Centrinus senilis, Gyllenhal, 1836

Prena, Jens, 2009, A Review of the Species of Geraeus Pascoe and Linogeraeus Casey Found in the Continental United States (Coleoptera: Curculionidae: Baridinae), The Coleopterists Bulletin 63 (2), pp. 123-172 : 140-143

Centrinus senilis of authors (not Gyllenhal 1836). Casey (1892:589), misidentifi-

cation. Geraeus senilis of authors; Champion (1908:265), partial misidentification. Geraeus euryonyx Champion 1910:211 . Syntypes, 1 male, 1 female, labeled

‘‘ Mexico / Hoege.,’’ Champion’s handwriting ‘‘ Geraeus / euryonyx Ch. ,’’ and printed B.C.A. label (BMNH 2); female specimen illustrated in description and later labeled as ‘‘Type’’ by museum staff.

Geraeus balteatus Casey 1920:386 . Holotype female, labeled ‘‘ Santa Rita Mts / Arizona,’’ ‘‘senilis/ Gyll.,’’ ‘‘ Casey / bequest/ 1925,’’ ‘‘ Type USNM/ 37859 ,’’ Casey’s handwriting ‘‘balteatus/ Csy.’’ Synonymy by Hustache (1938:97).

Recognition. Geraeus euryonyx , initially lumped with G. senilis , was recognized as a distinct species by Champion (1910) and, independently, by Casey (1920). The two species exhibit a similar color pattern and are relatively more slender than other species in this complex. Geraeus euryonyx has noticeably wide, ventrally sulcate claws. Other diagnostic characters include length and shape of rostrum ( Fig. 10 ), and possibly details of the male genitalia which I did not study. Geraeus penicillus and G. nimbatus , two other native species in this complex, lack prosternal spines and have laterally compressed claws. The five specimens examined were 3.6–5.5 mm long.

Distribution. The few collecting records suggest that G. euryonyx occurs in the Sierra Madre Occidental and extends into southern Arizona.

Type locality. ‘‘? Sierra de Durango,’’ Mexico .

Plant associations. Unknown.

Material examined. United States: Arizona (Gila Co., Pima Co., Santa Cruz Co. ) ( CWOB 2 , USNM 1 ) . Mexico: [possibly Sierra de Durango according to Champion (1910)] ( BMNH 2 ) . Total 5 specimens.

Temporal occurrence. August to September [2 dates].

Figures

Figs. 9–16. Geraeus species, dorsal and lateral aspects; scale bar 1 mm. 9, 10) G. euryonyx, female; 11, 12) G. nimbatus, female; 13, 14) G. penicillus, male, maculate form; 15, 16) G. penicillus, female, unicolored form.