The South American moth Rheumapteramochica (Dognin, 1904) (Lepidoptera, Geometridae, Larentiinae) rediscovered after more than a century of anonymity.

Rheumapteramochica (Dognin, 1904) (Lepidoptera, Geometridae, Larentiinae) is reported from Chile for the first time. It was described from the western slopes of the Andes of southern Peru more than 100 years ago, and was recently rediscovered in Chile after larvae were collected and reared on the shrub Sennabirostrisvar.arequipensis (Meyen ex Vogel) H.S. Irwin & Barneby (Fabaceae). This discovery expands the known distribution of this moth and provides its first host plant record. The genitalia of R.mochica are described and illustrated for the first time and compared to those of R.affirmata (Guenée, [1858]). A maximum likelihood analysis based on mitochondrial DNA sequences clustered R.mochica as sister to R.affirmata with 3.6-3.8% divergence (K2P). A lectotype is designated for Calocalpemochica Dognin, 1904.