DIPTERA. 371 
almost not) turned up inferiorly, The antenne are inserted on the 
top of the front, and sometimes even received in fossule, but they 
most commonly project, are straight and distant, and. in several as 
long as the head, or longer. In all the other Muscides they are 
always shorter than the head. 
The Muscides of the fourth division, that of the ScaromyzipEs, as 
well as those of the fifth, are distinguished from the species of the 
sixth by the following characters: the head, viewed from above, is 
never longer than it is broad, its form being nearly spherical or trian- 
gular; the posterior legs are never much longer than the body, nor 
very slender, and the body, though sometimes narrow and elongated, 
is not filiform. 
Here, the Scatomyzides are distinguished from the Muscides of the 
following division, or the Dolichocera, by their antenne, of which 
the third joint is evidently longer than the preceding one; with the 
exception of a single genus, Lowocera, they are always shorter than 
the head. The anterior and superior extremity of this latter part of 
the body rarely projects beyond the eyes, and when viewed from 
beneath usually appears almost hemispherical, and rather wider than 
it is long. 
Sometimes the posterior legs are large and distant, their thighs 
are thick or compressed, and the joints of their tarsi dilated or 
widened. The antenne are always very short, with the last joint 
lenticular or nearly globular, and furnished with a simple seta. The 
sides of the face are pilose and silky. 
TuyreEopnora, Lat., Meig.—Musca, Panz., 
Where the antennz are received into a sub-frontal cavity, with a 
lenticular, but not transverse, palette; the head gradually inclines 
from its summit to the mouth; the posterior thighs are thick, and the 
second and following joints of the tarsi are almost similar. 
All the terminal cells of the wings are closed by their posterior 
edge. The palpi are much widened at the end in the manner of a 
spatula. 
I’. cynophila, Panz., Faun. Insect. Germ. XXXIV, 32. Deep 
blue; head reddish-yellow; two black points on each wing ; 
scutellum terminated by two spines. Found on dead dogs, and 
always in autumn. According to an observation communicated 
to me by one of our most learned and zealous entomologists, M. 
Percheron, Jun., this Insect is sometimes phosphorescent, a pecu- 
larity that struck one of his friends who witnessed it in his 
chamber at night, and induced him to capture it*. 
Spu#rocera, Lat.—Borsgorvs, Meig.—Corromyza, Fall., 
Where the antennz are salient, with the palette almost hemisphe- 
rical and transversal; the head is abruptly concave below the front 
and turned up near the oral cavity, of which the superior extremity 
is bordered ; the posterior ‘thighs are compressed, and the two first 
joints of their tarsi are evidently wider than the following ones. 
The second cell of the posterior extremity of the wing—the last 
* Lat., Gener. Crust. et Insect., 1V, 358; and Meigen. 
