118 Colonel C. Swinhoe on 



were pushed to extremes at the time of the formation of the 

 young segments (when presumably they are in a plastic 

 condition), and if at the same time the intersegmental divi- 

 sion were suppressed, the result would be a "double segment" 

 of the kind that has been described. It is difficult, of course, 

 to understand what force or forces may have been operating 

 to bring about such a condition, but it is suggested that some 

 such process may have been the cause of this malformation, 

 rather than that the specimen is a " double monster." 



Although a number of records are to be found in literature 

 of segments of T. saginata with two opposite or nearly 

 opposite genital pores, I have been unable to find an account 

 of a case similar to the present example, with two bilaterally 

 symmetrical sets of internal organs. A very curious case 

 has, however, been described and figured by Blanchard *, 

 where a single segment, in a chain otherwise consisting of 

 quite normal segments, contained a set of organs at each end, 

 both leading into a common uterus in the normal median 

 position. The ovary, yolk-gland and associated organs at 

 the posterior end of the segment were arranged in the usual 

 order, but those at the anterior end were reversed, so as to 

 form a " mirror-image " of the former. Each set had its own 

 ducts and pore, the pores being situated one on either side of 

 the segment, but not quite opposite to each other. Although 

 this has been referred to as a single segment, it ought perhaps 

 to be regarded as two segments, since there was a partial 

 transverse division on one side. 



XVII. — Indo- Malay an and Australian Noctuidae. 

 By Colonel C. Swinhoe, M.A., F.L.S., &c. 



Subfamily Sabrotbbipinm. 



Characoma perfecta, nov. 



S • Upperside : fore wing grey irrorated and suffused 

 with pale black, a deep black patch on middle of costa 

 angled downwards, narrowly extending on costa to near 

 apex, and also to the base of the wing, its inner edge with 

 a white patch irrorated with black and containing on its 

 lower part three black spots and another below near the 



* Bull. Sue. Zool. France, xv. 1890, p. 106. The writer is indebted 

 to Prof, A. Railliet for drawing bis attention to tbis case. 



