Geographic Coverage

Broad geographic regions in which the species have been observed, based on published records, are indicated by two-letter codes in brackets following the valid species names. These codes and their areas are indicated on the accompanying map of North America:

• FN=far north (above the 60th parallel)
• FS=far south (below the Tropic of Cancer)
• NE=northeast
• NW=northwest
• SE=southeast
• SW=southwest

See Species List for usage examples. In addition actual countries of distribution are also given:

• CAN=Canada
• MEX=Mexico
• USA=United States

As an example, USA:FN indicates an Alaskan distribution whereas MEX:SW indicates a northern Mexican distribution. Only FS and SE are unique to one country (FS to Mexico, SE to the United States).