200 
Hippoboscidae (Diptera Pupipara) 
both in the Stanford University collection; one male from Cyanocitta stelleri , 
Upper Alsea River Valley, Oregon, in the collection of the junior author. This 
last specimen has previously been recorded by Cole (ref. cited) as 0. anchineuria 
Speiser. 
Notes. There have been numerous descriptions of this species but only 
that given by Massonat (ref. cited) is sufficiently precise and accompanied 
by such figures as to make identification definitely possible. Our specimens 
agree very closely with the figures given by this author, but as there are 
certain chaetotactic details which he has not included we are figuring it 
again. 
Some of the chaetotactic characters are possibly generic and some are 
undoubtedly specific. There appears to be some slight variation in the size 
and arrangement of the bristles. The abdomen is densely beset with small 
setae (Fig. 15) and bears numerous large setae, the position of which is 
apparently constant. In addition to the basal plate there are on the dorsum 
Fig. 16. Ornithomyia avicularia (L.): A, wing; B, portion of anterior tarsus. 
three small median plates (the anterior-most of which is partially concealed 
beneath the basal plate in the figure) and a pair of larger plates near the 
apex. 
The figure of the abdomen of the female given by Massonat indicates that 
the apex of the abdomen is quite deeply bilobed, while in our specimens there 
is a median lobe. This lobe, however, is membranous and is probably more or 
less retractile, and we are not inclined to regard this difference as important. 
The abdomen of the male differs from that of the female chiefly in not being 
lobed at the apex and in having a complete, transverse, pre-apical plate instead 
of the paired plates of the female. The genitalia show no external processes; 
the internal structures consist of a pair of slender, pointed, lateral processes 
and a pointed median process. 
The wing venation is characteristic, R 1 (first vein) ending considerably 
before the radio-medial (first) cross-vein. The fine setulae are confined to a 
definite area as indicated in the figure. The costa is covered with short, bristly 
setae, especially dense beyond the end of B x . 
