* Discusses and identifies greater than one hundred thirty species
* Species bills comprise info on making a choice on butterflies via habit, markings, and host plants
* appealing full-color plates illustrate most sensible and backside perspectives of wings for simpler identification
* contains a species record and a glossary
Preview of Field Guide to Butterflies of the San Francisco Bay and Sacramento Valley Regions (California Natural History Guides) PDF
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Extra resources for Field Guide to Butterflies of the San Francisco Bay and Sacramento Valley Regions (California Natural History Guides)
This species, like many hairstreaks, has a really strict day-by-day regimen. those butterﬂies nectar from approximately 10:30 A. M. to 2:00 P. M. ; in our zone they specially stopover at California buckeye (Aesculus californica), milkweeds (Asclepias), dogbanes (Apocynum), yerba santas (Eriodictyon), horehound (Marrubium vulgare), and coﬀeeberries (Rhamnus). men perch on or close to the host and are territorial in overdue afternoon, mostly peaking round 4:00 to 4:30 P. M. word that i don't specify any early-morning activity—we don’t recognize the place they're then! DISTRIBUTION: approximately all counties, yet now very infrequent and native within the southern Sacramento Valley. HOST crops: Oaks (Quercus); in chaparral occasionally on wildlilacs (Ceanothus); at the east slope of the Sierra and maybe in areas within the Coast levels, on mountain-mahoganies (Cercocarpus). The Sacramento Valley ecotype feeds on valley oak (Q. lobata) in wealthy bottomlands. SEASONS: One ﬂight, April to July, lasting three to five weeks in any given position. Overwinters as egg; larva feeds on gentle foliage almost immediately after bud burst. This seasonality is attribute of feeders on tannin-rich crops, which develop into much less and no more safe to eat because the season is going on. comparable SPECIES: The Sylvan Hairstreak (S. sylvinum) and Tailless Sylvan Hairstreak (S. dryope) have primarily an identical colour and development yet are washed-out in visual appeal, the black dots less than frequently vague (sometimes obsolescent); the floor colour under, as within the California Hairstreak, varies from dull/ashen to really lustrous. The lunules on the base of the tails (or, within the Tailless Sylvan, the place the tails will be) under are much less good deﬁned than within the California Hairstreak; usually just one has any pink, and the massive blue spot has very little purple above it. either the Sylvan and the Tailless Sylvan Hairstreaks are strict riparian experts, linked to willows (Salix)— now not oaks. the typical Hairstreak (Strymon melinus) has ventral development of strains, no longer dots, a hundred thirty SPECIES bills and very trendy pink eyespot at the hindwing above and under. The male’s stomach is orange above. SYLVAN HAIRSTREAK or WILLOW HAIRSTREAK TAILLESS SYLVAN HAIRSTREAK or WILLOW HAIRSTREAK or DRYOPE Satyrium sylvinum Satyrium dryope Pl. eleven the genuine courting among those entities is doubtful. Are they species, subspecies, or...? they're very related aside from the absence of tails within the Tailless Sylvan Hairstreak. Statistically, the Tailless Sylvan has a tendency to be paler, ash grey underneath with muchreduced or perhaps obsolescent black spots. ladies tend to be strongly orange washed above. The Sylvan Hairstreak has a tendency to be extra lustrous underneath, with extra specified spots; the ladies are very variable. the matter is that a few tailed populations, specifically within the Sacramento Valley, glance very similar to the tailless differently. Tailed populations ensue in cooler and moister habitats, whereas tailless ones are in warmer and drier habitats. The Tailless Sylvan predominates in Santa Clara County, the Livermore Valley, and alongside the jap fringe of the Coast diversity south of the Delta.