Trirogma Westwood, 1841

Liu, Zhi-Zhi, Ma, Li & Li, Qiang, 2024, One new species and one new record of the genus Trirogma Westwood (Hymenoptera: Ampulicidae) in China, with a key to the world species, Zootaxa 5538 (5), pp. 448-456 : 449-450

Key to the world species of the genus Trirogma Westwood, 1841

(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

- 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

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

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

- 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

- 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

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

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

- 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

- 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

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