Argia sp. C Coenagrionidae

Male identification:

  • Raised bumps in front of antennae covered by blue.
  • Mesepimeron and sides of S2 all black or with only a small blue spot.
  • Blue triangles on dorsum of S3-4. S5-6 black with only a basal blue ring.
  • Wings remain clear in older individuals.

Female identification:

  • Pale area on back of head bordering eye is U-shaped with ends departing from margin.
  • Antehumeral stripe brown, not blue.
  • Black stripe on metapleural suture.
  • Underside of thorax with large black mark.
  • In profile, mesostigmal tubercles taller than rear lobe of prothorax.
  • Lower side of S9 with blue area below central black stripe.

Size: Medium

Body length: 35.0-37.0

Local distribution: Pacific lowlands to 300 m.

Habitat: Small streams in forest.

Species range in Middle America: Costa Rica

Updated: 22 November 2011

Credits: Text and images copyright by William A. Haber, 2006-2011. Contact: