Haliplus Latreille, 1802

Majka, Christopher, van Vondel, Bernhard & Webster, Reginald, 2009, The Haliplidae (Coleoptera) of Atlantic Canada: new records, distribution, and faunal composition, ZooKeys 22 (22), pp. 249-266 : 252-253

Key C: Haliplus Latreille

1 Metatibia with a longitudinal setigerous striole on dorsal face – subgenus Liaphlus Guignot ........................................................................................ 9

– Metatibia without longitudinal setigerous striole on dorsal face .................. 2

2(1) Base of pronotum with a short longitudinal plica – subgenus Haliplus Latreille .......................................................................................................... 3

– Pronotum without basal longitudinal plica – subgenus Paraliaphus Wallis.... 6

3(2) Apicies of elytra strongly sinuate [3.0 mm] ................................................... ................................. Haliplus blanchardi (Roberts) – recorded in Québec

– Apicies of elytra not strongly sinuate; rounded or almost subtruncate and feebly sinuate .............................................................................................. 4

4(3) Basal pronotal plica less than 1/4 the length, measured from base of plica along plica, to anterior margin of pronotum; prosternal process deeply channeled longitudinally; elytra with six black spots in a half ellipse enclosing a common sutural spot; in some, spots almost completely absent [2.5 – 3.0 mm]........................................... Haliplus immaculicollis Harris

– Basal pronotal plica more than 1/4 the length, measured from base of plica along plica, to anterior margin of pronotum; prosternal process not or feebly channeled longitudinally; elytra without, or with indistinct, spots .............. 5

5(4) Left paramere of male with hairs sparsely placed along nearly the entire ventral side; adeagus evenly curved, not narrowed apically [2.8–3.1 mm] ........... .................................................. Haliplus falli Mank – recorded in Québec

– Left paramere of male with hairs confined to apical third of the ventral side; adeagus elongate, narrowed apically [2.7–3.0 mm]........................................ ......................................................................... Haliplus longulus LeConte

6(2) Elytral apices strongly sinuate; penultimate labial palpomere dilated inward forming prominent angle [2.5–3.0 mm]............. Haliplus borealis LeConte

– Elytral apicies at most feebly sinuate; penultimate labial palpomere not dilated............................................................................................................ 7

7(6) Meso-trochanters with deep, coarse punctures [4.0 – 4.2 mm]........................ ......................................................................... Haliplus leopardus Roberts

– Meso-trochanters without or with few punctures........................................ 8

8(7) Tarsal claws short; aedeagus abruptly bent down in apical fifth [3.0–4.0 mm] ........................................... Haliplus triopsis Say – recorded in Maine

– Tarsal claws long; aedeagus almost evenly curved from base to apex [3.5– 4.0 mm] .................................................... Haliplus pantherinus Aubé

9(1) Prosternal ridge and metasternal process margined at sides ....................... 10

– Prosternal ridge and metasternal process not margined at sides ................. 12

10(9) Pronotum with dark mark on anterior margin [4.1 mm] .............................. ......................................................................... Haliplus apostolicus Wallis

– Pronotum without dark mark on anterior margin..................................... 11

11(10) Apicies of elytra distinctly denticulate; sutural stripe narrow, not extending to sutural striae [4.0 mm].................................. Haliplus connexus Matheson

– Apicies of elytra little, if at all, denticulate; sutural stripe broad, extending to sutural striae [4.0– 4.5 mm] ..................................... Haliplus fasciatus Aubé

12(9) Middle of metasternum deeply depressed behind metacoxae..................... 13

– Middle of metasternum at the same level behind as between metacoxae [3.8 – 4.2 mm]................................................. Haliplus fulvus (Fabricius)

13(12) Length greater than 4.5 mm; punctation of elytral striae coarse [4.5–5.0 mm]............................................................... Haliplus cribrarius LeConte

– Length less than 3.8 mm; punctation of elytral striae finer [3.8 mm]............ .......................................................................... Haliplus canadensis Wallis