( 133 ) 



alis posticis nigro-bruaaeis absque colore fiilva; aaticis siibtns area apicali iiigro- 

 brannea bene expressa. 



Long. al. ant. 48 — 50 mm. 



2 (J (J from the Malay Peninsula (Malay States), ^y/ie, received from Messrs. 

 Staudinger and Bang-Haas, 1 S from Bau Presidency, Sarawak, collected by 

 H. S. Young, in whose honour we name the interesting species, and 1 ? from 

 Batang Proepoe, Padang Boveulanden, West Sumatra ; in Mns. Tring. 



cJ. The forewing agrees in shape more with that of M. spectahiUs than with 

 the forewing of M. di/ras, being obvionsly narrower than in the latter, with a longer 

 and more oblique distal margin ; the ground-colour is a more uniform and darker 

 wood-brown, while the lines are the same as in clyras. The hindwing is blackish 

 burnt-umber- colour, with the costal area and a large anal patch pale wood-brown, 

 the tawny tone of (Jiji-as being entirely absent. 



On the underside each wing bears two prominent lines, while the other lines 

 are faint; the apical area of the forewing and the anal patch of the hindwing are 

 dark burnt-umber-colour, as is also the underside of the palpi. 



FlQ. 6. — Maruniba juveiicus. 



As regards stractuTe,- juvencus 6 differs from di/i-as chiefly in the antenna and 

 genitalia. The former are decidedly shorter and especially thinner. The aual 

 tergite is longer than in di/ras, and narrower in its apical two-thirds, the apex 

 of the two lobes, however, being round as in di/ras. The anal sternite is elongate- 

 triangular, with the tip rounded off. The dorsal margin of the clasper (text-fig. 6) 

 terminates in a dagger-like process (S-), which projects into the concavity of the 

 inner surface of the broad apical lobe S'. The harpe (H) is long and curved 

 upwards, extending beyond the dorsal margin (of the denuded clasper). The double 

 process (P) situated above the penis-sheath is rough with small teeth. 



?. Body and wings somewhat more clayish in tone than the c?. The dorsal 

 line on thorax and al)domen as well marked as in the <J, and decidedly more 

 prominent than in di/ras. The underside of the wiugs much brighter than in 

 the c?, the apical area of the forewing and the anal marginal patch of the hindwing 

 as large as in the S, but like the underside of the palpi rather brighter brown, the 

 anal patch being wider than in di/ras. 



The genital armature almost exactly as in M. di/ras javanica Butl. (1875), 

 cf. R. & J., Uetis. of ^S/ihingidae, j). 2T0. tab. 18. f. 18 (1903). 



