THE DETERMINATION OF DOMINANCE. 



313 



while L. oblongata has one. L. oblongata, as shown in Fig. 4, 

 is long and oval in outline; L. decemlineata, as shown in Fig. 4, 

 is more rounded; and L. multitcsniatd is robust in type. There 

 are also color differences between the species, which need not 

 concern us here. Three experiments will serve to illustrate 

 the purpose of this paper. 



F 



Fig. 4, Arranged to show some of the essential differences between the species: 

 L. oblongata, L. multitceniata and L. decemlineata. (A) Showing the form and 

 characteristic markings of the adult of L. oblongata. (B) Adult of L. muUitaniata, 

 showing the more robust form and somewhat different type of general color pattern, 

 sharply distinguishing it from both of the other species. The elytral ground color 

 is often dark ochre, sometimes even reddish. (C) The type of L. decemlineata 

 used in these experiments, somewhat intermediate between the two other species 

 in body form, and to a certain extent in markings. (D) Showing the side view of 

 a full grown larva, with its color pattern. The ground color is yellow and that ot 

 the adult somewhat variable. (£) Adult larva of L. multitceniata, with the char- 

 acteristic color pattern. Ground color is yellow as in L. oblongata, but darker. 

 (F) Shows the characteristic color pattern of L. decemlineata; the ground color of 

 the larvcc is wine red. 



L. decimlineata X L. oblongata X multitaniata. 

 Exp. No. C. H. 156.2 Balsas. 

 In 1905, twenty L. decemlineata, from pedigreed culture Ex. 

 No. 99, g. X from Chicago; twenty L. oblongata, from pedigreed 

 culture at Cuernavaca, and twenty L. multitceniata, derived from 



