302 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



(2) Hololcna species, immature, collected at Fish Canyon, Los Angeles Co. 

 Parasite ( 9 ) emerged from host May 16, 1949, pupated May 18, emerged as 

 adult May 24, and died May 29, 1949. 



(3) Pardosa sternalis Thorell (?), immature, collected at Bolinas, Marin Co. 

 Parasite (9), emerged from host Jan. 13, 1950, pupated Jan. 14, emerged as 

 adult Jan. 17, and died Jan. 20, 1950. 



(4) Pardosa sternalis Thorell (?), immature, collected at Bolinas. Parasite ( 9 ) 

 emerged from host Oct. 10, 1949, pupated Oct. 12, emerged as adult Oct. 16, and 

 died Oct. 20, 1949. 



(5) Pardosa sternalis Thorell (?) , immature, collected at Bolinas. Parasite ( 9 ) 

 emerged from host Jan. 17, 1950, pupated Jan. 19, emerged as adult Jan. 23, and 

 died Feb. 4, 1950. 



(6) Pardosa sternalis Thorell (?), immature, collected at Bolinas. Parasite ( 9 ) 

 emerged from host Oct. 10, 1949, pupated Oct. 12, emerged as adult Oct. 16, and 

 died Oct. 19, 1949. 



(7) Xysticus cunctator Thorell, immature, collected at Tapia Park, Los Angeles 

 Co. Parasite ( 9 ) emerged as adult June 12, 1954. 



(8) Xysticus cunctator Thorell, immature, collected at Tapia Park, Los Angeles 

 Co. Parasite (9) emerged from host May 1, 1954, pupated May 3, emerged as 

 adult May 5, 1954. 



(9) Philodromus species, immature, collected at Sunland, Los Angeles Co. 

 Parasite ( 9 ) emerged as adult May 5, 1955. 



(10-27) 9cf and 9 9 parasites were reared from spiders collected at Luther 

 Pass, El Dorado Co., July 24, 1955. The hosts for those that could be associated 

 were Pardosa species, all immature. The parasites were collected under pieces of 

 cow dung in a meadow either in the form of larvae, prepupae, or pupae. No 

 accurate dates of developmental stages were kept, but the dates of adult emer- 

 gence were from July 29 to Aug. 3, 1955. 



Biology: From the above rearing data it can be said that the 

 average posthost developmental periods were as follows: Emergence 

 from host to pupation, 1.8 (1-2) daj^s; pupal period, 3.8 (3-7) days; 

 longevity of the adults under laboratory conditions, 6.6 (3-12) days. 

 These few records compare well with those cited earlier for pallidi- 

 pennis; only the pupal period of the latter differed to any extent — 6.6 

 daj'S as compared to 3.8 days for adaptatus. 



The only published biological data which definitely can be associated 

 with adaptatus were those of Kessel (1948). He observed the mating 

 habits and was impressed by finding the flies rather gregarious, or at 

 least common around only certain of the many Juncus plants in the 

 area. Sabrosky (1948, p. 417) reported that some specimens had 

 been stored by a crabronid wasp in Arizona, but these specimens 

 actually represent the species described below as boharti, new species. 



It seems worth-while at this point to make a few notes on the 

 ecology of the tj'pe locality, and to describe the manner in which the 

 unusually large type series was collected. Sardine Creek, Calif., the 

 type locality, is a typical Sierran meadow at an elevation between 

 8,400 and 8,600 feet, just on the east side of Sonora Pass, and thus 

 east of the Sierra Divide. The meadow contains a fairly swift and 



