HYDROPHILIDAE, Latreille, 1802

Ferro, Michael L., Nguyen, Nhu H., Tishechkin, Alexey, Park, Jong-Seok, Bayless, Victoria & Carlton, Christopher E., 2013, Coleoptera Collected from Rotting Fishhook Barrel Cacti (Ferocactus wislizeni (Engelm.) Britton and Rose), with a Review of Nearctic Coleoptera Associated with Succulent Necrosis, The Coleopterists Bulletin 67 (4), pp. 419-443 : 428-429

HYDROPHILIDAE

Sphaeridiinae

Agna capillata (LeConte) ( Fig. 12 )

Comments. Agna Smetana contains two species, only A. capillata is reported from the USA.

Range. Arizona, California, Texas ( Smetana 1978).

Habitat. In decomposing saguaro ( Hubbard 1899, as Pelosoma capillosum ); scavenger in cactus ( Hunter et al. 1912, as Pelosoma capillosum ); in decaying agave ( Smetana 1978).

Biology. Comes to light ( Smetana 1978), otherwise unknown, immatures of Agna unknown.

Additional References. Fall and Cockerell 1907 (as Pelosoma capillatum ); Griffith 1900 (as Cercyon capillatum ); Hansen 1991 (key to genus), 1999; Henshaw 1885 (as Cercyon capillatum ); Horn 1890 (as Pelosoma capillatum ); LeConte 1855, 1858a (as Cercyon capillatum ); Leech 1948 (describes but does not formally name a species “ Pelosoma sp. near capillatum ”, Ales Smetana (personal communication) did not review those specimens in his revision of the group ( Smetana 1978), they may now be lost); Leng 1920 (as Pelosoma capillatum ); Moore 1937 (as Pelosoma capillatum ); Van Tassell 2001 (key to genus/species).

Dactylosternum cacti (LeConte) ( Fig. 13 )

Comments. Dactylosternum Wollaston has a worldwide distribution with 62 recognized species ( Hansen 1999), three in North America north of Mexico ( Smetana 1978).

Range. Arizona, southern California ( Horn 1890; Smetana 1978).

Habitat. Decomposing Cereus sp. ( Horn 1890; Fall 1901); moist part of dead saguaro ( Hubbard 1899); putrid Opuntia (LeConte 1855, as Cyclonotum cacti ); scavenger in cactus ( Hunter et al. 1912); rotting Pachycereus sp. , rotting cordon ( Leech 1948).

Biology. Unknown. Costa et al. (1988) described the immature of Dactylosternum subrotundum (F.) and reported adults and larvae from wellrotted and wet fallen logs.

Additional References. Blackwelder 1931 (key to genus and species for Pacific Coast); Crotch 1873 (as Cyclonotum cacti ); Fall and Cockerell 1907; Griffith 1900; Hansen 1991 (key to genus), 1999; Horn 1890 (key to species); LeConte 1858a (as Cyclonotum cacti ); Leech 1948 (key to genus); Leng 1920; Moore 1937; Schwarz 1878 (key to species, as Cyclonotum cacti ); Smetana 1978 (key to genus and species); Van Tassell 2001 (key to genus); Woodworth 1913.

Figures

Figs. 6–12. Habitus images of Coleoptera in decayed barrel cacti. 6) Apotrepus densicollis; 7) Carcinops consors;

Figs. 13–19. Habitus images of Coleoptera in decayed barrel cacti. 13) Dactylosternum cacti; 14) Litargus balteatus; 15) Carpophilus discoideus; 16) Carpophilus lugubris; 17) Aleochara (Maseochara) depressa; 18) Aleochara (Maseochara) valida; 19) Diestota sp.