen from Djokdja, but it is undoubtfull a bcddus. 



Ypth. nigricans Snell. 



Snellen, Tijdschr. v. Ent. XXXY, p. 135, 1892. — Elwes and Edwards, 

 Trans. Ent. Soc. Lond. 1893, p. 52. — Fruhstorfer, Seitz, Grossschm. 

 IX, p. 294, 1911. — Piepers and Snellen, Khop. of Java, Dan., Satyr, etc. 

 p. 63, pi. 16, f. 40 c, 1913. 



