64 The Mechanism of Evolution in Leptinotaesa 



breeds true ; color is often almost a scarlet in freshly emerged specimens, but 

 changes to full red at maturity. 



Size : As in L. decemlmeata. 



Sexes: As in L. decemlineata. 



Occurrence: In nature: Stock from McPherson, Kansas, 1903, gave in 

 1904 at Chicago 1 male able to transmit character. Liberal, Kansas, 1905, 

 1 male, 2 females, breed true. 



Food: As in L. decemlineata. 



Juvenile stages: As in L. decemlineata. 



LePTINOTARSA TOBTUOSA NOV. VAB. 

 (Plate 6, fig. 3.) 



Imago: In form, color, sculpture, and pattern, except elytral pattern, like 

 L. decemlineata; elytral pattern, anal edge black, five longitudinal black stripes 

 fused into a variable network of many transverse fusions. Median stripe 

 shortened, much so posteriorly, not reaching more than two-thirds length of 

 elytron, bent anteriorly at region of middle band and unites with ramous stripe 

 which is bent posteriorly and fuses with inner subcostal stripe distally; sub- 

 costal approximated and much anteriorly, and other subcostal bent at middle 

 base sharply forward to meet costal stripe which is shortened and often not 

 well developed ; punctations much reduced and consist of a single irregular 

 row along edge of each stripe ; interspaces flat, polished, smooth. 



Size: As in L. decemlineata. 



Sexes: As in L. decemlineata. 



Food: As in L. decemlineata. 



Juvenile stages: As in L. decemlineata. 



LePTINOTARSA ALBIDA NOV. V.VR. 

 (Plate 6, fig. 6.) 



Imago: Elliptical, elongate, convex, smaller than L. pallida, white with 

 light-brown pattern. Above: head, pronotum, and elytra white, with color- 

 center present, greatly reduced, and all light brown in color; elytral stripes 

 shortened and narrowed, punctations on head and pronotum about like those of 

 L. pallida; antennae, sixth to eleventh joint broader than long, terminal joint 

 short, rounded, almost hidden ; elytral pmictations, single irregular row. Below, 

 like pallida. 



Size: Smaller than decemlineata. Male, 7 to 10.5 mm. long, 4 to 6.5 mm. 

 broad; female, 7 to 11.25 mm. long, 4 to 7 mm. broad. 



Sexes: As in L. decemlineata. 



Occurrence: San Antonio, Texas, 1904, 1, tested, breeds true — i. e., was able 

 to transmit its characters in toto. 



Food: As in L. decemlineata. 



Juvenile stages: As in L. decemlineata, only smaller larvte and body-color 

 pale red or pink. 



Leptinotaesa minuta nov. var. 



Imago: Body-form, proportion, color-pattern, and sculpture like L. decem- 

 lineata, excepting that L. minuta is always less than half the average size and 

 frequently only one-third that of L. decemlineata. (Plate 6, fig. 8.) 



Size: Body index, male, 5 to 9.5 mm. long, 4 to 5.25 mm. broad ; female, 5 to 

 10.25 mm. long, 4.5 to 6 mm. broad. 



Sexes: As in L. decemlineata. 



