Lasioglossum

Murao, Ryuki, Lee, Heung-Sik & Tadauchi, Osamu, 2015, Bees of the Lasioglossum series (Hymenoptera: Halictidae) in South Korea, with an illustrated keys to species, Zootaxa 4044 (4), pp. 511-534 : 530-531

Key to the species of the Lasioglossum series in South Korea

Females

1. Mesoscutum with anterior edge reflexed upward, medio-anterior region with punctures forming a dense transverse ridge (Fig.

2A); T1 basally with dense, thick tomentum (Fig. 2B).................... Lasioglossum subopacum subopacum (Smith) - Mesoscutum flat and punctate on medio-anterior margin (Fig. 2C); T1 without tomentum (Fig. 2D).................... 2 2. Metapostnotum and posterior surface of propodeum demarcated by transverse carina on posterior margin of metapostnotum

(sometimes weakly so) (Fig. 2E)......................................................................... 3 - Metapostnotum and posterior surface of propodeum demarcated by distinct oblique carina on posterior surface (Figs. 2F, 4D)

or not distinctly demarcated by carina ( Fig. 4 C).............................................................. 7 3. Metapostnotum of propodeum dull, with distinct tessellation among ridges ( Fig. 3A ).............. … L. exiliceps (Vachal) - Metapostnotum of propodeum shiny, nearly smooth among ridges ( Fig. 3B )....................................... 4 4. Posterior surface of propodeum with complete carina extending dorsally to transverse carina ( Fig. 3 C)...................

.................................................................................. L. proximatum (Smith) - Posterior surface of propodeum with incomplete carina not extending to transverse carina ( Fig. 3 D).................... 5 5. Supraclypeus shiny, with very weak tessellation ( Fig. 3 E); T1 medially with sparser PP (IS = 7 d in maximimu; Fig. 4A )....

......................................................................... L. primavera Sakagami & Maeta - Supraclypeus dull, with distinct tessellation ( Fig. 3 F); T1 medially with denser PP (IS = 1.5 d in maximum; Fig. 4B )........

................................................................................. L. sutshanicum Pesenko 6. Propodeum with ratio between width of apex of oblique ridges (bidirectional arrows in Fig. 4 C) and maximum width of poste-

rior surface 0.38–0.68 (n = 13)........................................................................... 7 - Propodeum with ratio between width of apex of oblique ridges (bidirectional arrows in Fig. 4 D) and maximum width of poste-

rior surface 0.05–0.2 (n = 14)............................................................................ 9 7. PP on T1 basally and medially with dense PP (IS = 1–1.5 d; Fig. 4 E).......................... L. upinense (Morawitz) - PP on T1 medially sparser than that on both basally and apically (IS =>1.5 d in maximum; Fig. 4 F).................... 8 8. Mesoscutum and mesoscutellum mixed with dark hairs; PP on lower declivitous surface of T1 sparser than below species (IS =

4.5 d in maximum; Fig. 5A )…............................................ L. nipponicola Sakagami & Tadauchi - Mesoscutum and mesoscutellum with pale yellowish brown hairs over entire surface, not mixed with dark ones; PP on lower

declivitous surface of T1 denser than above species (IS = 2 d in maxmimu; Fig. 5B )............. L. kansuense (Blüthgen) 9. Mesoscutum medially to posteriorly with sparser PP (IS = 3 d in maximum; Fig. 5 C)............ L. denticolle (Morawitz) - Mesoscutum medially to posteriorly with denser PP (IS = 1 d in maximum; Fig. 5 D)............................... 10 10. Integument of mesoscutum with distinct tessellation; lateral and posterior surfaces of propodeum with dense tomentose hairs.

............................................................................. L. circularum Fan & Ebmer - Integument of mesoscutum nearly smooth; lateral and posterior surfaces of propodeum with sparse tomentose hairs....... 11 11. Lateral and oblique carinae of posterior surface of propodeum strongly developed ( Fig. 6A ); submedial patch of T1 with

sparser PP (IS = 3.5 d in maximum; Fig. 6 C)................................................. L. occidens (Smith) - Lateral and oblique carinae of posterior surface of propodeum more weakly developed ( Fig. 6B ); submedial patch of T1 with

denser PP (IS = 2 d in maximum; Fig. 6 D)................................................. L. formosae (Strand)

Males

The male of L. sutshanicum could not examine in the present study. Therefore, it is not include in the following key.

1. Mesoscutum reflexed upward on medio-anterior margin similar to Fig. 2A............ L. subopacum subopacum (Smith)

- Mesoscutum flat on medio-anterior margin such as Fig. 2C.................................................... 2

2. Mesoscutum medially and posteriorly with sparser PP (IS = 3 d in maxmimum) such as Fig. 5 C... L. denticolle (Morawitz)

- Mesoscutum medially and posteriorly with denser PP (IS = 1.5 d in maximum) such as Fig. 5 D........................ 3

3. S6 with a unique hair tuft ( Figs. 7–8 )...................................................................... 4

- S6 without hair tuft.................................................................................... 9

4. Hair tuft on S6 ∩ or Ω shaped ( Figs. 7A–C , 8B–C )........................................................... 5

- Hair tuft on S6 of different shape ( Figs. 7D , 8A, 8D ).......................................................... 7

5. Apical part of hair tuft on S6 longitudinally narrow ( Fig. 7A )............................ L. circularum Fan & Ebmer

- Apical part of hair tuft on S6 thick ( Figs. 7B–C , 8B–C )....................................................... 6

6. Submedial patch of T1 with sparser PP in both sexes (IS = 3.5 d in maximum; white circle in Fig. 6 C)... L. occidens (Smith)

- Submedial patch of T1 with denser PP in both sexes (IS = 2 d in maximum; white circle in Fig. 6 D)... L. formosae (Strand)

7. Hair tuft on S6 boomerang-shaped ( Fig. 8D )............................................. L. upinense (Morawitz)

- Hair tuft on S6 of different shape ( Figs. 7D , 8A )............................................................. 8

8. Apical part of hair tuft on S6 small and short ( Fig. 8A )......................... L. nipponicola Sakagami & Tadauchi

- Apical part of hair tuft on S6 longitudinally elongate ( Fig. 7D ).............................. L. kansuense (Blüthgen)

9. Head nearly as long as wide or slightly longer than wide (HL/HW ratio = 0.98–1.06, n = 10).......... L. exiliceps (Vachal)

- Head broader than long (HL/HW ratio = 0.85–0.91, n = 10).................................................... 5

10. F2 approximately 2× F1; male genitalia with ventral retrorse lobe............................. L. proximatum (Smith)

- F2 approximately 1.2× F1; male genitalia without ventral retrorse lobe................ L. primavera Sakagami & Maeta

Figures

FIGURE 4. A, B, E, F: T 1. C, D: posterior surface of propodeum. A: Lasioglossum primavera Sakagami & Maeta. B: L. sutshanicum Pesenko. C, F: L. kansuense (Blüthgen). D: L. occidens (Smith). E: L. upinense (Morawitz). A – F: ♀.

FIGURE 3. A, B: metapostnotum of propodeum. C, D: propodeum. E, F: supraclypeus. A: Lasioglossum exiliceps (Vachal). B, E: L. primavera Sakagami & Maeta. C: L. proximatum (Smith). D, F: L. sutshanicum Pesenko. A – F: ♀.

FIGURE 5. A, B: basal area of T 1. C, D: mesoscutum. A: Lasioglossum nipponicola Sakagami & Tadauchi. B: L. kansuense (Blüthgen). C: L. denticolle (Morawitz). D: L. occidens (Smith). A – D: ♀.

FIGURE 6. A, B: propodeum. C, D: submedial patch of T 1 encircled. A, C: Lasioglossum occidens (Smith). B, D: L. formosae (Strand). A, B: ♀. C, D: ♂.

FIGURE 7. A – D: hair tufts on S 6. A: Lasioglossum circularum Fan & Ebmer. B: L. denticolle (Morawitz). C: L. formosae (Strand). D: L. kansuense (Blüthgen). A – D: ♂.

FIGURE 8. A – D: hair tufts on S 6. A: Lasioglossum nipponicola Sakagami & Tadauchi. B: L. occidens (Smith). C: Lasioglossum subopacum (Smith). D: L. upinense (Morawitz). A – D: ♂.