Linogeraeus squamirostris (Champion) Prena, Jens, 2009

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 : 164

Linogeraeus squamirostris (Champion) , new combination

( Figs. 53, 54 , 78 )

Geraeus squamirostris Champion 1909:488 . Syntypes, 2 males, 4 females, 1 labeled ‘‘Cuernavaca/ Mor, Mex./ Wickham,’’ ‘‘WICKHAM/ Collection/ 1933,’’ ‘‘ ♀,’’ Champion’s handwriting ‘‘ Geraeus / squamirostris/ Ch’’ ( USNM 1 ); 1 ♀ with same labels except Champion’s identification, type status unclear ( USNM) ; other syntypes ( BMNH) not examined.

Recognition. Linogeraeus squamirostris can be recognized by its rather large, elongate pronotum ( Fig. 53 ) and sexual dimorphism. Females have the rostrum basally humped and distally flattened; males have a more evenly curved rostrum with conspicuous scales on the ventral side ( Fig. 54 ) and small, tuberculiform prosternal spines. The total length of the studied specimens was 3.2–4.0 mm.

Distribution. The species occurs in central Mexico and reaches the United States in southern Arizona ( Fig. 78 ).

Type locality. Morelos, Mexico .

Material examined. United States: Arizona ( CWOB 1 ) . Mexico: Morelos ( USNM 2 ) , Nayarit ( CWOB 1 ) , Oaxaca ( CWOB 3 ) . Total 7 specimens.

Temporal occurrence. August [1 date].

Plant associations. Unknown.

Note. Linogeraeus squamirostris is newly recorded for the United States. The single specimen was swept from grass in Madera Canyon, Santa Rita Mountains in 1961. Although L. squamirostris has only been collected once in the United States, I consider the species as native to the United States.

Figures

Figs. 49–56. Linogeraeus species, dorsal and lateral aspects; scale bar 1 mm. 49, 50) L. finitimus, male; 51, 52) L. neglectus, male; 53, 54) L. squamirostris, female (dorsal), male (lateral); 55, 56) L. tonsilis, female, New Mexico, U.S.A.

Figs. 78–79. Map of United States (without northwestern part) and Central America showing distributions of L. hospes, L. laevirostris, L. perscitus, L. tonsilis, and L. squamirostris.