Description of the egg and larva of Euphranta connexa (Fabricius) (Diptera: Tephritidae) and of the egg of its parasitoid Scambus brevicornis (Gravenhorst) (Hymenoptera: Ichneumonoidea) LARS-ÅKE JANZON The eggs of Euphranta connexa (Fabricius) and Scambus brevicornis (Gravenhorst) are described for the first time. Although the 3rd instar larva of E. connexa has briefly been described from Czechoslovakia, Swedish specimens are shorter, have fewer tubules in the anterior respiratory organ and the interspiracular bristles of the posterior respiratory organ look different. SEM studies of the 3rd instar larva also revealed ultrastructural characters of taxonomic significance. This is clearly shown in comparisons made with other tephritid species. L.-Å. Janzon, Sect. of Ent., Swedish Mus. Nat. Hist., Box 50007, S-104 05 Stockholm, Sweden. Pods of Vincmoxicum hirundinaria Medicus (syn. Cynanchum vincetoxicum (L.) Person) were collected in Sweden at Tullgarn (17°36'N, 58°51'E) near Stockholm, during September 1979. The main aim of the investigation was to determine the frequency of pods infested by the fruit-fly Euphranta connexa (Fabricius) (Janzon & Sillen-Tullberg, unpubl.). The pods contained only the larva of E. connexa and/or its parasitoid Scambus brevicornis (Gravenhorst). It is known that E. connexa attacks V. hirundinaria (von Hendel 1927, S6guy 1934). The third-instar larva
Insect Systematics & Evolution – Brill
Published: Jan 1, 1982
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