170 Dr. H. Eltringham's Further Observations on the 



are no intermediate or blind glands. The portion of the 

 patch from which the drawing is made represents its 

 maximum thickness. A considerable area is not any 

 thicker than the rest of the wing, the upper and lower 

 membranes being in close juxtaposition, and the glands 

 so reduced as to occupy merely the interior of the scent-cup 

 projecting from the upper-wing surface. The brush is of 

 simple structure containing but one kind of hair. PL XV, 

 fig. 1, is a reproduction from a photograph of a section 

 of the brush near the base of the bag, showing that the 

 sections of the outer hairs are not circular but irregular in 

 outline. Fig. 2 represents a section taken at about the 

 middle of the brush, and fig. 3 one near the end. In the 

 latter it will be observed that the hairs have rather obscured 

 outlines, due to the fact that they produce a certain amount 

 of dust material by the breaking oft' from their surface of 

 small projections. PI. XIX, fig. 18, shows a longitudinal 

 view of a portion of one of the hairs bearing small leaf- 

 like projections which readily break off, and thus form 

 detached particles. The dust produced is of very small 

 volume. 



Trepsichrois mulciber, Hubn.* 



The scent-organs in this species consists of a pair of 

 abdominal brushes and perhaps a large patch of special 

 scales near the costa of the hind-wing, though in the case 

 of the latter there is some reason to suppose that, if it 

 has to do with the scent-apparatus at all, the function is 

 mechanical. As compared with the brushes in the species 

 already described, those of T. mulciber differ in their distinct 

 connection with the actual seat of production of the scent. 

 The brush-bag differs from that of the only other related 

 species which I have been able to examine, in being pro- 

 vided with a peculiar accessory vessel at its base, though 

 I would at once state that I have unfortunately had only 

 a single example from which to make preparations, and the 

 possibility, however remote, must be borne in mind that 

 this structure may have been an abnormality. When 

 dissecting out the brushes this accessory vessel became 

 visible to the eye and appeared as a small vesicle attached 

 to the proximal end. PI. XVI, fig. 4, represents a photo- 

 graph of a longitudinal section passing through the vesicle ; 

 fig. 5 a transverse section at the point where the vesicle 



* Better known as Ewploea midamus. 



