Lasioglossum (Leuchalictus)

Murao, Ryuki, Yeh, Wen-Chi & Lu, Sheng-Shan, 2023, A review of Lasioglossum (Leuchalictus) in Taiwan (Hymenoptera: Apoidea: Halictidae), Acta Entomologica Musei Nationalis Pragae 63 (2), pp. 363-382 : 380-381

Key to the species of Lasioglossum (Leuchalictus) in Taiwan

1 Females. .................................................................... 2

– Males. ....................................................................... 4

2 Pronotal dorsolateral angle projected and acute ( Fig. 6B ); mesoscutum with anterior edge reflexed upward, medio-anterior area with punctures forming dense transverse ridge; T1 basally with dense, thick tomentum ( Fig. 6D ). ................................................... ................. L. subopacum subopacum ( Smith, 1853)

– Pronotal dorsolateral angle not projected, rather obtuse ( Figs 2B , 10B ); mesoscutum flat and punctate or reticulate punctate on medio-anterior margin; T1 without tomentum as in Figs 2D , 10D . ................... 3

3 Vertex long, OCD approximately 2.8× diameter of ocelli; genal area longer than eye width, GW approximately 1.2–1.4× EW; mesoscutum anteriorly with reticulate PP, but not coarse; metapostnotum with longitudinal ridges ( Fig. 10C ); disc of T1 medialy with sparser PP as in Fig. 10D (IS = 1.0–3.5 d); T4 distinctly sloped on medial to apical area ( Fig. 10E ). ...... ............................................... L. subinoum sp. nov.

– Vertex short, OCD approximately 2× diameter of ocelli; genal area shorter than eye width, GW approximately 0.8–0.9× EW; mesoscutum anteriorly with coarse reticulate PP; metapostnotum with reticulate ridges ( Fig. 2C ); disc of T1 medialy with denser PP as in Fig. 2D (IS = 0.5–1.5 d); T4 flat ( Fig. 2E ). .............................. ..................................... L. formosae ( Strand, 1910)

4. Vertex long as in female, OCD approximately 3.8× diameter of ocelli; clypeus black, without yellow spot ( Fig. 11A ); genal area longer than eye width as in female, GW approximately 1.1–1.6× EW; T1 medially with sparser PP as in Fig. 11D (IS = 1.0–2.7 d); T7 ( Fig. 11E ) with well depeloped lateral projection that exceeds tip of T7; hair tuft on S6 elongate ( Fig. 11F ). ............................................... L. subinoum sp. nov.

– Vertex short, OCD approximately 1.9× diameter of ocelli; clypeus with yellow spot on lower half ( Figs 3A , 7A ); genal area shorter than eye width, GW approximately 0.7–0.8× EW; T1 medially with denser PP as in Figs 3D , 7D (IS = 0.5–1.5 d); T7 without distinct lateral projection; hair tuft on S6 broad Ո shaped ( Figs 3E , 7E )........................................................................5

5. Mesoscutum with anterior edge reflexed upward; T1 basally with moderately dense, thin tomentum. .......... ............... L. subopacum subopacum ( Smith, 1853)

– Mesoscutum flat; T1 without tomentum. ..................... ...................................... L. formosae ( Strand, 1910)

Figures

Figs 2A–E. Lasioglossum (Leuchalictus) formosae (Strand, 1910), female. A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 2nd metasomal terga; E – 4th to 6th metasomal terga.

Figs 3A–E. Lasioglossum (Leuchalictus) formosae (Strand, 1910), male. A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 2nd metasomal terga; E – 3rd to 6th metasomal sterna.

Figs 6A–E. Lasioglossum (Leuchalictus) subopacum subopacum (Smith, 1853), female.A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 2nd metasomal terga; E – 5th to 6th metasomal terga.

Figs 7A–E. Lasioglossum (Leuchalictus) subopacum subopacum (Smith, 1853), male. A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 2nd metasomal terga; E – 4th to 6th metasomal sterna.

Figs 10A–E. Lasioglossum (Leuchalictus) subinoum sp. nov., paratype, female.A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 2nd metasomal terga; E – 3rd to 6th metasomal terga.

Figs 11A–F. Lasioglossum (Leuchalictus) subinoum sp. nov., holotype, male.A – head in frontal view; B – mesoscutum; C – metapostnotum; D – 1st to 3rd metasomal terga; E – 3rd to 7th metasomal terga; F – 3rd to 6th metasomal sterna.