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304
Journal of the Lepidopterists' Society
Amphimoea R. & J. A. walkeri Bdv. (= staudingeri Drc, magnificus Rothsch.)
Amphimoea is a monotypic genus and the species A. walkeri, according to Druce (in Godman & Salvin, 1886, Biologia Centrali-American a, Insecta, Lepidoptera Heterocera 2: 311; 3: pi. 65-4) and Draudt (in Seitz, Gross-Schmetterlinge der Erde, VI, Heter. Amer.: 847, 865), is distributed from Chontales, Nicaragua, Chiriqui Volcano, Panama to south of Brasil. These authors mention that the caterpillar feeds on a Jatropha species.
One female specimen from Dos Amates, Catemaco, Veracruz, taken in August 1965, is in the De la Maza collection. In Hoffmann's catalogue, this genus must be situated before Manduca Hbn.
Cressonia Grt. & Rob. C. juglandis (J. E. Smith) (Sphinx juglandis J. E. Smith)
This genus of Palearctic origin, previously known only from the United States, is recorded now for the first time in Mexico. According to Hodges (op. cit.), "the larvae feed on various species of hickory (Carya species) and walnut or butternut (Juglans species), and perhaps beech (Fagus species)."
The following specimens are in the De la Maza collection: one male from Parque Funeral Guadalupe, Monterrey, Nuevo Leon, 17 June 1970; one male and one female from El Barrial, Monterrey, Nuevo Leon, 10 September 1971. In Hoffmann's catalogue, this genus must be situated after Paonias Hbn.
Carlos R. Beutelspacher B., Instituto de Biologia, Apdo. Postal 70-233, Mexico 20, D.F. Mexico, & Roberto de la Maza, Jr., Nicolas San Juan 1707, Mexico 12, D.F. Mexico.
APODEMIA MORMO NEAR DIALEUCA (RIODINIDAE) FROM MONTANE SOUTHERN CALIFORNIA: NEW FOR U.S.A.
Eleven male and 23 female unusual-appearing Apodemia mormo (Felder and Felder) were taken on 3 and 5 June 1966 by John Justice, Keith Hughes and the writer on Sugarloaf Ridge, north of Barton Flats, San Bernardino Mountains and County, California. They were closely associated with the prostrate buckwheat, Eriogonum wrightii subscaposum Wats. (Polygonaceae), growing on gravelly slopes above 2600 m elevation in open mixed deciduous-coniferous forest dominated by ponderosa pine, mountain mahogany and manzanita. The entire series was shown to Dr. Jerry Powell, who found them nearly identical to A. m. dialeuca Opler & Powell, described from similar habitats in the Sierra San Pedro Martir of Baja California, Mexico, nearly 500 km south of Barton Flats (Opler & Powell 1961, J. Lepid. Soc. 15: 145-171; Patterson & Powell 1959, J. Lepid. Soc. 13: 229-235). The wings dorsally have large white spots on a dark gray background with little if any red or orange suffusion, lending a distinctly tesselated appearance to the insect; the ventral surfaces are dusted generously with light gray scales, especially on the outer one-third of the primaries and outer two-thirds of the secondaries (Fig. 1).
Subsequently other collectors have taken examples of this phenotype at the same and nearby localities, including some in September and early October suggesting multivoltinism (Opler, in lift). It is rather peculiar that this interesting population remained undiscovered until recent years. The fact that collectors like the Sperrys, Rindge, Comstock, Martin and others failed to turn it up in many years of intensive collecting during the last half-century causes one to wonder if it might be a very recent segregate from A. m. virgulti Behr populations to the south and west, or from A. m. near mormo and "blend-zone" populations to the east, north and northwest at lower elevations. The nearly exact similarity in facies, habitat and probable host-plant of this new population and topotypical dialeuca suggests either a common phenotypic response to similar environmental conditions, or previous ecologic and
Volume 27, Number 4
305
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