190 THE BLOWFLIES OF NortH AMERICA 
an optimum type of habitat for Protocalliphora avium, and it is 
possible that these birds are the usual hosts, while in nests of 
smaller, beneficial species, the parasites may be injurious and 
even fatal to nestling birds as reported in the literature. Cer- 
tainly, the magpie nestlings observed by us appear healthy and 
of good flesh, with only minute lacerations on the breast to 
indicate feeding by the generous infestations of maggots 
present.’’ 
The pupal parasites Muscidifurax raptor Girault and Sanders, 
Mormomella vitripennis (Walker), and Morodora armata Gahan 
have been reported as having been reared from aviwm, the latter 
species being originally described as supposedly from this host. 
Apaulina basingeri, new species 
The head and genitalia of the male of this species shows it to 
_be closely related to avium, from which it differs in having the 
front and parafaciale narrower. 
Male. Head height 10.6; length at antenna and at vibrissa 
7.2; eye height 7.8; front at narrowest 0.14 head width, 0.17 at 
vertex and 0.36 at lunule; head width 13.5; parafaciale opposite 
lunule and distance between vibrissae in the proportion 2.0:2.2; 
parafrontale and parafaciale black with dull gray pollen; basal 
segments of antenna orange; coloration and chaetotaxy as in 
avium. Genital segments with internal features (pl. 21, D) as 
illustrated. 
Female. Head height 10.0; length at antenna and at vibrissa 
7.0; eye height 7.5; front at narrowest (at vertex) 0.28 head 
width, 0.40 at lunule; head width 13.5; parafaciale opposite 
lunule and distance between vibrissae in the proportion 2.0:1.9; 
parafrontale and parafaciale either with dull silvery or brassy 
pollen. Otherwise similar to male except for normal sexual dif- 
ferences. 3 
Length. 7-9.5 mm. 
Type. Male, No. 54929, U. S. National Museum. 
Type locality. San Diego, Calif. 
The type series consists of the following specimens: Three 
males, including the holotype, June 28, 1917, San Diego, Calif. 
(J. M. Aldrich); four males, June 4, 1936, Temecula, Calif., 
two females, from nest of house finch, July 1936, Anaheim, 
Calif., one male, September 20, 1934, Corona, Calif., two males, 
May 18, 1934, Forest Home, Calif., and one female, May 4, 1934, 
Riverside, Calif. (A. J. Basinger) ; two males and three females, 
from nest of mourning dove, June 10, 1938, Le Grande, Calif. 
(J, A. Neff) ; one male, July 4, 1929, San Diego, Calif., one male, 
