( iii ) 



Austen and some of the other insects by Mr. N. D. Riley 

 and Mr. G. Meade Waldo. Dr. Seitz had sent the following 

 interesting record of observations : — ■ 



Asilus barbarus, L., and its model, a small female of Salius 

 barbarus, F. — " This Asilid I failed to catch with its prey. 

 It does not appear before July, and flies in dry places and 

 settles only on sandy ground. The model, which is found 

 flying in the same localities, is I think nearly allied to the 

 American Pepsis, which supplies the commonest models for 

 insects of all Orders. I unfortunately only secured a very 

 small specimen — as a matter of fact the smallest I have seen — ■ 

 of the Fossor, which is shy and difficult to catch. The model 

 is generally of about the same size as the Asilid. 



" So far as I remember, the Asilid has the habits and flight 

 of our Asilus crabrom'formis, L., but it does not make the 

 sound of this European fly. Cmbroniformis in its flight makes 

 exactly the same sound as the common Vespa crabro, L., — 

 a very much deeper hum than that made by other large Asilids. 

 I suppose that this deep sound is also a form of mimicry, 

 just as it is in Trochilium apiforine, L., which also makes the 

 sound of Vespa crabro. This is very easy to hear when the 

 captured insect is humming in the butterfly-net. Another 

 point of resemblance between barbarus and crabroniformis 

 is the fact that both appear later in the year than any of 

 their allies. Thus barbarus does not fly before July in Algeria, 

 and crabroniformis, near Darmstadt, not before the end of 

 August, becoming commoner in September." 



Heligmoneura brunnipes, F. {Asilus castanipes, Meigen), 

 and Stenopogon heteroneurus, Macq. {Dasypogoninae) and 

 other Asilidae. — Dr. Seitz records that both these large 

 Asilids begin to fly at the end of June (May in Proc. 1913, 

 p. xliv). In addition to the butterflies mentioned by him 

 (in Proc. Ent. Soc, 1913, p. xlix) as the prey of the first- 

 named species, P. rapae, L., is now recorded together with 

 nearly all the Satyrinae flying in June and July. Dr. Seitz 

 also observed the female of the latter species devouring its 

 own male, having pierced it from the side. " The specimen 

 exhibited to the meeting was still alive when in my net but 

 evidently quite disabled and only moving the tarsi. Against 



