142 UNITED STATES NATIONAL MUSEUM BULLETIN 2 76 



nearly perfect condition. Data: Calif., 101. No. 8774, Collection Hy. 

 Edwards. Neotype, Malacosoma californicum (Packard), male, F. W. 

 Stehr 1963. Genitalia in microvial labeled: Neotype, Malacosoma 

 californicum (Packard), male genitalia, F. W. Stehr 1963. See Appendix 

 II for a complete discussion of this designation (page 283). 



DISTRIBUTION (figs. 3, 6).— Restricted to the immediate area 

 around San Francisco Bay; extending south on the San Francisco 

 Peninsula until it intergrades with M. californicum ambisimile near Los 

 Altos; extending south on the east side of the Bay to just east of San 

 Jose; extending east to Oakley, and extending a variable distance 

 north of San Pablo Bay where it intergrades with M. californicum. See 

 M. californicum ambisi?nile for a discussion of the relationships between 

 M. californicum californicum and M. californicum ambisimile (page 145). 



COMMENTS. — This subspecies is probably the least distinctive of 

 those recognized in this revision, and it should be restricted to the 

 populations around San Francisco Bay in which most of the larvae 

 are nearly black with either a small amount or no addorsal orange, 

 which rarely have any middorsal markings, which have one or two 

 (or rarely no) small blue-white subdorsal spots, and in which both 

 the primary and secondary setae are orange (figs. 352-353). Populations 

 north of the Bay which do not meet these requirements should be 

 referred to as Malacosoma californicum (Packard). (They can be called 

 tlie Mendocino-Trinity populations of M. californicum to distinguish 

 them from other populations.) 



Specimens Examined. — 530 (Museum specimens — 87 males, 62 females, 23 

 larvae; reared specimens — 180 males, 178 females, plus numerous larvae and 

 egg masses). See Appendix I for data on collections made during this study, 

 and for data on collections of intermediates between M. californicum californicum 

 and M. californicum ambisimile (page 270). 



California. — ^Alameda; Alameda Co.; Albany Hill (Alameda Co.); Alum 

 Rock Park (Santa Clara Co.); Antioch; Berkeley; Strawberry Canyon, Berke- 

 ley Hills; Colma; Concord; Contra Costa Co.; Fairfax; Lafayette; MUl Valley; 

 Mission San Jose (Alameda Co.); Mountain View; Napa; Novate; Palo Alto; 

 Petal uma; San Francisco; San Leandro; Walnut Creek. 



Intermediate Popxjlations. — Intermediates between M. californicum cali- 

 fornicum and M. californicum ambisimile: Mountain View; Tunitas Canyon, 6 mi. 

 S. Half Moon Bay. Also see Appendix I (page 270). 



Malacosoma californicum ambisimile (Dyar), new status 



Clisiocampa ambisimilis Dyar, 1893, pp. 40-41. — Neumoegen and Dyar, 1894, 



pp. 156-157. 

 Variety of C. calif ornica Packard, Packard, 1893, pp. 181-182. 



