Trirogma Westwood, 1841

Key to the world species of the genus Trirogma Westwood, 1841 View in CoL

(females are unknown to T. nigra Cameron, 1903 ; T. prismatica F. Smith, 1858 ; T. balaensis Pu and Zhou, 1989 , T. narendrani Madhavikutty, 2004 ; male is unknown to T. pingsheensis Pu and Zhou, 1989 )

1. Female............................................................................................. 2

- Male............................................................................................... 6

2. S2 with a short, curved lateral groove, median tubercle absent. Sri Lanka..................... T. regalis Krombein, 1979 View in CoL

- S2 with a bisinuate groove interrupted by median tubercle..................................................... 3

3. Frons with punctures and dense, irregular, reticular ridges..................................................... 4

- Frons only with punctures, without reticular ridges........................................................... 5

4. Frons immediately above platform with a deep, transverse bisinuate groove; scutum with dense, large punctures medially, each sides with dense, irregular, reticular ridges. India; China ( Yunnan, Guangdong, Zhejiang)............................................................................................... T. kohima Girish Kumar and Sheela, 2018 View in CoL

- Frons immediately above platform without groove; scutum with sparse, irregular punctures. China ( Guangxi)..................................................................................... T. pingsheensis Pu and Zhou, 1989 View in CoL

5. Upper mesopleural groove crenulate; basal margin of frontal lobe not extended. India, Indonesia, Singapore, Sulawesi, Iran, Iraq, Turkey, Saudi Arabia, United Arab Emirates, Sri Lanka, China ( Yunnan, Zhejiang, Fujian, Hong Kong, Taiwan).................................................................................... T. caerulea Westwood, 1841 View in CoL

- Upper mesopleural groove not crenulate; basal margin of frontal lobe extended on both sides, forming curved, folded lobe-like projections. China ( Yunnan, Guangdong).......................................... Trirogma lobusicurvus sp. nov.

6. Body black; metasomal sterna densely covered with white, long hairs. Sarawak (Borneo).......... T. nigra Cameron, 1903 View in CoL

- Body with bright metallic color; metasomal sterna without white, long hairs....................................... 7

7. Mandible ivory or white on basal half..................................................................... 8

- Mandible black on basal half............................................................................ 9

8. Body metallic purple; posterolateral tubercles of pronotal collar small and round. Sri Lanka...... T. regalis Krombein, 1979 View in CoL

- Head and mesosoma metallic green, metasoma metallic violet-blue; posterolateral tubercles of pronotal collar large and sharp. Malaysia...................................................................... T. prismatica F. Smith, 1858 View in CoL

9. S2 with only a short, curved lateral groove, median tubercle absent. India............... T. narendrani Madhavikutty, 2004 View in CoL

- S2 with a bisinuate groove interrupted by median tubercle.................................................... 10

10. Scutellum with a cone-like projection at middle............................................................ 11

- Scutellum without projection at middle................................................................... 12

11. Frons immediately above platform with a deep, transverse bisinuate groove. India, China ( Yunnan, Guangdong, Zhejiang)..................................................................... T. kohima Girish Kumar and Sheela, 2018 View in CoL

- Frons immediately above platform without groove. India, Indonesia, Singapore, Sulawesi, Iran, Iraq, Turkey, Saudi Arabia, United Arab Emirates, Sri Lanka, China ( Yunnan, Zhejiang, Fujian, Hong Kong, Taiwan)...... T. caerulea Westwood, 1841 View in CoL

12. Basal margin of frontal lobe extended on both sides, forming curve, folded lobe-like projections; pronotum and scutum with dense, fine punctures. China ( Yunnan, Guangdong).................................. Trirogma lobusicurvus sp. nov.

- Basal margin of frontal lobe not extended; mesosoma smooth, without punctures. China ( Guangxi)................................................................................................ T. balaensis Pu and Zhou, 1989 View in CoL