Myrmosicarius biarticulatus

Distribution
Brazil

Biology
Host ant: Labidus praedator

Description
Female. Body length 1.5–2.0 mm. Body color brown. Frons with 4-4-4 short frontal setae; ventral interfrontal setae arise nearer to eye margin than midline, strongly medioclinate. Flagellomere 1 rounded-oval, laterally flattened. Palpus extremely short, brown, proboscis long, narrow; labella twice as long as labrum. Thorax with three notopleural setae. Legs with fore- and midtarsomere 5 elongate, narrowed, with claws reduced. Tarsomere 5 of hind leg not apically narrowed. Hind tibia with single dorsal setal palisade and posterodorsal row of small setae, most apical seta much larger. Costa 0.30–0.35 wing length. Vein R2+3 present. Halter brown. Posterior margin of abdominal tergites with minute setae only. Oviscape only slightly sinuous, with bluntly rounded apex.