| simulium horacioi | | Costa Rica: Alajuela, Rd from S. Jose to Poas Volcano to Poacito, Rio Poacito | | 820958013 |
| simulium horacioi | | Costa Rica: Alajuela, Rd from S. Jose to Poas Volcano to Poacito, Rio Poacito | | 820958275 |
| simulium horacioi | | Costa Rica: Alajuela, Rd from Vara Blanca to Cariblanco, Second unnamed stream | | 820958455 |
| simulium horacioi | | Costa Rica: Alajuela, Rd from S. Jose to Poas Volcano to Poacito, Rio Poacito | | 820958811 |
| simulium horacioi | | Costa Rica: Alajuela, Rd from S. Jose to Poas Volcano to Poacito, Rio Poacito | | 820959179 |