368 
Scenopinus in Hawaii (Diptera). 
IB Yee: Ele eDIROYPAUNIES slik. 
(Presented at the meeting of November 1, 1923.) 
It has been known for some time that there were two 
introduced species of Scenopinus in Hawaii. One has in- 
fuscated wings, black halteres, and dark legs with yellow tarsi; 
and the other, nearly clear wings, reddish-brown legs, and the 
halteres with conspicuous white knobs. 
Grimshaw (Fauna Hawaiiensis, Vol. III, p. 11, 1901), 
records Scenopinus niger “Mg.” (which should be “(De 
Geer)”) as collected in “Hotel, Honolulu.” Just recently I 
found a reference by Brunetti (Fauna British India, Diptera 
Brachycera I, p. 312, 1920) that Scenopinus fenestralis (Linn.) 
occurred in Hawaii. 
Lundbeck (Diptera Danica, pt. 2, p. 159, 1908) gives de- 
scriptions and a key separating these species and I find that 
our specimens fit these two species very nicely. They may be 
separated by the following key: 
Wings strongly infusecated; eyes separated in both sexes; legs blackish, 
tarsinyellows: Shalteres! ad arkeen ae eee ee erie ae S. niger (De Geer). 
Wings not strongly infuseated; eyes of male contiguous; legs ferrugine- 
ous; halteres with white knobs................ S. fenestralis (Linn.). 
These flies may be easily recognized. They are jet black, 
with a flattened abdomen, the seven segments of which bear 
transverse depressions. They are quite bare of bristles, even 
the arista.of the small, three-jointed antennae being lacking. 
They are most frequently. seen on windows, but are also occa- 
sionally found elsewhere, as on Ewa Coral Plain. The larvae 
are elongate, cylindrical, of about twenty segments. They 
are thought to be carnivorous, living upon the larvae of small 
moths, fleas, etc. They are associated with certain groups of 
plants, as the Umbelliferae, and on Syringa, Rosa and 
Carpinus. 

Proc. Haw. Ent. Soc., V, No. 3, December, 1924. 
