Heteragrion erythrogastrum Selys, 1886

(Figs. 32a–d)

[Key locator: Key to Group B species, couplet 9 (8)]

Heteragrion erythrogastrum: Selys 1886: 61–62 (description of ♁ and ♀ from Panama);— Calvert 1901: 62, 65 (recorded in Costa Rica and Panama);— Calvert 1907: 357 (recorded in Costa Rica and Panama);— Ris 1918: 88 (synonymic list; figs. 41–42);— Williamson 1919: 30–32 (key to species, ♁ in couplet c1, ♀ in couplet d1; remarks and comparison with H. chrysops and H. mitratum; figs. 1, 30–31, 58, 64, 71, 84–85, 125–126, 146– 147);— Paulson 1981: 304 (comparison of coloration patterns with other Heteragrion species);— Ramírez 1992: 361–365 (description and discussion on larval habitats and comparison with other known larvae to Costa Rica);— Ramírez et al. 2000: 247–254 (listed among species found in Costa Rica);— Hartung 2002: 191 (comparison with H. palmichale);— Pérez-Gutiérrez et al. 2007: 183–199 (list of species from Chocó, Colombia);— Garrison et al, 2010: 88 (list of Heteragrion species);— Garrison & von Ellenrieder 2013: 14, 23 (list of species from Costa Rica; fig. 18);— Molinar et al. 2015: 87 (list of species from Panama);— Bota-Sierra & Novelo-Gutiérrez 2017: 555–556, 562 (key to species, ♁ in couplet 1, ♀ in couplet 5’; remarks about ecological preferences; figs. 1, 4j, 8a);— Stand-Pérez et al. 2019: 92–93, 103–104 (key to species, ♁ in couplet 1, ♀ in couplet 12’; remarks on coloration and differences with other species; figs. 5e–f, 9d–f, 14a–c, 18).

Material examined. 1♁ COLOMBIA, Chocó Department, N. Donnelly leg., no further information, ABMM; 21♁♁ Chocó Department, Unión Panamericana Municipality, Corregimiento Salero, 24.vii.2010, (6.6108, -74.5771, 100m asl), L. Pérez & J. Montes leg., UARC ; 2♁♁ Acandí Municipality, Vereda Rufino, Quebrada Capitancito, 10.XII.2005, (8.5787, -77.3108, 30m asl), C. Botero leg., UARC ; 1♁ Tutunendo Municipality, Quebrada El Diablo, (5.7513, -76.5331, 71m ASL), L. Pérez leg., UARC ; 1♁ Boyacá Department, Puerto Boyacá Municipality, Vereda Patio Bonito, 5.i.2011, J. Cardona leg., CEUA ; 1♁ Valle del Cauca Department, Buenaventura Municipality, Uramba Bahía Málaga National Park, C. Bota leg., CEUA ; 10♁♁ Chocó Department, Union Panamericana Municipality, Corregimiento Salero, 24.vii.2010, (6.6108, -74.5771, 100m asl), L. Pérez & J. Montes leg., ANDES-E ; 32♁♁ Acandí Municipality, Vereda Rufino, Quebrada Capitancito, 10.xii.2005, (8.5787, -77.3109, 30m asl), ANDES-E ; 35♁♁ Quebrada Charanga, (8.5906, 77.3158, 27m asl), ANDES-E ; 4♁♁ Quebrada Bocatoma, (8.5874, -77.3108, 50m asl), ANDES-E ; 7♁♁ Quebrada Tomas, (8.5691, -77.3232, 34m asl), ANDES-E ; 1♁ Quibdó Municipality, Quebrada Chaparraidó COO., ANDES-E; 4♁♁ Chocó Department, Acandí Municipality, MPUJ .

Known distribution. Colombia, Costa Rica, Ecuador, Honduras, Nicaragua and Panama.

Diagnosis and remarks. Remarkable and common species, males of H. erythrogastrum (as the name implies) possess a vibrant red abdomen, an almost unique feature within Heteragrion ( H. albifrons comes close) that distinguishes this species from the other species of both groups. Additionally, the following character combination separates it from the remainder of Group B species: ridge above ML consisting of two rows of small teeth, the lower very weak (Figs. 32c–d).