igoy.] Records of the I iidiaii Mitseiim. 93 



Rosapha Wlk., i860. 



Pr. Linn. So., iv, 100. 



Osten Sacken corrects the author's error in saying 2 instead of 

 4 spines to the scutellum, and Meijere's splendid coloured plate 

 of bimaculata shews 4, the inner pair much the longer. 



R. hahilis Wlk., i860. 



Pr. Linn. So., iv, 100. 



h 9- Long. 7 mm., Makessar (Celebes). Osten Sacken reports 



a 5 from Kandari (Celebes) dated April 1874, and observes that 



the extent of black in the abdomen varies, and that the black mark 



on the thorax is sometimes wanting. 



R. bicolor Big., 1879. 



{CalochcEtis) Ann. So. Ent. Fr. (1879), 189. 



{Calochoetis, misprinted Calcochcetis) Big,, Bull, So. Ent. Fr. 

 (1879), p, Ixxiv. 



9 Manila. Type in Bigot's Collection. 



R. bimaculata Meij., 1904. 

 Bijd. Dierk., xviii, 96 ; pi. viii, 13, 14. 



'b Java. Long. 6 mm. Gunong Tji Salimar. W. Preanger 

 (Java). 



I should not be surprised to find that the three just mentioned 

 represent but a single species. Walker describes both sexes, men- 

 tioning that the abdomen is clear tawny in the 'b and with the 

 centre blackish in 5 . Bigot says " centre of abdomen blackish" 

 (a $ ) and Meijere differentiates his species from Bigot's by the clear, 

 reddish yellow abdomen. His type is a b and perhaps he had not 

 seen Walker's description of sexual differences. 



The three descriptions read surprisingly alike, and the only 

 character I can find that may separate the species is that bicolor 

 and bimaculata have the brownish cloud towards the tip of wings 

 separated by a clear hyaline space from the dark stigma, which 

 clear space is not mentioned in Walker's species. 



Osten Sacken has specimens from the PhiHppines shewing the 

 hyaline space referred to by Bigot, Walker speaks of an elongated 

 black spot on the front of the thorax in haUlis, which seems only 

 another way of describing Bigot's species bicolor — '' longitudinal 

 band from anterior to middle of disc " ; this black mark, Osten 

 Sacken announces to be variable. 



Should my surmise be correct, the wing marks would be the 

 best means of separating the species, as follows : — 



Wings with darker cloud around stigma 

 extending towards tip. Stigma fer- 

 ruginous brown, b Abdomen uni- 

 colorous tawny : in 9 centre of abdo- 

 men blackish . . . . habilis Wlk. 



