Temnocerus mexicanus, Hamilton, 2010

Hamilton, R. W., 2010, Central American Temnocerus Thunberg, 1815 (Coleoptera: Rhynchitidae), Insecta Mundi 2010 (128), pp. 1-42 : 23-24

Temnocerus mexicanus , new species

( Fig. 23, 24 , 69 , 90 )

Type locality. Mexico, Mexico, 13 mi. N. Acambay

Type depository. Charles W. O’Brien collection ( CWOB).

Type specimens. Holotype male and allotype with the following data: MEXICO: Mex. 13 mi. N. Acambay, 8,400’, Aug. 15, 1974, C & L O’Brien & Marshall ( CWOB) . Paratype data as follows: 2 males and 1 female with same data as primary types ; 1 male and 1 female, Sinaloa, 6.5 mi. E. Potrerillos, viii-21- 1964, P.A. Rauch ; 1 female, Mex., La Mirasol , 7 km SW Santiago de Tianguistengo, xi-2-1973, 2,800 m, CW O’Brien ( CWOB) .

Description. Color and pubescence: Body black throughout, extremities brownish-black; pronotum with faint brassy luster. Pubescence of short, fine, reclinate, whitish setae. Size: Male (n = 4) 2.0 × 0.7 mm to 2.2 × 0.8 mm; Female (n =4) 1.9 × 0.7 mm to 2.3 × 0.8 mm. Head quadrate, moderately punctured; interspaces minutely granulose; frons wide, twice as wide as rostral base; eyes moderately protuberant. Rostrum about.33 times longer than head, moderately punctured laterally and mid-dorsally at base; mid-dorsal base to antennal insertions minutely granulose; mid-dorsally from antennal insertions to apex smooth, shiny; apex distinctly widened, width at apex nearly twice as wide as width at base; in lateral view distinctly arcuate; apex only slightly flattened. Antenna shorter than rostrum, inserted at basal 1/4 of rostrum; scape and funicular segment 1 ovoglobose, subequal in length; funicular segment 1 more robust; funicular segments 2-4 subequal, narrow, weakly clavate; segments 5-7 subequal, short, beadlike; club abrupt; basal and middle segment subequal in length; basal segment tapered at base; middle segment transversely subrectangular; terminal segment slightly longer than basal or middle segment, roundly acuminate. Pronotum as long as wide, distinctly widened and rounded out just behind middle, densely punctured; interspaces smooth, shiny. Elytra about twice as long as pronotum, widest just behind middle; humeri simple; strial punctures distinct and similar throughout, deeply impressed; intervals weakly convex, with single row of setigerous punctures; interspaces between striae with single setigerous puncture. Thoracic pleura and sterna moderately to densely punctured; punctures coarse. Abdominal ventrites weakly concave through middle, moderately punctured; punctures small round; with longer more numerous erect and semi-erect setae through middle.

Distribution. Adults have been collected in the Mexican states of Mexico and Sinaloa ( Fig. 90 ).

Etmology. The specific epithet is derived from the country name of Mexico

Comments. Temnocerus mexicanus can be distinguished by the rostrum. It is mid-dorsally smooth and shiny from the antennal insertions to the apex, strongly arcuate, distinctly widened and only slightly depressed apically. The female is very similar but the rostrum is longer and the abdominal ventrites more convex and lacking the median setosity. The aedeagus ( Fig. 69 ) has a median lobe with the sides weakly narrowed through the middle. The pedon is weakly constricted just before the truncate apex. The tectum

is spatulate with a broadly rounded apex. The tegminal cap piece is broadly finger-like with the pigmented apex bearing a cluster of very short setae. Endophallic bands are linear and weakly defined.

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 87-90. Distribution of Temnocerus species. 87) T. abdominalis, red; T. chiapensis, blue; T. chiriquensis, black; T. rostralis, green. 88) T. confertus, red; T. ellus, blue; T. giganteus, black. 89) T. guerrerensis, blue; T. guatemalenus, red; T. herediensis, black. 90) T. mexicanus, red; T. michoacensis, blue; T. minutus, black.