OK ÜATOCKKA Al.lioFASI 'lATA AN'I) C.IGAS. 159 



From the cross albof asciata ç^ X g'ÌK'^'^^ $ 6 of the 14 

 hybrids are unspotted, 3 show one row, 3 two rows and 2 

 four rows of spots ; from the cross giga s cT X 11 loof asciata 

 i^ only one specimen has two rows, 7 have three rows and 

 7 others have four rows of spots. 



Besides the sex-ratio is remarkable. With both species the 

 number of males and females is about the same, with the 

 h}'brids the males dominate greatl}', in one case 1 1 (^(^ on 

 3 -9$ and in the other case 1 1 c^S on 4 ÇÇ. 



It has also been tried to cross the li}-brids between them- 

 selves and h_\'brids with one of the species. The following 

 cross-breedings were made (in the following table AG. means 

 hybrid olbofasciata (S X gig(^^ ? etc.) : 

 AG. d X AG. $, the .9 lived from October 20, 191 3 till 



March 5, 19 14. 

 AG. o' X A. 9 » 



July 24, 1914. 

 AG. c^ X G. $, 



August 12, 1914. 

 GA. d" X A. ?, 



September 9, 1914. 

 GA. d* X G. 2, 



August 9, 1914. 



In all these cases no offspring was obtained, so that one 

 ma}' consider the hybrids as being sterile. 



I succeeded however in obtaining a few descendants from 

 gigas and a female strong!)' resembling gig(zs with two 

 white spots on the elytra, which was reared on Ficus-vvood, 

 but of which the parents were not known.' 



Of the five h)-brids, which were obtained, 3 are unspotted, 

 but two show besides the small maternal spots, a third spot. 



Mr. Fred. Muir from Honolulu saw these Batorcra's on 

 a visit to the isle of Java. He has been kind enough to 

 examine the sexual organs of the males of both species as 

 well as of the hybrids. On this subject he wrote to me the 

 following : 



" . . . . gigas has thé "double ducts" or two openings for 

 the ejaculatory ducts on the apex of the internal sac. The 

 "apical armature" of the sac is membraneous without any 



