Abstract
Trieces Townes, 1946 is one of the largest metopiine genera for which species have been described from all zoogeographical regions except the Indomalayan. The present study reports a major range extension of Trieces with the description of three new species from India. The described species are members of the onitis species group. An identification key to the Palearctic and Indomalayan species of the onitis group is included with the revised generic diagnosis and a key to separate Trieces from its closest genus Chorinaeus. Distribution pattern and character plasticity of Trieces are also discussed.
Highlights
The Darwin wasp subfamily Metopiinae Förster, 1869 comprises larval-pupal koinobiont endoparasitoids of Lepidoptera Linnaeus, 1758 (Gauld et al 2002; Mazón & Bordera 2016; Broad et al 2018)
The present study reports on the distribution of Trieces for the first time from the Indomalayan region with the description of three new species, T. irwini sp. nov., T. isolatus sp. nov. and T. orientalis sp. nov. from India
Redefinition and character plasticity of onitis species group Townes & Townes (1959) defined the onitis species group of the genus Trieces based on the following morphological characters: head wide to very wide; eyes sparsely setose; metapleuron setose anteriorly, with longitudinal wrinkles on posterior half and a distinct posterior slit-like depression
Summary
The Darwin wasp subfamily Metopiinae Förster, 1869 comprises larval-pupal koinobiont endoparasitoids of Lepidoptera Linnaeus, 1758 (Gauld et al 2002; Mazón & Bordera 2016; Broad et al 2018). This subfamily has more than 862 species in 27 genera (Yu et al 2016). Most of the known species are reported from dry shrubby habitats (Townes & Townes 1959; Zhang et al 2016)
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