Haustrum is the original Latin word for "haustellum" indicating the presence of this character in the holotype.
The holotype is a well preserved specimen with two forewings and a partial hind wing, thorax, head, some antennomeres, some leg segments, maxillary and labial palps, and the haustellum. Pronotum is small and heavily sclerotized.
The haustellum (= proboscis) is usually reduced or absent, and labial palps often appear truncate at the apex because the small apical segment is reflexed, relative to the long penultimate segment, and is often obscured by scales.
ceres also has a haustellum, although only in females.