( X ) 



separates a row of three subapical spots from a more centrally 

 placed row of four spots, of which the lowest and outermost 

 approaches the mai-giii, reaching the position of the fourth 

 submarginal spot of Eutresis. In some individuals this outer- 

 most spot also exhibits faint traces of increased yellowness 

 and opacity at its outer and lower extremity. 



The fifth and sixth submarginal spots of the fore-wing of 

 Eutresis imitotri.r, the allied form, and E. hyspa, as regards 

 their black internal contours, i-esemble Ihma ilione more 

 closely, as regards their ti'ansparency. — /. phenarete. 



The black transverse bar which descends from the costa of 

 the fore-wing and crosses the cell, forms nearly a right angle 

 with the costa in Methona coufusa, while in the transparent 

 Ecuador form ]^samathe, Codm. and Salv., it is sometimes 

 rather less than a right angle on the basal side, rather more 

 on the distal. In Thyrid'm ])sidii the bar is always obliquely 

 directed, forming an acute angle with the costa on the distal 

 side. In Ituna i^henarete and Eutresis imitatrix it is still more 

 oblique and the distal angle even more acute. Of more import- 

 ance is the direction of the bar, which is almost straight in 

 the Methona and the Thyridia, but turns inwards at or some- 

 times below the point at which the first median nervule leaves 

 the median nervure, in /. phenarete and E. imitatrix. The 

 elbow is rendered prominent by an extension of the black 

 marking on the convexity of the bend. As regards this 

 feature /. ilione has apparently been drawn towaids the 

 primary Ithomiine models ; for the elbow is far less marked 

 than in phenarete. 



Furthermore, in both species of Ituna and in Eutresis 

 imitatriy, a small triangular portion is cut oft' by the median 

 nervure from the outer and lower part of the basal ti'ansparent 

 area. In Methona confma, on the other hand, the broad black 

 inner margin reaches the median nervure, and obliterates this 

 part of the ba.sal area. In Th>iridia psidii a more or less 

 distinct trace of transparency nearly always persists in this 

 region below the nervure, although the condition of Ituna and 

 Eutresis is apparently never equalled. 



As regards the two primary models it is evident that in 

 this last-mentioned feature the Methona has been mimicked 



