329 



Ancilorhyncuus, Lat., 

 Where the stilet of the antennie is hardly salient and pointed, and 

 where tlie proboscis has the form of a compressed, arcuated, and 

 hooked rostrum *. 



Dasypogon, Meicj. Fab., 

 Where that stilet is very distinct and conical, and the proboscis is 

 straight f . 



In the two following subgenera the antennse are manifestly longer 

 than the head, and frequently placed on a common pedicle; the stilet 

 is elongated and of the same thickness as the antennae, at the end of 

 which it forms two joints, the second longest, almost cylindrical or 

 ovoid, and terminating in an obtuse point. In 



Ckraturgus, Wied., 

 The antennra are not implanted on a common tubercle, and their first 

 joint is shorter than the second |. In 



DiocTRix, Met fj. 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 antennae is prolonged in the form of 

 a seta. 



Those in which this seta is simple form the subgenus 



AsiLUs^rojt3e?-. 

 In Europe towards the close of summer we frequently find the 

 A. crabroni formic, L ; De Geer, Ins,, VI, xiv. 3. It is 

 about an inch long, and of an ochre-yellow ; three first abdo- 

 minal annuli of a velvet-black, the rest fulvous-yellow ; wings 

 russet. The metamorphosis of this species as well as that of the 

 A. forcipatus, Lin., has been carefully observed |1. 

 Those, in which the seta of the antennse is plumous, form the sub- 

 genus 



Ojimatius, Illig. Weid. ^ 

 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 tlie East 

 Indies. 



f Sec the authors already quoted. 



:J Ibid., Anal. Entom., pi. i. 5. 



§ The same authors. 



II For the other species an 1 these various subgenera, see Latreille, Meigcn, Fa- 

 bricius, Wiedemann, and Macquart. I presumed that the genus Ci/rtoma of Meigen 

 should not be arranged with the Platypezinit, but with the Empides, according to 

 the opinion of Fallen. M. Macquart has in fact lately referred them to tlie latter. 

 This subgenus is distinguished from all those of this division, furnished like it with 

 blarticulated antennce, and in which the palpi are incumbent on the trunk, by the 

 elongated and conical form of the last joint of the antennre, by the wings, and by 

 the smalhicss of the palpi. For other details, see Macquart's work, Dipt, du nord 

 de la France. 



^ Wied., Dip., Exot., 213. 



VOL. IV Z 



