Beetle Dichotomous Key
Antennas are not straight or do not point away from in front of the beetle's head
Antennas are not longer or roughly equal in length to forelegs
Prothorax is not about as long vertically as it is horizontally
Abdomen has striped pattern horizontally
Cucumber snout beetle
Abdomen does not have striped pattern horizontally
Apricot borer
Prothorax is about as long vertically as it is horizontally
Abdomen is not completely black
Crawling water beetle
Abdomen is completely black
False wireworm beetle
Antennas are longer or roughly equal in length to forelegs
Mandibles clearly protrude
Prothorax is not as wide as abdomen
Water tiger
Prothorax is as wide as abdomen
Broad-horned flour beetle
Mandibles do not clearly protrude
Has three body segments
Red flour beetle
Does not have three body segments
Drug store beetle
Antennas are straight or point away from the front of the beetle's head
Antennas are not longer or roughly equal in length to forelegs
Forelegs are longer in length than hindlegs
Abdomen is black
Whirligig beetle
Abdomen is not black
Variegated mud-loving beetle
Forelegs are not longer in length than hindlegs
End of abdomen is rounded
Blind ant-beetle
End of abdomen is not rounded
Prothorax is as wide as abdomen
Iron clad beetle
Prothorax is not as wide as abdomen
Flathead apple borer
Antennas are longer or roughly equal in length to forelegs
Forelegs are longer or equal in length to hindlegs
Abdomen has white marks
White-marked spider beetle
Abdomen does not have white marks
Prothorax is wider than head
Mycetaeid beetle
Prothorax is not wider than head
Monterey cyprus beetle
Forelegs are not longer or equal in length to hindlegs
Tip of head is rounded
Predaceous diving beetle
Tip of head is not rounded
Red-necked cane borer