hs) 
House-F lies. 
BY J. F. ILLINGWORTH. 
(Presented at the meeting of November 2, 1922. 
Attempting to straighten out the terminology of our Muscoid 
flies, particularly those records of specimens not recognized in 
collections here, some interesting observations have come to my 
notice. Apparently the common house-fly, Musca domestica 
Linn. of Europe, North America, etc., does not occur here, at 
least not in its typical form. Collecting thousands of flies, dur- 
ing the past decade, has failed to disclose a single specimen. 
I have on exhibition typical domestica from San Francisco 
and Mojave Desert, Cal.; Ithaca, N. Y.; and Sydney, Australia. 
It is to be noted that, in comparison with these, where the eyes 
of the males are well separated, most of the Hawaiian speci- 
mens have the eyes, in that sex, almost contiguous, with some 
variations. 
There is a record of Musca favinervis Thomson in the Fauna 
Hawaiiensis, which has troubled me, since no specimens have 
been recognized in collections here. During the voyage of the 
Proc. Haw. Ent. Soc., V, No. 2, September, 1923. 

PL AYUE, LXe. 
Face View oF MALE HOUSE-FLIEs. 
(Semi-diagrammatic, Camera Lucida sketches. ) 
EXorTIcs. 
Fig. 1. Typical Musca domestica Linn., from Mojave Desert, Cal., 1916, 
Illingworth collector. 
Fig. 2. Typical Musca flavinervis Thomson, from Cape Town, South Africa, 
Bridwell collector. 
HAWAIIAN VARIETIES. 
Fig. 3. Nearest approach to Musca domestica of all the flies taken. Oahu, 
January 2, 1914, Illingworth collector. 
Fig. 4. Nearest approach to Musca flavinervis of all the flies taken. 
Puna, Hawaii, March 13, 1922, Swezey collector. 
Fig. 5. An intermediate form which is representative of the Hawaiian 
house-flies. University of Hawaii Farm, October 17, 1922. 
Illingworth collector. 
