( ii ) 



Grav., and Qnedius longicornis, Kr., the latter taken from 

 moss on a stump in the Avood at the foot of Snowdon, close 

 to the Llanberis Falls. There appears to be no previous 

 record of this species occurring in Wales. 



The Rev. F. D. Morice exhibited a series of lantern slides 

 illustrating the structure of concealed ventral segments in 

 males of the Hymenopterous genus Colletes. 



Mr. W. J. Kaye exhibited a Mullerian association of black 

 and transparent species from the Potaro Road, British Guiana, 

 consisting of Ithomiimx, Ithoviia zarej)ha, Ithomia Jlorula, 

 Heterosais sylpliis, and Nwpeogenes n. sp, ; Erycinidae, Stalachtis 

 phxdusa, and Stalachtis evelina ; Hypsidx, Lauron jxirtita ; 

 Geometridiv, Hyrmina, n. sp. The whole of the specimens had 

 been caught on one single forest road, some 1 70 miles inland. 

 Mr. Kaye called particular attention to the new species of 

 Ncqyeogenes , and said it was a most remarkable divergence 

 from the usual coloration of the genus Napeogenes as a 

 whole, where brown, yellow and black were the prevailing 

 colours, while the present insect was black and transparent 

 only, and conformed in a wonderful way with many true 

 members of the genus Ithomia. Attention was further drawn 

 to the fact that typically coloured Kapeogenes, N'. inachia and 

 N. ijihianassa, occurred not uncommonly on the same ground 

 and fell into another group of similarly coloured species. It 

 was thus not a little remarkable that, Avith these two different 

 forces acting, such a complete transference could have 

 been effected on the present undescribed species, and it went 

 to show what a powerful influence these black and trans- 

 parent species exert even in the presence of counteracting 

 forces. 



The President exhibited a male and female of PapiUo 

 dardanus, captured in coitu by Mr. Geo. F. Leigh, at 

 Dux'ban in 1902, and examples of the offspring reared from 

 the eggs laid by the female. The latter Avas of the cenea 

 form, as Avere the great majority of the female offspring; 

 three, hoAvever, Avere of the black and Avhite liippocoon form. 

 More recently, in 1903, Mr, Leigh had captured a female of 

 the rare trophonius form, and had bred from the seven eggs 

 laid by it five butterflies, of AA-hich the tAvo females Avere both 



