366 INSECTA. 
‘The abdomen of the other Creophilz is but slightly elongated and 
triangular ; the wings do not vibrate. 
Puania, Meigq., 
Where the posterior extremity of the abdomen is elongated, narrowed 
and bent underneath. The third joint of the antenne is elongated 
and linear. The wings, according to the figures of Meigen, closely 
resemble those of the preceding subgenus. According to the same 
author, the abdomen, as in the Lophosiz and Ocypteree, presents but 
four apparent annuli*. In the subgenus 
Xysta, Meig., 
There are from five to six. The antenne are short, and their twe 
last joints nearly of an equal length. The posterior tibie are slightly 
arcuated, compressed and ciliated. 
This subgenus appears to us to constitute the transition from the 
Gymnosomiz to the Phasiz, and also to approach the Trichiopoda. 
The equivocal nature of the character drawn from the presence or 
absence of hairs on the face of the head, employed by M. Meigen, is 
easily perceived. Certain species of Trichiopoda are ambiguous in 
this very respect f. 
Tacuina, Fab., Meig., 
Where the abdomen is not curved underneath at its posterior extre- 
mity, and exhibits externally but four annuli. The antenne are as 
long as the head or nearly so, and terminated by a joint longer than 
the penultimate. 
Certain species, forming a particular section, in their larva state 
inhabit the body of various caterpillars, which they destroy f. 
We now pass to Creophilee in which the seta of the antenne is evi- 
dently pilose or plumous. ‘Their third joint always forms an elon- 
gated palette, longer than the preceding one. 
Dexia, Meigq. 
The Dexiz have the general appearance of the Ocyptere, their 
abdomen being narrow and elongated, particularly in the males §. 
Musca, Lin., Fab., Meig—Mesemprina, Meig. 
In Musca, properly so called, or the true Fly, the abdomen is tri- 
angular, and the eyes are contiguous posteriorly, or closely approxi- 
mated in the males. 
Here come most of those Flies whose larve feed on carrion, meat, 
&c.; others of the same subgenus inhabit dung. They all resemble 
soft, whitish worms without feet, thickest and truncated at the pos- 
terior extremity, and becoming gradually smaller towards the oppo- 
site one, which terminates in a point furnished with two hooks, with 
* See Meigen. 
7 Idem. 
~ This genus also is in great confusion in the work of Meigen, and consists of 
species with very different antenne and wings, as is evident from his figures. We 
have removed the Echinomyie and the Melanophore : until the work of Dr. Des- 
yoidy is published we will leave the other Spegies in the genus Yachina. 
§ See Meigen. 
