Key to the Carabidae (Coleoptera) of The Evergreen State College campus

Key to the Carabidae of The Evergreen State College campus

Text for key taken from Lindroth (1961-1969). All micrographs taken by the author; line drawings with initials M.D. drawn by the author. Line drawings without initials taken from Lindroth 1961-1969. The text used in the genus and species accounts taken from Lindroth (1961-1969) and Kavanaugh (1992).

Matthew Denton, The Evergreen State College, Olympia, WA 98505 USA.

01 April 1997

10a The last segment of the maxillary palp is rudimentary, much shorter and narrower than the preceding. Bembidion

10b Last segment of maxillary palp well developed. 20

20a The body is pedunculate, the anterior part of mesothorax with extreme base of elytra strongly constricted, forming a peduncle on which the scutellum is situated. 30

20b Body not pedunculate, or if slightly so, the scutellum reaches the level of the shoulders and usually extends between the suture of the elytra. 40

30a Mandibles strongly protruding, upper surface without pronounced metallic lustre. Promecognathus

30b Mandibles less developed. Upper surface with pronounced metallic lustre. Zacotus

40a Each elytron with at least 11 well impressed striae, regular striae at least basally, and without ridges or tubercles. 50

40b Each elytron with less than 11 complete striae (abbreviated scutellar striae not counted) or rows of punctures, or irregularly sculptured, or smooth. 60

50a Head very narrow (less than half as wide as prothorax), and without suddenly constricted neck; mandibles with two sharp teeth near apex; antennal segments 2-4 with short setae; size variable. Scaphinotus

50b Head wider than half of prothorax; head with suddenly constricted neck; mandibles without teeth; antennal segments 2-4 with very long setae; less than 9 mm long. Loricera

60a Head with two setigerous supra-orbital punctures dorsomedially to each eye. 70

60b Head with one setigerous supra-orbital puncture dorsomedially to each eye. 120

70a Sutural stria of elytron "recurrent" at apex; size not above 6.5 mm Trechus

70b Sutural stria not recurrent; size is usually larger 80

80a Labrum asymmetrical and cleft almost to base; size 6.5mm or less. Badister

80b Labrum entire or with moderately emarginate anterior margin; size variable. 90

90a Elytra with two or more setigerous dorsal punctures on third interval. 95

90b Elytra with one or no setigerous dorsal punctures. 110

95a Face each side with pair of longitudinal grooves, joined by median impression (see figure below). Blethisa

95b Face without without this pattern of longitudinal grooves. 100

100a Claws denticulate or serrate; mentum without tooth. Calathus

100b Claws smooth; mentum with tooth Platynus

110a Penultimate segment of labial palp plurisetose; mandibles very short Amara

110b Penultimate segment of labial palp bisetose; mandibles longer and more pointed. Pterostichus

120a Elytra with irregular sculpture, consisting of foveae, ridges, confluent tubercles. 130

120b Each elytron with regular, striae, sometimes obliterated or interrupted or unequally spaced (rarely only sutural stria complete); intervals sometimes foveate but without ridges or tubercles. 150

130a Head very narrow; mandible with two sharp teeth internally 140

130b Head broader; mandible without teeth. Carabus

140a Labrum with 6 setae; tarsi pubescent dorsally. Scaphinotus

140b Labrum with 4 setae; tarsi glabrous above. Cychrus

150a Prothorax with long seta at hind angle; at least third or fourth elytral interval with two or more dorsal punctures. Nebria

150b Prothorax without seta at hind angle; elytra with one or no dorsal puncture on third interval. 160

160a Mandibles broadly explanate laterally; protibia without cleaning organ internally. Leistus

160b Mandibles not dilated; protibia with cleaning organ internally. 170

170a Penultimate segment of labial palp with many setae Harpalus

170b Penultimate segment of labial palp only with 2 (rarely 3) setae Bradycellus

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For information about this page: John T. Longino

Last modified: Blethisa added by J. Longino, 13 October 1998.