418 Transactions of the Society. 



Four preparations, two of S. lutaria F. and two of S. stercoraria 

 L., show what, by comparison, I consider the digested juice or 

 blood of insects. These insects are fiercely predaceous, but I have 

 found them in numbers on the blossom of the Ivy (Hedera) in the 

 autumn, but whether to feed, or from their interest in the other 

 flies, who are even more numerous, I am not absolutely certain. 



I think I can distinguish a little animal debris, hair, etc., in 

 the excreta of a & lutaria that I collected in Jersey. 



A male and female of Fucellia fucorum Fin. both show an 

 appearance similar to that seen in the Scatophagidse. Another 

 shows some curious minute circles with a dot in the middle when 

 the thinner parts of the intestine are examined with the higher 

 power. 



A female of Norellia spinimana Mg. shows a few hairs clustered 

 into a bunch, while a male of the same species has the abdomen 

 full of masses of hair and a great number of scales of a gnat 

 (Culex) or gnats. These are in greater number than in E. livida, 

 already described, and in masses, while in the female and in 

 E. livida they seem to be in pellets. It is interesting that in 

 Prof. Poulton's paper,* there is no mention of Culicidse as prey, 

 or of N. spinimana as predaceous, though there are twenty records 

 of different insects, mostly Diptera, being captured in the grasp of 

 E. livida. 



Heliomyzid^e. — Helomyza rufa Fin. has been feeding on small- 

 sized pollen, while H. similis shows a preference for larger. Of a 

 female of this genus, I can reconstruct the following history :— 

 She was very young, as not only are the wings perfect, but the 

 insect is virgin, not having been impregnated ; this can be seen 

 by the receptacula seminis, which are quite clear and empty. 

 While feeding, or possibly immediately after emerging from the 

 pupa case, she had been attacked by a small ichneumon, which 



* Predaceous Insects and their Prey. Prof. E. B. Poulton, F.R.S., Trans 

 Entom. Soc, London, Jan. 23, 1907. 



EXPLANATION OP PLATE X. 



Fig. 33.— Photograph' of another part of the abdomen of Odonata (Dragon- 

 fly). E. civilis, showing fragments, particularly the jaws of Lepidopterous larva. 



Fig. 34. — Photograph of part of the abdomen of a Hawk or Hover fly, Syrphus 

 balteatus Deg. 8 , showing pollen-grains in stomach. 



Note. — The following letters are used in the mouth-parts throughout the plates. 



-i-i i P r - Paraslossa. % 



m. Mandible. f ^ Ligu f a 



I. Lacinia. 



I p. Labial palpus 

 g. Galea. L Palpiger 



mp Maxillary palpus. - Maxilla. * £ Mentum. 



pf. Palpifer. s m Submentum. 



s - Stipes. ltm Labrum. 



c - Cardo - h. Hypopharynx. 



Labium. 



