DIPTERA. 345 
a strangulated club, slightly geniculate in the middle, the inferior 
portion resembling an elongated cone, and the other an oval palette. 
The scutellum is unarmed. 
HermetiA, Lat., Fab. * 
The antennz of the others are never much longer than the head, 
and terminate by an almost cylindrical or elongated and conical 
joint. 
Here, the scutellum is spineless, 
Xyiopwacus, Meig., Fab., Lat., 
Or Xylophagus proper, where the body is narrow and elongated, 
and the antenne are evidently somewhat longer than the head, and 
terminated by an almost cylindrical joint. The head is short, trans- 
versal, and without any particular elevation anteriorly. 
X. ater, Lat., Gen. Crust., et Insect., I, xvi, 9, 10. Elongated; 
black; the mouth, a line on each side of the thorax, scutellum 
and legs, yellow. Found in the month of May, in the wounds, 
&c. of the Elm f. 
AcAanTHOMERA, Weigq., 
Where the antenne, as long as the head at most, terminate by a 
joint, forming an elongated cone, or almost resembling a punch, 
and compressed, of which the first ring is larger than the others ; 
in this respect it bears some analogy to that of Tabanus. The head 
is hemispherical and the eyes are very large. The abdomen is broad 
and flattened, and the interccular space presents inferiorly a projec- 
tion in the form of a horn or pointed rostrum. The two joints of 
the palpi are of equal length. 
In another genus 
RapruHiorHyncHus, Vied., 
The first joint of these palpi is very short, and the second, much 
longer, terminates in a point. The remaining characters are iden- 
tical with those of Acanthomera. The species of both these genera 
belong to South America f. 
There, the scutellum is armed with spines. 
In these, the antennz are simple. 
CanomyiA, Lat., Metg.—Sicus, Fab. 
They are closely allied to the two preceding subgenera. The an- 
tennz are hardly longer than the head, with the third joint conical 
or in the form of a punch; the first is evidently longer than the fol- 
lowing one. The palpi are very apparent and cylindrical, terminate 
in a point and consist of two equal joints. The scutellum is armed 
with two spines. 
C. ferruginea; Sicus ferrugineus, Fab., Meig., Dipt., II, xii, 
16,25. Russet, with yellow or whitish spots or streaks on the 
abdomen. It sometimes varies, the thorax being occasionally 
* See Lat. and Fab. 
+The same works. Meig., Macq., family of the Xylophagi, and Wied. 
t Wied., Dipt. Exot., II, 1, 1. 
VOL. IV. AA 
