Collection Summary
Heterodon platirhinos (Eastern Hog-nosed Snake) has a total of 272 valid, non-duplicated collections representing 85 counties and 223 localities. There are a total of 84 collectors and 191 collection dates for the species. This results in a total of 202 expeditions for the species, a measure of unique date / collector(s) combinations. The earliest collection year for the species in Missouri is 1889 and its most recent collection year is 2018. The earliest and latest collection dates (independent of earliest and most recent collection years) are February 1 and November 3, respectively. If you have a new record to report, read the New Records section of the FAQ.
Collection Summary by County
| County | Localities | Collections | Collectors | Dates | Expeditions | Earliest Year | Latest Year | |
|---|---|---|---|---|---|---|---|---|
 | Adair | 4 | 4 | 3 | 4 | 4 | 1960 | 2009 |
| Barry | 2 | 3 | 6 | 3 | 3 | 1930 | 2005 |
| Benton | 2 | 2 | 1 | 2 | 2 | 2008 | 2013 |
| Bollinger | 4 | 5 | 5 | 5 | 5 | 1937 | 1967 |
| Boone | 9 | 13 | 7 | 13 | 13 | 1923 | 2014 |
| Buchanan | 1 | 1 | 1 | 1 | 1 | 2009 | 2009 |
| Butler | 4 | 4 | 3 | 4 | 4 | 1958 | 1995 |
| Callaway | 4 | 4 | 1 | 4 | 4 | 1997 | 2013 |
| Camden | 3 | 3 | 2 | 3 | 3 | 1964 | 2002 |
| Cape Girardeau | 1 | 1 | 1 | 1 | 1 | 1996 | 1996 |
| Carroll | 1 | 1 | 1 | 1 | 1 | 1944 | 1944 |
| Carter | 1 | 1 | 2 | 1 | 1 | 1981 | 1981 |
| Cass | 1 | 1 | 1 | 1 | 1 | 1990 | 1990 |
| Cedar | 1 | 1 | 5 | 1 | 1 | 1998 | 1998 |
| Chariton | 1 | 1 | 1 | 1 | 1 | 1938 | 1938 |
| Christian | 1 | 1 | 1 | 1 | 1 | 1967 | 1967 |
| Clark | 2 | 2 | 2 | 2 | 2 | 1979 | 2011 |
| Clay | 1 | 1 | 1 | 1 | 1 | 1962 | 1962 |
| Clinton | 1 | 1 | 1 | 1 | 1 | 1998 | 1998 |
| Cole | 1 | 1 | 1 | 1 | 1 | 2004 | 2004 |
| Cooper | 1 | 1 | 1 | 1 | 1 | 1966 | 1966 |
| Crawford | 1 | 2 | 2 | 2 | 2 | 1902 | 1902 |
| Dade | 1 | 1 | 1 | 1 | 1 | 2000 | 2000 |
| Dallas | 3 | 3 | 3 | 3 | 3 | 1941 | 2016 |
| Daviess | 1 | 1 | 1 | 1 | 1 | 1940 | 1940 |
| De Kalb | 1 | 1 | 1 | 1 | 1 | 1989 | 1989 |
| Dent | 2 | 2 | 2 | 2 | 2 | 1909 | 1909 |
| Dunklin | 3 | 3 | 1 | 2 | 2 | 1962 | 1962 |
| Franklin | 5 | 5 | 5 | 5 | 5 | 1927 | 1965 |
| Gasconade | 2 | 3 | 2 | 2 | 2 | 1973 | 1973 |
| Greene | 3 | 3 | 1 | 3 | 3 | 2000 | 2009 |
| Grundy | 1 | 4 | 1 | 3 | 3 | 1963 | 1964 |
| Hickory | 1 | 1 | 1 | 1 | 1 | 1964 | 1964 |
| Howard | 5 | 6 | 3 | 4 | 4 | 1997 | 2011 |
| Howell | 1 | 2 | 2 | 2 | 2 | 1906 | 1906 |
| Iron | 3 | 3 | 3 | 3 | 3 | 1972 | 2003 |
| Jackson | 23 | 29 | 5 | 20 | 22 | 1908 | 2001 |
| Jefferson | 5 | 6 | 2 | 2 | 2 | 1905 | 1905 |
| Johnson | 9 | 12 | 5 | 6 | 6 | 1939 | 1995 |
| Knox | 1 | 1 | 1 | 1 | 1 | 2004 | 2004 |
| Laclede | 2 | 2 | 2 | 2 | 2 | 1962 | 1964 |
| Lewis | 2 | 2 | 2 | 2 | 2 | 1940 | 1940 |
| Lincoln | 3 | 5 | 1 | 5 | 5 | 1978 | 2012 |
| Livingston | 1 | 1 | 1 | 1 | 1 | 1938 | 1938 |
| Macon | 2 | 2 | 2 | 2 | 2 | 1983 | 1997 |
| Madison | 1 | 1 | 1 | 1 | 1 | 2018 | 2018 |
| Maries | 2 | 2 | 2 | 2 | 2 | 2015 | 2015 |
| Marion | 2 | 2 | 2 | 2 | 2 | 2002 | 2009 |
| McDonald | 1 | 2 | 1 | 1 | 1 | 1930 | 1930 |
| Miller | 2 | 2 | 2 | 2 | 2 | 1953 | 2018 |
| Mississippi | 1 | 1 | 1 | 1 | 1 | 1962 | 1962 |
| Monroe | 2 | 2 | 3 | 2 | 2 | 2002 | 2013 |
| Montgomery | 4 | 5 | 4 | 4 | 4 | 1905 | 2004 |
| Morgan | 3 | 5 | 2 | 4 | 4 | 1948 | 1967 |
| New Madrid | 1 | 1 | 1 | 1 | 1 | 1956 | 1956 |
| Oregon | 3 | 3 | 4 | 3 | 3 | 1956 | 2006 |
| Ozark | 2 | 2 | 2 | 2 | 2 | 1973 | 1976 |
| Pemiscot | 1 | 1 | 1 | 1 | 1 | 1961 | 1961 |
| Perry | 3 | 3 | 3 | 2 | 3 | 1923 | 2010 |
| Pettis | 2 | 2 | 3 | 2 | 2 | 1941 | 1976 |
| Phelps | 3 | 3 | 3 | 3 | 3 | 1982 | 2000 |
| Pike | 2 | 2 | 2 | 2 | 2 | 1996 | 1996 |
| Polk | 1 | 1 | 1 | 1 | 1 | 2012 | 2012 |
| Pulaski | 2 | 2 | 2 | 2 | 2 | 1954 | 2010 |
| Ralls | 2 | 2 | 2 | 2 | 2 | 1982 | 2012 |
| Randolph | 4 | 4 | 3 | 4 | 4 | 2001 | 2004 |
| Ray | 1 | 1 | 1 | 1 | 1 | 1965 | 1965 |
| Reynolds | 3 | 3 | 2 | 2 | 2 | 1992 | 2003 |
| Saint Charles | 3 | 7 | 2 | 5 | 5 | 1889 | 1985 |
| Saint Clair | 4 | 5 | 2 | 4 | 4 | 1938 | 1939 |
| Sainte Genevieve | 1 | 1 | 1 | 1 | 1 | 2015 | 2015 |
| Saint Francois | 2 | 4 | 3 | 3 | 3 | 1900 | 1934 |
| Saint Louis | 5 | 8 | 5 | 5 | 6 | 1890 | 2010 |
| Scott | 2 | 3 | 1 | 1 | 1 | 1938 | 1938 |
| Shannon | 4 | 4 | 5 | 4 | 4 | 1962 | 2008 |
| Stoddard | 3 | 4 | 4 | 4 | 4 | 1938 | 1979 |
| Stone | 1 | 2 | 1 | 2 | 2 | 1950 | 1950 |
| Taney | 6 | 7 | 7 | 6 | 6 | 1969 | 2011 |
| Texas | 3 | 3 | 3 | 3 | 3 | 2003 | 2007 |
| Vernon | 1 | 1 | 1 | 1 | 1 | 1936 | 1936 |
| Warren | 2 | 2 | 3 | 2 | 2 | 2013 | 2013 |
| Washington | 2 | 3 | 1 | 2 | 2 | 1909 | 1909 |
| Wayne | 6 | 9 | 6 | 6 | 7 | 1934 | 2005 |
| Worth | 1 | 1 | 1 | 1 | 1 | 2002 | 2002 |
| Wright | 1 | 2 | 1 | 2 | 2 | 1932 | 1932 |