Identify Adult Male Black chinned Hummingbirds

Small, compact, between 3.25-3.75", with long straight thin bill.  Dull green to emerald green on back.  Head, chin, and gorget is velvet black unless the light hits just right, and then a band of metalic purple on the throat marks this little male as a black chinned hummingbird. At times this band of purple on the throat can also appear to be gray, blue or even amethyst violet. Chin area is always black and this is why this little hummer is named Black chinned.  White color on neck contrasts with black head and chin.  Green sides on breast, give a vested appearance.  Lower sides show some rufous, tan, or buffish color. Tail projects slightly past wingtips. Pumps tail frequently when hovering.  Tail is deeply notched with pointed black tail feathers tipped with dull bronzy green.