Postelichus, NELSON AND A BRIEF REVIEW, 1989

Barr, Cheryl B. & Shepard, William D., 2022, Description of Postelichus bajaensis, New Species (Coleoptera: Dryopidae), with a Key to the Known Species of Postelichus Nelson and a Brief Review of the Dryopidae Occurring on the Baja California Peninsula, Mexico, The Coleopterists Bulletin 76 (4), pp. 513-527 : 524

KEY TO THE SPECIES OF POSTELICHUS BASED ON MALE GENITALIA

1. Aedeagus relatively slender; penis apex ending well short of paramere apices ( Fig. 9 ); w TX, NM, AZ, n MX........ P. CONfLUENTUS (Hinton)

1′. Aedeagus relatively stout; penis apex ending near paramere apices .....................................2

2. Paramere in dorsal ( Figs. 2a , 11a , 13a ) or lateral view ( Fig. 10b ) abruptly expanded at apical 1/4–1/3 ...........................................................3

2′. Paramere in dorsal or lateral view ( Figs. 12 , 14 ) not abruptly expanded at apical 1/4–1/3 ....... 4

3. Paramere with expanded tip projecting dorsally in lateral view ( Fig. 10b ); w TX to c CA, n BC, c MX............................... P. ImmSI (Hinton)

3′. Paramere with expanded tip projecting medially in dorsal view ( Figs. 2a , 11a , 13a ) .................5

4. Penis apex broadly rounded ( Figs. 12a, c ); c CA to n BC ..................... P. prOdUCTUS (LeConte)

4′. Penis apex slightly produced to form a small, blunt point ( Fig. 14a ); c MX.………………… ……………………… P. THOrACICUS (Hinton)

5. Parameres in dorsal view together widest at middle between lateral margins; lateral margins moderately to strongly arcuate ( Fig. 2a ); BC, BCS …… P.BAJAENSIS Barr and Shepard, new species

5′. Parameres in dorsal view together widest at base; lateral margins nearly straight to weakly arcuate ………………………………………6

6. Penis apex blunt; paramere tips elongate in dorsal view, with straight inner margins ( Fig. 11a ); c MX ………………… P. mUSgrAvEI (Hinton)

6′. Penis apex acute; paramere tips not elongate in dorsal view, with curved inner margins ( Fig. 13a ); s BCS………… P. prOpINqUUS (Hinton)

Figures

Figs. 9–10. Male genitalia. 9) Postelichus confluentus from Montezuma Well, irrigation canal, Yavapai Co., AZ, USA, a) Dorsal view, b) Left lateral view, c) Ventral view; 10) P.immsi from Del Puerto Creek, Stanislaus Co., CA, USA, a) Dorsal view, b) Left lateral view, c) Ventral view.

Figs. 1–2. Postelichus bajaensis, new species, male. 1) Habitus, size 6.9 mm long, 2.8 mm wide (excluding head), a) Dorsal view, b) Ventral view; 2) Genitalia, a) Dorsal view, b) Left lateral view, c) Ventral view.

Figs. 11–12. Male genitalia. 11) Postelichus musgravei from Temescaltepec, Mexico, MX, a) Dorsal view, b) Left lateral view, c) Ventral view; 12) P.productus from Middle and South Forks Stony Creek, Colusa Co., CA, USA, a) Dorsal view, b) Left lateral view, c) Ventral view.

Figs. 13–14. Male genitalia. 13) Postelichus propinquus from Boca de la Sierra, BCS, MX, a) Dorsal view, b) Left lateral view, c) Ventral view; 14) P. thoracicus from Rio Victoria, Querétaro, MX, a) Dorsal view, b) Left lateral view, c) Ventral view.