. British journal of entomology and natural history. Natural history; Entomology. BR. J. ENT. NAT 12: 1999 233 emerged from the smallest cocoon. This presumably was the result of a female C. megacephalus finding a ready-made gallery and opportunistically taking it over as a brood chamber. Secondly, 2 S-i and 2 9$ Ectemnius ruficomis (Zett.), the rightful inhabitants of the nest, emerged between The caches of food provided by E. ruficomis for its larvae had consisted entirely of hoverflies (Diptera; Syrphidae). The identifiable species present and their numbers were: Rhingi
. British journal of entomology and natural history. Natural history; Entomology. BR. J. ENT. NAT 12: 1999 233 emerged from the smallest cocoon. This presumably was the result of a female C. megacephalus finding a ready-made gallery and opportunistically taking it over as a brood chamber. Secondly, 2 S-i and 2 9$ Ectemnius ruficomis (Zett.), the rightful inhabitants of the nest, emerged between The caches of food provided by E. ruficomis for its larvae had consisted entirely of hoverflies (Diptera; Syrphidae). The identifiable species present and their numbers were: Rhingia campestris Meigen Meliscaeva cinctella (Zett.) Chrysotoxum bicinctum (L.) Platycheirus {Pyrophaena) grcmditarsus (Forster) 1? 1? The end of the gallery containing the smallest cocoon that produced the C megacephalus was not noticeably different in its provisioning to the others. This may be a coincidence or it may indicate that it was provisioned by E. ruficomis before being taken over by C. megacephalusl Ectemnius ruficomis does not appear to have been previously recorded from Scotland. However, as the present account indicates, the species is present and breeding at least in the Scottish Borders. Previous British records of the species are from south of a line from Grange-over-Sands to Scarborough (Edwards, 1998) or from north-east Ireland (Richards, 1980). The ends of two galleries were almost devoid of larval food remains but were still sealed with a sawdust plug. In place of the aculeate cocoon there was a single long cylindrical dipteran puparium. These puparia were a shiny dark reddish brown and some 9 mm long. Detail of the posterior spiracular region is shown in Fig. 2. Between. Figure 2. Details of the posterior end of the puparium of Eustalomyia festiva. Scale- bar = 1 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly re
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