Terrobittacus Tan & Hua, 2009

Du, Wei & Hua, Bao-Zhen, 2017, Two new species of the genus Terrobittacus Tan & Hua, 2009 (Mecoptera: Bittacidae) from southwestern China with a key to species, European Journal of Taxonomy 294, pp. 1-13 : 2-3

Genus Terrobittacus Tan & Hua, 2009

Terrobittacus Tan & Hua, 2009b: 2938 .

Type species: Bittacus implicatus Huang & Hua in Cai et al., 2006 by original designation.

Diagnosis

The genus can be recognized by the following characters: 1) wings with one pterostigmal cross-vein; 2) tarsomere IV with one spine on each side; 3) male epandrial appendages distinctly shorter than half the length of the gonocoxites, except for T. rostratus sp. nov. with epandrial appendages slightly longer than half the length of the gonocoxites; aedeagal lobes small and acute; tergum X strongly vestigial dorsally; sex pheromone glands single-lobed; 4) the two halves of the subgenital plate almost fused completely in the female.

Key to the species of Terrobittacus (♂, modified from Tan & Hua 2009b)

1. Thorax with a distinct pale yellowish streak mesally; wings with cross-veins r-m and m connected at fork of M 1+2 (FM 1+2); cerci longer than epandrial appendages; gonocoxites with one to three pairs of long convergent bristles apically ………………………………… T. longisetus Tan & Hua, 2009

– Thorax without a distinct mesal streak; cross-veins r-m and m connected before FM 1+2; cerci shorter than epandrial appendages; gonocoxites without long bristles apically …………………2

2. Blackish brown cloudings diffused along most cross-veins forming two noticeable bands or along R 5 with a brown fleck; proctiger pointed, with its apex rounded …………………………3

– No noticeable marked bands along cross-veins; apex of proctiger not rounded ………………4

3. Epandrial appendages roughly trapezoid in lateral view ………………………………………… …………………………………………………… T. echinatus (Hua & Huang in Hua et al. 2008)

– Epandrial appendages clavate in lateral view ……………………………… T. angustus sp. nov.

4. Proctiger slender, sabre-shaped, curved caudad, acute apically ………… T. xiphicus Tan & Hua, 2009

– Proctiger relatively thick; apex curved caudoventrally into a hook, like rostrum of a parrot ………5

5. Epandrial appendages boot-shaped in lateral view …………………………… T. rostratus sp. nov.

– Epandrial appendages triangular in lateral view … T. implicatus (Huang & Hua in Cai et al., 2006)