( xliv ) 



in Parana, at close on 3,000 feet elevation. In this case also 

 none of the species were found in abundance, the actual num- 

 bers being P. adasa 3, P. sylvo 1, //. andania 6. On ]\larch 

 11-12 all three species were secured in the same locality, and 

 the Hymenitis continued to occur singly till the latter part of 

 the month. Both the Pseudoscada and the Pteronymia are, how- 

 ever, frequently to be found in abundance, while the Hymenitis 

 appears to be always decidedly less common. Mr. Kaye re- 

 marked that these groups of black and transparent Ithomiine 

 species were always found in rather dark forest country, and 

 it was possible that they were simply cases of syncryptic 

 resemblance, rather than mimetic examples of a Mullerian 

 Association, for these species were invisible at a very short 

 distance, and they were all equally adapted to that end. A 

 third small group that was exhibited consisted of a Danaine, 

 Ituna ilione, and two Ithomiines, Thyridia {Methona) themisto * 

 and Dircenna dero. All these were also from Castro. The 

 D. dero was by far the commonest, but getting worn, while 

 P. themisto, of which five were taken, was very fresh. Only 

 two of the Danaine, /. ilione, were secured. The insects of 

 this group were found on the mai'gins of woods amongst 

 rough scrub; and the causes of the resemblances were pro- 

 bably of a different nature. Natural selection here doubt- 

 less was at work to make these insects conform to a uniform 

 pattern. While the small transparent Ithomiines were all 

 but invisible at a short distance, these insects were con- 

 spicuous even at a considerable distance. 



Professor E. B. Poulton, commenting on the exhibit, was 

 of opinion that the forest species as well as the others were 

 connected as members of a mimetic group. 



Dr. LoNGSTAFF, Speaking from personal experience, empha- 

 sised the invisibility of these Ithomiines on the wing, at a 

 very short distance, in their native haunts. 



New Mimacraeas. — Mr. Hamilton H. Druce exhibited 



(^ and $ of the new ]\Iimacraea eltrhighami, captured by Mr. 



S. A. Neave in the Bugoma Forest, Unyoro, Uganda, and 



* One Aprotopos {Thyridia) psidii, identical with the hiwer Amazonian 

 form, and not at all like the nsual S. Brazilian A. hippodainia { — pytho), 

 was taken at Itarari, in similar conntry to Castro, but about 120 miles 

 farther east, and 500 ft. lower elevation. 



