Bystus Guérin-Méneville, 1857 : 270

Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta & Navarrete-Heredia, José Luis, 2007, A synopsis of the Endomychidae (Coleoptera: Cucujoidea) of México, Zootaxa 1594, pp. 1-38 : 5-7

Bystus Guérin-Méneville, 1857: 270 .

Type species: Bystus coccinelloides Guérin-Méneville, 1857 . Rhymbus Gerstaecker, 1858: 347 .

This is a tropical genus distributed in the western hemisphere. In México species of Bystus are known from the Gulf and Southeastern areas and have been collected from rotting logs and logs infested by hard bracket fungi. Hoffman et al. (2004) mentioned the occurrence of an unidentified species (as Rhymbus ) in a cave from Yucatan Peninsula. Leschen & Carlton (1993) described B. decorator from Perú, detailing an interesting behavior of larvae which cloak themselves with debris collected from the surrounding microhabitat, probably for protection from predators. Four species recorded from México.

2. B. apicalis ( Gerstaecker, 1858) .

Rhymbus apicalis Gerstaecker, 1858: 350 ; Gorham 1890: 143; Blackwelder 1945: 440. Bystus apicalis: Strohecker 1953: 21 .

Type locality: Colombia

Type material: syntypes in MNHUB, BMNH

Distribution: México (without specific records on the distribution), Guatemala, Colombia.

3. B. fibulatus (Gorham, 1890) .

Rhymbus fibulatus Gorham, 1890: 144 ; Blackwelder 1945: 440. Bystus fibulatus: Strohecker 1953: 21 .

Type locality: México: VER, Túxpan Type material: syntypes in BMNH. Distribution: México: VER.

4. B. hemisphaericus ( Gerstaecker, 1858) .

Rhymbus hemisphaericus Gerstaecker, 1858: 349 ; Gorham 1890: 143; Blackwelder 1945: 440. Bystus hemisphaericus: Strohecker 1953: 21 .

Type locality: Costa Rica.

Type material: holotype in MNHUB

Distribution: México: VER, GRO; Belize, Guatemala, Costa Rica, Panamá.

5. B. limbatus (Gorham, 1873) . Figs 3 , 15 .

Rhymbus limbatus Gorham, 1873: 63 ; Gorham 1890: 142; Blackwelder 1945: 440; Strohecker 1953: 22.

Figures

FIGURES 3 – 8. Distribution maps. 3, Bystus limbatus (Gorham). 4, Archipines intricata (Gorham). 5, Corynomalus perforatus Gerstaecker. 6, Stenotarsus latipes Arrow. 7, Stenotarsus marginalis Arrow. 8, Stenotarsus rubrocinctus Gerstaecker. Shading indicates state record (s) only.

FIGURES 15 – 18. Endomychidae species recorded from México. 15, Bystus limbatus (Gorham) (3.3 mm). 16, Catapotia laevissima Thomson (3.1 mm). 17, Exysma laevigata Gorham (1.7 mm). 18, Rhymbomicrus hemisphaericuss (Champion) (1.0 mm).