| Idaea umbricosta (Prout L.B., 1913) | Eswatini |  | page TMSA |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | Kenya |  | Prout L. B. 1916a. New South African Geometridae. page 164 (as depleticosta) |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | Malawi |  | Fletcher D. S. 1978a. Geometridae (Lepidoptera) collected by Dr. J. Szunyoghy in Tanzania. page 61 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | South Africa | Free State | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | South Africa | Western Cape | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | South Africa | Limpopo | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | South Africa | Mpumalanga | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | South Africa | Gauteng | Prout L. B. 1913b. New South African Geometridae. page 201 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | Tanzania |  | Prout L. B. 1932a. Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale (1911–1912). Insectes Lépidoptères. III. Geometridae. page 412 |  | 
              
              
                  | Idaea umbricosta (Prout L.B., 1913) | Zimbabwe |  | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
              
              
                  
              
                  
                  
                      | Idaea umbricosta depleticosta (Prout L. B., 1916) | Kenya |  | Prout L. B. 1916a. New South African Geometridae. page 164 |  | 
                  
                  
                      | Idaea umbricosta depleticosta (Prout L. B., 1916) | Tanzania |  | Prout L. B. 1932a. Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale (1911–1912). Insectes Lépidoptères. III. Geometridae. page 412 |  | 
                  
              
                  
              
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | Eswatini |  | page TMSA |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | Malawi |  | Fletcher D. S. 1978a. Geometridae (Lepidoptera) collected by Dr. J. Szunyoghy in Tanzania. page 61 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | South Africa | Limpopo | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | South Africa | Mpumalanga | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | South Africa | Gauteng | Prout L. B. 1932a. Voyage de Ch. Alluaud et R. Jeannel en Afrique Orientale (1911–1912). Insectes Lépidoptères. III. Geometridae. page 412 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | South Africa | Western Cape | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | South Africa | Free State | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  | 
                  
                  
                      | Idaea umbricosta umbricosta (Prout L.B., 1913) | Zimbabwe |  | Janse A. J. T. 1933–1935. The Moths of South Africa. Volume II. Geometridae (concluded). page 241 |  |