The Cryptorhynchinae is a large subfamily of weevils (Curculionidae

Curculionidae

Curculionidae is the family of the "true" weevils . It was formerly recognized in 1998 as the largest of any animal family, with over 40,000 species described worldwide at that time...

), with some 6000 species. They are merged into the Curculioninae

Curculioninae

The beetle subfamily Curculioninae is part of the weevil family Curculionidae. It contains over 23,500 described species in 2,200 genera, and is therefore the largest weevil subfamily known...

 or Molytinae

Molytinae

Molytinae is a subfamily of weevil described by Carl Johan Schönherr in 1823.Molytinae includes the following tribes:* Amalactini* Aminyopini* Amorphocerin* Anchonini* Cholini* Cleogonini* Conotrachelini* Cycloterini* Dinomorphini* Euderini...

 in some treatments.

They are distinguished by having their rostrum

Rostrum (anatomy)

The term rostrum is used for a number of unrelated structures in different groups of animals:*In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes....

 (snout) backwardly directed between their fore coxae

Arthropod leg

The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments are of Latin origin, and may be confused with terms for bones: coxa , trochanter , femur, tibia, tarsus, ischium, metatarsus, carpus, dactylus ,...

 in repose, and fitting within a protective channel that usually ends in a cup-like structure on the mesosternum (ventral mid thoracic segment). The ends of the tibiae

Arthropod leg

The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. Many of the terms used for arthropod leg segments are of Latin origin, and may be confused with terms for bones: coxa , trochanter , femur, tibia, tarsus, ischium, metatarsus, carpus, dactylus ,...

also bear an uncus (small hook-like extensions).