Temnocerus oaxacensis, Hamilton, 2010

Hamilton, R. W., 2010, Central American Temnocerus Thunberg, 1815 (Coleoptera: Rhynchitidae), Insecta Mundi 2010 (128), pp. 1-42 : 26-27

Temnocerus oaxacensis , new species

( Fig. 31, 32 , 73 , 91 )

Type locality. Mexico, Oaxaca, 4 km W Capulalpan

Type depository. Canadian Museum of Nature, Ottawa, Canada ( CMNC)

Type specimens. Holotype male and allotype with the following data: Mexico , Oaxaca , Hwy 175, 4 km W Capulalpan, 2000 m, 13.vi.1979, H & A Howden ( CMNC) . Paratype data as follows: GUATEMALA:

1 female, Guat. [Guatemala], Guatemala City , 1511 m, 10.vi.1991, H & A Howden ; 1 female, Guat., Guatemala City, Univ. Del Valle , 1400 m, 10-vi-1991, R Anderson, oak/pine/ Mimosa forest ; MEXICO: 1 female with same data as primary types ; 1 female, Mex. Oax. 12-13 km S Miahuatlan, 6-viii-1986, H & A Howden ; 1 female, Mexico, Oaxaca, 12.5 km SW Gueletao , 27-ii-1992, 1900 m, oak scrub, RS Anderson ; 1 female, Mexico, Oaxaca, 5 km N Oaxaca, 11-vi-1979, 1700 m, H & A Howden ( CMNC). 1 male, Oaxaca, 6 mi. ne Mitla , July 20, 1985, Jones, Schaffner ( TAMU) .

Description. Color and pubescence: Body bluish-black throughout; head and pronotum with a greenish to brassy luster. Pubescence composed of fine brownish reclinate setae; setae sparse on head, pronotum and ventrals; setae more numerous on elytra, legs and antennae. Size: Male (n = 2) 3.2 × 1.4 mm; Female (n = 7) 3.2 × 1.4 mm to 3.6 × 1.4 mm. Head quadrate, moderately punctured, interspaces minutely granulose, silky in appearance; eyes large, strongly protuberant. Rostrum slightly longer than head, parallel-sided, basal 1/2 minutely strigate dorsally; in lateral view nearly straight, with scattered punctures. Antennae inserted near basal 1/5 of rostrum; scape and funicular segment 1 ovoglobose, subequal; funicular segment 2 narrow, weakly clavate, slightly shorter than segment 1; funicular segments 3 and 4 subequal to 2 in length, slightly more robust than 2; segments 5-7 subequal in length to 3 and 4 but bead-like; club abruptly widened; basal segment largest, subtriangular, middle segment transverse, shorter than basal segment; terminal segment smaller than middle segment, rounded, weakly acuminate at apex. Pronotum as wide as long; sides distinctly arched out, widest just behind middle, densely punctured; interspaces minutely granulose, silky in appearance. Scutellum rectangular, twice as wide as long, punctured. Elytra elongate, more than twice as long as pronotum; widest just behind middle; humeri simple; striae moderately to weakly impressed, distinct throughout; with setigerous punctures on interspaces between striae; intervals flat, about as wide as striae, minutely rugose; with rowed setigerous punctures. Thoracic pleura and sterna moderately to densely punctured. Abdominal ventrites minutely strigate; with minute scattered punctures; with short appressed setae laterally; weakly concave through middle.

Distribution. Specimens were taken in Guatemala near Guatemala City and the Mexican state of Oaxaca ( Fig. 91 ).

Etymology. The specific epithet is in reference to the Mexican state of Oaxaca.

Comments. Relatively large bluish-black adults that are closely related to T. giganteus . They can be distinguished from T. giganteus by the distinctly shorter rostrum in each sex, the more strongly protuberant eyes and the more strigate rostral base. The aedeagus ( Fig.73 ) has a wide median lobe that is constricted at the middle and strongly tapered into a narrowly truncated apex. The tectum is spearheadshaped and sharply pointed. The tegminal cap piece is wide at the base with the sides distinctly narrowed through the middle and widened again into the broadly rounded apex bearing numerous long wavy marginal setae. Endophallic bands are linear, long and distinctly pigmented.

Plant association. Unknown.

Figures

Figure 23-34. Heads of Temnocerus species, frontal view, male left and female right. 23-24) T. mexicanus n.sp., holotype and allotype. 25-26) T. michoacensis n.sp., holotype and allotype. 27-28) T. minutus n.sp., holotype and allotype. 29-30) T. niger n.sp., holotype and allotype. 31-32) T. oaxacensis n.sp., holotype and allotype. 33-34) T. obrieni n.sp., holotype and allotype.

Figure 59-86. Aedeagal tegmen and median lobe of Temnocerus species, dorsal view, 64X. 59) T. abdominalis (Voss). 60) T. chiapensis n. sp. 61) T. chiriquensis (Sharp). 62) T. confertus (Sharp). 63) T. cyaneus n. sp. 64) T. ellus n. sp. 65) T. giganteus n. sp.; 66) T. guatemalenus (Sharp). 67) T. guerrerensis n. sp. 68) T. herediensis n. sp. 69) T. mexicanus n. sp. 70) T. michoacensis n. sp. 71) T. minutus n. sp. 72) T. niger n. sp. 73) T. oaxacensis n. sp. 74) T. obrieni n. sp. 75) T. oculatus (Sharp). 76) T. potosi n. sp. 77) T. pseudaeratus n. sp. 78) T. pueblensis n. sp. 79) T. pusillus (Sharp). 80) T. regularis (Sharp). 81) T. rostralis n. sp. 82) T. rugosus n. sp. 83) T. salvensis n. sp. 84) T. tamaulipensis n. sp. 85) T. thesaurus (Sharp) 86) T. yucatensis n. sp.

Figure 91-94. Distribution of Temnocerus species. 91) T. rugosus, red; T. obrieni, black; T. oaxacensis, blue; T. niger, green. 92) T. pseudaeratus, black; T. potosi, blue; T. cyaneus, green; T. oculatus, red. 93) T. pueblensis, red; T. pusillus, blue; T. regularis, black; T. salvensis, green. 94) T. tamaulipensis, red; T. thesaurus, blue; T. yucatensis, black.