374 INSECTA. 
Two other subgenera are removed from the last of the division by. 
the pilose or plumous sete of their antenne. 
Dryomyza, Fall., Metg., 
Where the face is concave beneath the antennz, and terminates 
inferiorly, or at the oral cavity, by a short, truncated snout, as in Scato- 
phaga, and in most of the Dolichocera*. 
Sapromyza, Fall., Meiy., 
Where the face is straight. and does not project inferiorly f. 
The last of the Scatomyzides have the seta of the antenne simple { ; 
these organs are always very short, distant, and straight, with the last 
joint semi-ovoid or forming a short triangle obtuse at the end. These 
Inseets are very small, almost glabrous, black or cinereous, and more 
or less varied with yellow; the legs are strong and the eyes large. 
The summit of the head is flat and frequently presents, at its pos- 
terior extremity, a triangular brown space, on which are placed the 
ocelli. The two ordinary transverse nervures of the wings are 
approximated near the middle. These Diptera are found on flowers. 
Several of the larve attack the interior of different plants, and 
some of them are very injurious to the agriculturist, by destroying va- 
rious cerealia previous to their fructification. Those of one species— 
Musca. frit., L.—in Sweden sometimes destroy the tenth of the crop of 
barley, the total loss thereby occasioned being estimated at one hundred 
thousand golden ducats. The larve of some other species—the Os- 
cina pumilionis, and O. lineata, Fab.—are also highly noxious. For 
further details on those Insects which attack our cerealia, see the Me- 
moir of the late M. Olivier ¢. 
These Scatomyzides compose our genus 
Oscrints, Lat., Fab., 
To which we refer the Chlorops of Meigen. A species that I have 
received from Germany under the name of brevipennis, might how- 
ever form a separate subgenus on account of the seta of its antenne, 
which is thick, almost in the form of a stilet, and geniculate. The an- 
terior and superior extremity of the head is sometimes truncated, and 
sometimes pointed. Another dipterous Insect which was also sent to 
me from Germany, and marked Pzophila vulgaris || isin the same case 
referred by Fallen to this subgenus, differs from the other species in the seta of the 
antennez, which is simple. The palette also is larger and more orbicular. This in- 
sect, which has a cinereous body with a fulvous abdomen, is very common in the in- 
terior of our houses. The sete and dentations of the exterior margin of the wings 
form no peculiar character—it is common to several other Scatomyzides. The 
Mouche bossue of De Geer—Insect., VI, ii, 5—quoted in the first edition of this work, 
whose larva, that feeds on Aphides, has two horns posteriorly, is not an Oscina, but 
rather a Heleomyza. 
* Meigen. 
ae Meigen. 
t It is thickened at its base. 
§ Certain species in which the seta of the antennz is plumous, ache referred by 
him to the genus Tephritis, are perhaps Sapromyze. 
\| The P. scutellaris of Fallen and Meigen. The face is but very slightly silky. 
The top of the head and thorax is pilose in the Heleomyze, a subgenus that is easily 
