Chalybion bengalense ( Dahlbom, 1845 )

Pham, Phong Huy, Ohl, Michael, Nguyen, Anh Thi Tu & Nguyen, Dinh Thi, 2025, Taxonomy of the genus Chalybion Dahlbom, 1843 (Hymenoptera: Sphecidae) from Vietnam, with description of a new species, Zootaxa 5679 (4), pp. 573-584 : 575

Chalybion bengalense ( Dahlbom, 1845)

( Figs 1–6 )

Material examined. VIETNAM. Son La: 21 ♀♀, 16 ♂♂; Son La city, Phu Yen, Van Ho, Thuan Chau, and Sop Cop districts; the material was collected between 2017 and 2023 . Hoa Binh: 16 ♀♀, 24 ♂♂, Yen Thuy, Mai Chau , Luong Son, Kim Boi, and Da Bac districts; the material was collected between 2001 and 2024. Lao Cai : 2 ♂♂, about 30 km east of Lao Cai city, near Hanoi-Lao Cai highway, 21.ix.2017 . Yen Bai: 2 ♂♂, Yen Bai city, 14.ii.2015 , emerged from a nest; 4 ♀♀, 3 ♂♂, Sa Pa town , 19–21.ix.2017 . Ha Noi: 55 ♀♀, 55 ♂♂; Bac Tu Liem, Long Bien , Nam Tu Liem, Cau Giay, Gia Lam, Thach That, Chuong My, Ba Vi, and Soc Son districts; the material was collected between 2001 and 2024 . Hung Yen: 3 ♀♀, 5 ♂♂, Hai Trieu, Tien Lu, 25.vi.2013 . Soc Trang: 1 ♀, 1 ♂, My Tu, My Phuoc , 09°34'22.6"N, 105°45'13.7"E, 8.v.2018 , insect net. Quang Ngai: 1 ♀, 1 ♂, An Binh, Ly Son, 8.viii.2017 , insect net; 1 ♀, An Hai , Ly Son, 7.viii.2017 , insect net. Ninh Binh: 18 ♀♀, 23 ♂♂; Ninh Binh city, Gia Vien and Nho Quan districts; the material was collected between 2017 and 2024 ; 12 ♀♀, 6 ♂♂, Cuc Phuong National Park , 30.iv.2019 (VIE3) , 29.iv.2019 (VIE1) , 06.v.2019 (VIE4). Thai Binh: 27 ♀♀, 82 ♂♂; Hung Ha and Tien Hai districts, Thai Binh city; the material was collected between 2016 and 2022 . Thai Nguyen: 2 ♂♂, Phu Luong, 15.vii.2017 ; 2 ♀♀, Phu Thuong , Vo Nhai, 5.iii.2017 , nest. Thanh Hoa: 4 ♀♀, 7 ♂♂; Sam Son , Hoang Hoa, and Thach Thanh districts; the material was collected between 2016 and 2022 . Vinh Phuc: 3 ♀♀, 8 ♂♂, Me Linh Station for Biodiversity , Me Linh, 19.iv.2008, 19.v.2017, 3.vi.2018 , Malaise trap. Nam Dinh: 5 ♀♀, 7 ♂♂, Xuan Thuy National Park , Xuan Thuy, 11.v.2016, 22–25.vii.2024 . Dak Lak: 2 ♀♀, 2 ♂♂, Chu Yang Sin National Park , Krang Bang, 2.v.2016 . Kon Tum: 1 ♀, 1 ♂, Sa Thay town , Sa Thay, 3.iv.2014 ; 1 ♂, Chu Mon Ray National Park , Sa Thay, 2.iv.2014 . Nghe An: 6 ♀♀, 10 ♂♂; Cua Lo town , Con Cuong and Nam Dan Districts, the material was collected between 2017 and 2024. Ha Giang : 4 ♀♀, 2♂♂, Phong Quang , Vi Xuyen, 25.v.2022 ; 2 ♀♀, Bat Dai Son, Quan Ba, 17.vi.2023. Dien Bien: 1 ♂, Pa Thom , Dien Bien city, 2.iii.2023 . Quang Ninh: 3 ♀♀, 7 ♂♂; Tien Yen town, Uong Bi and Ha Long cities; the material was collected between 2013 and 2023 . Phu Tho: 2 ♀♀, 4 ♂♂, Thanh Son town , Thanh Son, Vi.2011 . Tay Ninh: 4 ♀♀, 2 ♂♂, Ninh Son, 28.v.–11.vi.2023 , Malaise traps; 3 ♀♀, 3 ♂♂, Duong Minh Chau , 11.vi.–3.vii.2023 , Malaise traps. Ha Tinh: 2 ♀♀, 2 ♂♂, Tram Co, Vu Quang National Park , 27.v.2024 ; 1 ♂, Ke Go lake , Cam Le, Cam Xuyen, 2.v.2019 . Hai Duong: 3 ♀♀, 6 ♂♂, Hien Thanh, Kinh Mon, 21.vii.2016 , emerged from collected nests. Cao Bang: 4 ♀♀, 1 ♂, Ngoc Dong , Ha Quang, 28.v.2022, 13.vi.2023 ; 1 ♀, Thanh Long , Ha Quang, 29.v.2022 .

Distribution. Vietnam: Sai Gon, Vung Tau ( Dollfuss 2016); Da Nang ( Tano & Kurokawa 2015); Bac Ninh, Dak Lak, Ha Noi, Hai Duong, Hoa Binh, Hung Yen, Kon Tum, Lao Cai, Nam Dinh, Nghe An, Ninh Binh, Phu Tho, Quang Ngai, Quang Ninh, Son La, Thai Binh, Thai Nguyen, Thanh Hoa, Vinh Phuc, Yen Bai ( Pham 2018; Pham et al. 2019); Cao Bang, Dien Bien, Ha Giang, Ha Tinh, Soc Trang, Tay Ninh (new records). Elsewhere: Australia, Bangladesh, China (including Hong Kong), Egypt, Eritrea, Ethiopia, French Polynesia, Greece, Guam Island, Hawaiian Island, India, Indonesia ( Ternate, Misool, Lesser Sunda islands), Iraq, Italy, Japan, Kenya, Kiribati (Gilbert island), Laos, Madagascar (Mascarenes, Seychelles islands), Malaysia, Maldives, Mauritius (Chagos Archipelago), Mozambique, Myanmar, Nepal, New Caledonia, Philippines, Phoenix island, Seychelles islands, Singapore, South Africa, Sri Lanka, Taiwan, Tanzania, Thailand, Timor, United State, Yemen ( Socotra island) ( Pulawski 2024).

Figures

FIGURES 1–6. Antenna and genitalia of male Chalybion bengalense (Dahlbom, 1845), ♂♂. 1. Antenna with placoids on flagellomeres 5–9; 2. Genitalia, in ventral view; 3. Genitalia, in dorsal view; 4. Antenna with placoids on flagellomeres 6–9; 5. Genitalia, in ventral view; 6. Genitalia, in dorsal view. Arrows show position of placoids.