﻿HYBRIDS OF THE GENUS OPORABIA. O 



(4) Elbowed line. 



(a) Male. Almost as direct, and forming as perfect a right as 



in autumnata. 

 {b) Female. More or less waved, and, as it bends, almost 



curving to the discal spot, as in dilutata. 



(5) Subterminal band. 



Male. Too confused to describe, but characters intermediate. 

 Female. Almost a solid block ; inwardly rounded, as in dilutata. 



(6) Discal point. 



Male. Sharp and clear ; not touched elbowed line ; almost 



as in autumnata. 

 Female. Confused ; generally united to elbowed line. 



(7) Terminal band of hind wings. 

 Male. A solid smoky block. 



Female. Somewhat similar, but scallops of dilutata quite 

 visible. 



(8) Both sexes have the white V at the junction of vein two with 



cell well-developed. This stands out very clearly in the 

 darker suffused female. 



(9) Genitalia. 



Male. Spine on valve developed, but small ; head of labides 

 intermediate. Cristae on justa eleven as in alticolaria 

 {autumnata vera has nineteen). Shape of valve irregular. 

 Costal ridge doubled. 



Female. Upper signum * of bursa copulatrix knobbed and 

 intermediate. Lower peg-shaped, as in dilutata. 



(10) In other characters where the species differ, i.e. shape, 



size, &c., the male is slightly nearer autumnata, and the 

 female more or less intermediate. 



II. — OpORABIA hybrid RUNGEI = 0. AUTUMNATA ^ X 0. DILUTATA ? . 



In the case of this cross, moths of the same parentage as 

 those used for the reciprocal cross were employed. The product, 

 however, is totally different. Except that the white V so 

 prominent in robsoni is absent, the two sexes would pass for 

 suffused autumnata with more or less confused markings, this 

 suffusion being somewhat weak, and the result of the melanism 

 inherited from the female parent. In both sexes there is a 

 general out-of-focus effect, giving the impression that we have 

 here a blurring due to a failure in securing the exact super- 

 imposition of two images, such as one often sees in colour 

 printing. 



The genitalia in both sexes show the same tendencies as in 

 robsoni, but the divergence from autumnata is not so great. 



■■'■ Pierce (' Genitalia of the Georn.,' p. 41) is wrong in saying that the 

 signa are discoid. In both dilutata and autumnata the upper one is 

 knobbed, scobinate ; ii? autumnata the lower is discoid, and in dilutata 

 peg-shaped. 



