Eur. J. Entomol. 95: 65-86, 1998 ISSN 1210-5759 Descriptions of bamboo-inhabiting larvae and puparia of Oriental soldier flies Ptecticus brunettii andP. flavifemoratus (Diptera: Stratiomyidae: Sarginae) with observations on their biology Rudolf ROZKOŠNÝ and Damir KOVAC Department of Zoology and Ecology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic; e-mail:
[email protected] Forschungsinstitut Senckenberg, Senckenberganlage 25, 60325 Frankfurt am Main, Germany; e-mail:
[email protected] Stratiomyidae, Sarginae,Ptecticus, larvae, puparia, mouth parts, developmental cycle, territoriality, spatial segregation, diapause, plastron, bamboo, phytoteimata, Malaysia Abstract. The first detailed description of larvae of Ptecticus Loew is presented for P. brunettii and P. flavifemoratus from West Malaysia. There are pronounced morphological and behavioural differences be tween the last larval instar, inside whose cast cuticle the pupa remains, and earlier instars. The larval mouthparts are similar to those of other known Stratiomyidae larvae but may display a set of autapomor- phic characters. The structure of the mandibular-maxillary complex suggests that larvae of Ptecticus are micropantophagous scavengers that feed chiefly upon microorganisms. The larvae of both species are as sociated with decaying bamboo shoots; P. brunettii inhabits the space between the culm sheaths and P. flavifemoratus lives in water-filled shoot stumps. This is the first record of aquatic Sarginae larvae and egg plastron in the Stratiomyidae. The life cycle and behaviour of P. brunettii and P. flavifemoratus is de scribed and the resource partitioning of stratiomyids and xylomyids associated with bamboo is discussed. INTRODUCTION Stratiomyidae and Xylomyidae are the only families among the lower Brachycera (Or- thorrapha) in which the pupae are formed within the hardened skin of the last larval instar (overview see McFadden, 1967; Rozkošný, 1982; Smith, 1989).