Black-tie dress code: two new species of the genus Toxomerus (Diptera, Syrphidae)

Abstract

Toxomerus hauseri Mengual sp. n. and Toxomerus picudus Mengual sp. n. are described from Peru and Ecuador respectively. Toxomerus circumcintus (Enderlein, 1938) is treated as a valid species and not considered synonym of Toxomerus marginatus, and Toxomerus ovatus (Hull, 1942) is considered junior synonym of Toxomerus nitidus (Schiner, 1868). An identification key for the Toxomerus species with dark abdomens is given along with diagnoses for each studied species.

Keywords: Syrphidae; Toxomerus; flower flies; identification key; new species.

Figures 1–15.

1–8 Toxomerus dispar: 1 Abdomen of pale male, dorsal 2 Abdomen of dark male, dorsal 3 Abdomen of very dark male, dorsal 4 Abdomen of dark female, dorsal 5 Abdomen of very dark male, dorsal 6 wing 7 Female genitalia: a dorsal, b ventral 8 Male genitalia, 9th tergum and associated structures: a dorsal b lateral 9 Toxomerus nitidus, abdomen of female, dorsal 10 Toxomerus flaviplurus, abdomen of female, dorsal 11 Toxomerus hieroglyphicus, abdomen of male, dorsal 12 Toxomerus laenas, abdomen of male, dorsal 13 Toxomerus sp. 1, thorax, lateral 14 Toxomerus flaviplurus, thorax, lateral 15 Toxomerus anthrax, thorax, lateral (Figs 1, 2, 4, 6, 7 and 8 from Thompson 1981; Figs 9–15 from Hull 1943).

Figures 16–29.

16 Toxomerus picudus, lateral 17 Toxomerus picudus, dorsal 18 Toxomerus hauseri, lateral 19 Toxomerus hauseri, dorsal 20 Toxomerus hauseri, head, frontal 21 Toxomerus picudus, head, frontal 22 Toxomerus hieroglyphicus, head, lateral 23 Toxomerus picudus, head, lateral 24 Toxomerus nitidus, thorax, lateral 25 Toxomerus laenas, thorax, lateral 26 Toxomerus paragrammus, abdomen, dorsal 27 Toxomerus incaicus, abdomen, dorsal 28 Toxomerus circumcinctus, male genitalia, 9th tergum and associated structures: a dorsal b lateral 29 Toxomerus anthrax, male genitalia, 9th tergum and associated structures: a dorsal b lateral.