DIPTERA. 329 
ANcILoRHyNcHUs, Lat., 
Where the stilet of the antennz is hardly salient and pointed, and 
where the proboscis has the form of a compressed, arcuated, and 
hooked rostrum *, 
Dasypocon, Meiq. Fab., 
Where that stilet is very distinct and conical, and the proboscis is 
straight f. 
In the two following subgenera the antenne are manifestly longer 
than the head, and frequently placed ona common pedicle; the stilet 
is elongated and of the same thickness as the antenne, at the end of 
which it forms two joints, the second longest, almost cylindrical or 
ovoid, and terminating in an obtuse point. In 
Creratureus, Wied., 
The antenne are not implanted on a common tubercle, and their first 
joint is shorter than the second ¢. In 
Driocrria, Meig. Fab. 
These organs are situated on a common peduncle and their first joint 
is longer than the following one §. 
There, the terminal stilet of the antennz is prolonged in the form of 
a seta. 
Those in which this seta is simple form the subgenus 
ASILUs proper. 
In Europe towards the close of summer we frequently find the 
A. crabroniformis, L; De Geer, Ins., VI, xiv. 3. It is 
about an inch long, and of an ochre-yellow; three first abdo- 
minal annuliof a velvet-black, the rest fulvous-yellow ; wings 
russet. ‘The metamorphosis of this species as well as that of the 
A. forctpatus, Lin., has been carefully observed ||. 
Those, in which the seta of the antenne is plumous, form the sub- 
genus 
Ommativs, Illig. Weid. 4 
Sometimes the tarsi are terminated by three hooks, the inter- 
mediate of which replaces the two pellets. 
* Two species collected by Count Dejean in Dalmatia, and another in the East 
Indies. 
+ See the authors already quoted. 
~ Ibid., Anal. Entom., pl. i. 5. 
§ The same authors. 
|| For the other species and these various subgenera, see Latreille, Meigen, Fa- 
bricius, Wiedemann, and Macquart. I presumed that the genus Cyrtoma of Meigen 
should not be arranged with the Platypezinew, but with the Empides, according to 
the opinion of Fallen. M. Macquart has in fact lately referred them to the latter. 
This subgenus is distinguished from all those of this division, furnished like it with 
biarticulated antenne, and in which the palpi are incumbent on the trunk, by the 
elongated and conical form of the last joint of the antennz, by the wings, and by 
the smallness of the palpi. For other details, see Macquart’s work, Dipt. du nord 
de la France. 
§] Wied., Dip., Exot., 213. 
VOL,IV. Z 
