Materials, Their Taxonomy and Natural History 35 



(b) The location at San Marcos (Vera Cruz, Mexico) is also on the Coastal 

 Plain, at an altitude of 600 feet, in a wide, poorly drained plain, with a short, 

 compact growth of grasses and a well-developed tree-island forest. The 

 climatology is about the same as at Tierra Blanca. All material has been 

 gathered on the edge of a tree island 0.5 kilometer SSW. of the railroad station. 

 Stocks were obtained as follows: No. 710 in May 1904; Xo. 711 in July 1905; 

 No. 714 in June 1907; No. 715 in June 1908; No. 716 in June 1909. 



(c) The Coatzacoalcos (Vera Cruz, Mexico) location is 2 kilometers north- 

 east of the town, at the edge of the sand-dunes. It is also a savannah, but modi- 

 fied by the approaching dunes and high humidity brought in from the Gulf of 

 Mexico by the onshore winds. The climatology is modeled on the same plan as 

 at the other two sources of material. Stocks were obtained as follows : No. 720 

 in May 1904; No. 721 in August 1904; No. 722 in January 1908; No. 723 in 

 August 1908. 



Materials from all three localities were, as far as analyses could discover, 

 identical, and not one has thus far shown any gametic characteristics that were 

 strictly limited to any one locality. 



Saltation: L. abrupta nov. var. 



Leptinotarsa angustovitta Jacoby. Tower, 1906, p. 6, pi. 16, fig. 2, where It 

 is recorded as angustovittata Jacoby. 



Imago : Exactly like undecimlineata in all respects except that elytral stripes 

 are suppressed or wanting and greenish metallic iridescence gives elytra greenish 

 tinge, or greenish white. In breeding it proves to be a recessive— ^i. e., absence 

 of stripes is recessive — and breeds true in cultures as an extracted recessive 

 when crossed. It is a rare sport accompanying certain strong climatic 

 influences. 



Occurrence. 



In nature, Tierra Blanca, 1904, 1907, 1910. Produced in experiment, 

 Chicago, 1905. 



Juvenile Stages. 



Like L. undecimlineata; food and habits also identical. 



Jacoby's doubt as to the standing and relationship of L. angustovittata led 

 me to believe in 1906 that ahrupta was the same or essentially the same form. 

 I have since 1906 found L. angustovittata in nature, reared it, and its affinities 

 are clearly with diversa and not with imdecimlineata Stal. 



LEPTINOTARSA DIVERSA N. SP. 



Leptinotarsa undecimlineata Stkl. Material from Orizaba, Oaxaca (Jacoby, 

 1883); Orizaba, Jalapa, Oaxaca, Mitla, Tlacolula, Tomellin (Tower, 

 1906), are references to L. diversa n. sp. and not to L. undecimlineata 

 Stai. Duges, 1883, Ann. de la Soc. Ent. de Belg., T. 28, pp. 1-6, pi. 1, 

 life-history from Guanajuato, are of forms here designated diversa. 



Descriptiox. 



Imago (plate 1, fig. 9 ; plate 2, fig. 4) . — Above : Head, pronotum, ivory white, 

 more or less tinged with yellowish : pattern of black spots. Elytra, ivory white, 

 often greenish, with 5 dense black longitudinal stripes ; costal edge inflexed, 

 black, punctate. Below: Mouthparts and eyes, dense shiny black, x^ntennae: 



