diff --git a/pandas/_libs/lib.pyx b/pandas/_libs/lib.pyx
index bc2886e5b531c..80592d4f67c98 100644
--- a/pandas/_libs/lib.pyx
+++ b/pandas/_libs/lib.pyx
@@ -1192,9 +1192,12 @@ _TYPE_MAP = {
     "u": "integer",
     "float32": "floating",
     "float64": "floating",
+    "float128": "floating",
+    "float256": "floating",
     "f": "floating",
     "complex64": "complex",
     "complex128": "complex",
+    "complex256": "complex",
     "c": "complex",
     "string": "string",
     str: "string",
@@ -1216,23 +1219,6 @@ _TYPE_MAP = {
     bytes: "bytes",
 }
 
-# types only exist on certain platform
-try:
-    np.float128
-    _TYPE_MAP["float128"] = "floating"
-except AttributeError:
-    pass
-try:
-    np.complex256
-    _TYPE_MAP["complex256"] = "complex"
-except AttributeError:
-    pass
-try:
-    np.float16
-    _TYPE_MAP["float16"] = "floating"
-except AttributeError:
-    pass
-
 
 @cython.internal
 cdef class Seen:
diff --git a/pandas/tests/series/indexing/test_setitem.py b/pandas/tests/series/indexing/test_setitem.py
index 6b0ff2d3e3704..e87a968dee323 100644
--- a/pandas/tests/series/indexing/test_setitem.py
+++ b/pandas/tests/series/indexing/test_setitem.py
@@ -688,11 +688,7 @@ def is_inplace(self, obj, expected):
         """
         Whether we expect the setting to be in-place or not.
         """
-        try:
-            return expected.dtype == obj.dtype
-        except TypeError:
-            # older numpys
-            return False
+        return expected.dtype == obj.dtype
 
     def check_indexer(self, obj, key, expected, val, indexer, is_inplace):
         orig = obj