Description of the last larval instar of Aeshna (Marmaraeschna) pallipes Fraser, 1947 (Anisoptera: Aeshnidae)

The last larval instar is described and illustrated, based on reared specimens from Argentina (Salta and La Rioja provinces). It differs from the only other Marmaraeschna larva known, A. (M.) brevicercia, by the antennae surpassing anterior margin of labrum, lateral spine of abdominal segment IX as long as segment X, and <J basal lamina of epiproct with rounded tip and half as long as epiproct. Both pallipes and brevicercia larvae differ from other Aeshna larvae by the U-shaped apical excision of epiproct and the marginal tubercles on sides of ligula medial cleft.