292 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iii 



Hololena curta McCook, mature 9 , collected at Glendale. Parasite ( 9 ) 

 emerged from host May 17, 1949, pupated May 19, emerged as adult May 24, 

 and died June 2, 1949. 



Hololena cxiria McCook (?), immature, collected at Glendale. Parasite (9) 

 emerged from host May 25, 1949, pupated May 26, emerged as adult June 2, 

 and died June 6, 1949. 



Hololena curia McCook (?), immature, collected at Glendale, Parasite (9) 

 emerged from host July 31, 1949, pupated Aug. 1, emerged as adult Aug. 6, and 

 died Aug. 11, 1949. 



Hololena curta McCook (?), immature, collected at Glendale. Parasite (9?), 

 pupated Jan. 21, 1950, started to emerge on January 27 but did not completely 

 emerge from the pupal skin. Even though it was not fully emerged, the fly 

 lived until Feb. 1, 1950, or five days. 



Hololena curta McCook (?), immature, collected at Fish Canyon, San Gabriel 

 Mts. Parasite (9) pupated Mar. 31, 1950, emerged as adult Apr. 6, and died 

 Apr. 12, 1950. 



Hololena curta McCook (?), immature, collected at Glendale. Parasite (cf) 

 emerged from host Apr. 4, 1950, pupated Apr. 7, emerged as adult Apr. 12, and 

 died Apr. 17, 1950. 



Herphyllus species, immature, collected at Glendale. Parasite (cT) first seen 

 as prepupa Apr. 8, 1950, pupated Apr. 10, emerged as adult Apr. 14, and died 

 Apr. 18, 1940 



Biology: Schlinger (1952) reported Hololena curta McCook as a 

 rather common host of the acrocerid Opsebius diligens Osten Sacken. 

 The records cited above for pallidipennis and unpublished records of 

 Acrocera melanderi Cole attacking the same host indicate con- 

 siderable competition for this host. All specimens of the host 

 Hololena curta collected at Glendale, Calif., were taken from the same 

 hillside within a 100 ft. sq. area, which would indicate that considerable 

 competition existed for this specific host between the parasites of at 

 least three genera of acrocerids. 



From the available biological information, it appears that pallidi- 

 pennis agrees in most respects with other Ogcodes species. Malloch 

 (1915, 1917) recorded and figured the pupal skin from Illinois. Gil- 

 lette (1924) reported a peculiar case of egg-laying in which the para- 

 site flew into a house in Colorado and deposited nearly 3,000 eggs in 

 about one hour on a small piece of cloth. Kaston (1937) has discussed 

 and figured the posthost developmental stages in Connecticut. 



As indicated from the new rearing data cited above, the average 

 periods of time involved in the various developmental stages were 

 as follows: Emergence from host to pupation was 1.8 (1-3) days; 

 pupal period was 6.5 (4-11) days; adult longevity under poor labora- 

 tory conditions was 6.5 (4-12) days. In nature, adults of pallidipennis 

 would no doubt live much longer, perhaps 20-30 days. 



Discussion: The accumulation of specimens from southwestern 

 United States, Mexico, and Costa Rica has increased the known dis- 



