By Richard J. Adams, Timothy D. Manolis
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Extra resources for Field Guide to the Spiders of California and the Pacific Coast States
Inside the collar the silk is quite loose and, if disturbed, will collapse on itself, obscuring the spider hidden within. Apomastus are generally deep mahogany brown with unmarked abdomens. Among Pacific coast euctenizids, a uniformly dark coloration, a recurved thoracic groove, and a lack of cymbial spines are diagnostic of Apomastus males. Females are similarly colored and have straight, transverse thoracic grooves, unlike the procurved grooves of Aptostichus females. A more detailed exploration of the morphology and systematics of Apomastus can be found in Bond (2004).
Longitarsis. What makes this situation especially interesting is that the traits that define C. theveneti are present on the immature male C. longitarsis. This presents the possibility that there is only a single dimorphic species in which some males reach sexual maturity while simultaneously preserving an array of juvenile features. C. longitarsis demonstrates some degree of color variation, with individuals from the coast tending to be more silvery gray, and those in the Sierra, browner. C. longitarsis is widespread along the California coast from Monterey County to southern Humboldt County.
When you look for spiders at night, using a powerful headlamp will keep your hands free. ” This can be made by putting a small bit of cornstarch in the bulb of a turkey baster. When the bulb is squeezed, a puff of cornstarch will settle on any nearby webs, revealing their structure in intricate detail. Another trick is to put cornstarch inside an old sock (which in turn should be carried in a sealed plastic bag). When the sock is lightly beaten over a web, a mist of cornstarch falls onto it, highlighting its otherwise invisible architecture.