Stenotarsus mexicanus, Arriaga-Varela, Emmanuel, Zaragoza-Caballero, Santiago, Tomaszewska, Wioletta & Navarrete-Heredia, Jose Luis, 2013

Arriaga-Varela, Emmanuel, Zaragoza-Caballero, Santiago, Tomaszewska, Wioletta & Navarrete-Heredia, Jose Luis, 2013, Preliminary review of the genus Stenotarsus Perty (Coleoptera: Endomychidae) from México, Guatemala and Belize, with descriptions of twelve new species, Zootaxa 3645 (1), pp. 1-79 : 26-27

Stenotarsus mexicanus sp. nov.

(Figs. 25, 64, 100, 80, 168, 210–211, 251,261)

Diagnosis. This species shares a similar median lobe with Stenotarsus kafkai sp. nov. ( Figs. 210–211 ). However, it can be easily distinguished by the pronotum and elytra red, each with a large black macula, and by the stouter antennae ( Fig. 64 ) with the antennomeres 3–8 at most 1.5X longer than wide. Stenotarsus mexicanus also strongly resembles contrastly colored specimens of S. militaris Gerstaecker in general appareance, but differs from S. militaris in the shape of terminal antennomere, which is more elongate in S. mexicanus ( Fig. 64 ), by the median lobe, which is not abruptly constricted preapically, in lateral view, and by the female ventrite V truncate instead of emarginate apically, as in S. militaris .

Description of males. Body 5.10–6.00 mm long, moderately long oval, weakly convex (Fig. 25), 1.75–1.80X as long as wide, 3.40–3.45X as long as high. Contrastly colored with head ferruginous red; antenna red with antennomeres 8–11 black; pronotum with a large semicircular black macula reaching anterior margin and not surpassing basal pores at base, lateral margins and angles ferruginous red; hypomeron and prosternum red; scutellum red; elytra red, each with a large, oval, black maculae; epipleura red; meso- and metathorax red with metaventrite infuscate at center; legs orange-red; abdomen orange-red with intercoxal process of first ventrite black or infuscate. Densely covered with long, suberect, golden setae.

Head: Clypeus transverse, 2.2–2.4X wider than long. Terminal labial palpomere narrow, acuminate, narrowly truncate apically. Interocular distance 0.64–0.68X as wide as head. Antenna moderately long and slender ( Fig. 64 ), 0.45X as long as body; scape 1.3X as long as wide, 1.9X longer than pedicel; pedicel 0.9X longer than wide; third antennomere 1.4X as long as wide, 1.5X as long as pedicel; fourth 1.3X as long as wide, 1.4X as long as pedicel; fifth subequal to third; sixth 1.5X as long as wide, 1.5X as long as pedicel; seventh 1.4X as long as wide, 1.5X as long as pedicel; eighth as long as wide, 1.4X longer than pedicel; antennal club, 0.45X as long as total antennal length, with segments almost symmetrical; ninth antennomere widened apically, 1.1X as long as wide, 2.4X as long as pedicel; tenth widened apically, 1.1X as long as wide, 2.7X as long as pedicel; terminal antennomere elongate oval, slightly asymmetrical, widest near apical 2/3, 1.7X as long as wide, 4.5X as long as pedicel.

Prothorax: Pronotum widest at base, strongly transverse ( Figs. 80 , 100 ), 2.15–2.24X wider than long, 1.87– 1.95X wider at base than front angles, 2.17–2.24X wider than head. Sides almost continuously rounded, less convergent in basal half. Front angles moderately produced, right-angled, rounded at tip. Hind angles right-angled. Anterior margin narrow, slightly arcuate medially. Lateral margins raised, markedly wide, narrowing posteriorly; width of margin at base little less than 1/3 of the distance between basal pore and hind angle; area between marginal line and pronotal edge flat. Disc moderately convex, finely and closely punctate. Longitudinal sulci moderately deep and long, weakly curved. Basal pores large, slightly curved, markedly oblique. Basal sulcus wide, complete, feebler near scutellum. Pronotal base lobed medially. Prosternal process moderately wide at base, widened posteriorly; scarcely narrower than longitudinal procoxal diameter apically.

Pterothorax: Scutellum triangular, moderately large, 1.90–2.25X wider than long, 0.17X as wide as pronotum. Elytra 3.4–4.0 mm long, 1.05–1.10X longer than wide, 3.25–3.38X longer and 1.34–1.41X wider than pronotum; markedly ovoid, widest at basal fourth, then roundly convergent to the moderately acuminate apex. Moderately densely punctate with foveolate punctures moderately large and deep, separated by 2–4 diameters, sparser and shallower apically and near scutellum. Humerus moderately prominent. Epipleuron moderately wide at base, 0.8– 0.9X wider than the intercoxal process of metaventrite. Mesoventrite deeply excavated in front; bearing small setose pores laterally; mesoventral process scarcely wider than longitudinal coxal diameter, without medial carinae. Metaventrite moderately convex, without modifications on anterior margin; with pair of small setose pores of approximately same diameter posterior to each mesocoxa. Metepisternum with small setose pore.

Legs: moderately long and slender ( Fig. 168 ). Trochanters simple. Meso- and metafemora moderately widened at midlength, unarmed; metafemur as long as mesofemur, bearing moderately long decumbent setae. Meso- and metatibiae moderately slender; metatibia as long as metafemur, 0.33–0.34X longer than elytra, gradually widened distally, linear, unarmed. Metatarsus 0.56–0.60X as long as metatibia; second tarsomere produced and lobed, 2.5X as wide apically as fourth tarsomere at midlength.

Abdomen: ventrite I almost as long as metaventrite and as long as ventrites II–V combined, with moderately coarse foveolate punctation, without protuberances. Ventrite V slightly longer than IV, with apex truncate. Ventrite VI rounded apically. Tergite VIII truncate. Median lobe very slender, curved, gradually widening apically, then narrowed apically, in ventral view ( Fig. 211 ); narrowed at midlength, in lateral view ( Fig. 210 ). Tegmen with moderately large submembranous tegminal plate.

Description of females. Body 5.2–5.9 mm long, 1.71–1.78X as long as wide, 2.62–2.68X as long as high. Antenna 0.40–0.43X as long as body. Pronotum 2.27–2.33X wider than long, 1.97–2.03X wider at base than at front angles, 2.27–2.33X wider than head. Elytra 3.58–4.10 mm long, 1.15–1.20X longer than wide, 3.45–3.56X longer and 1.27–1.39X wider than pronotum. Metatibia 0.28–0.30X longer than elytra. Metatarsus 0.57–0.59X as long as metatibia. Ovipositor with proctiger rounded, coxites wide, without styli ( Fig. 251 ).

Sexual dimorphism. Females have slightly shorter antennae and longer elytra.

Variation. Black maculae on elytra hardly reach the apical third in one of the parataypes.

Material examined. Holotype (male): Mexico, Motzorongo, Staat Vera Cruz, R. Becker S. / Stenotarsus globosus Guérin , det. H.F. Strohecker (MNB); Paratypes: same data as holotype: (1 male, 4 females: MNB); [same data plus] / Stenotarsus globosus Gúerin (1 male: MNB); Mexico coll. J. Flohr (2 males, 2 females: MNB) [same data plus] / militaris Gerst (1 male: MNB); [same data plus] motzorongo 6 / Stenotarsus prope panamanus Gorham , det. H.F. Strohecker (1 male: MNB); Atoyac 6 / Mexico coll. J. Flohr / rubrocinctus Gerst (1 male; MNB)

Distribution. MEXICO: Veracruz ( Fig.261 ).

Biological Notes. Altitudinal range: 290 m.

Etymology. The specific name is derived from México, the country of origin of this new species.

Figures

FIGURES 200 – 223. Lateral and ventral view of median lobe of edeagus of Stenotarsus spp. 200 – 201) S. cortesi; 202 – 203) S. exiguus; 204 – 205) S. globosus, S. raramuri, S. rubrocinctus, S. shockleyi; 206 – 207) S. guatemalae; 208 – 209) S. incisus; 210 – 211) S. kafkai, S. mexicanus; 212 – 213) S. latipes; 214 – 215) S. lemniscatus; 216 – 217) S. marginalis; 218 – 219) S. mesoamericanus; 220 – 221) S. militaris; 222 – 223) S. molgorae.

FIGURES 54 – 71. Right antennae of Stenotarsus spp. 54) S. cortesi; 55) S. exiguus; 56) S. globosus, S. rubrocinctus; 57) S. guatemalae; 58) S. incisus; 59) S. kafkai; 60) S. latipes; 61) S. lemniscatus; 62) S. marginalis; 63) S. mesoamericanus; 64) S. mexicanus; 65) S. militaris; 66) S. molgorae; 67) S. monterrosoi; 68) S. nigricans; 69) S. oblongulus; 70) S. ovalis; 71) S. parallelicornis.

FIGURES 79 – 89. 79 – 83. Pronotum of Stenotarsus spp. 84 – 89. Intercoxal process of male metaventrite of Stenotarsus spp. 79) S. marginalis; 80) S. mexicanus; 81) S. oblongulus; 82) S. o valis; 83) S. spiropenis; 84) S. incisus; 85) S. monterrosoi; 86) S. oblongulus; 87) S. ovalis; 88) S. rubrocinctus; 89) S. shockleyi.

FIGURES 90 – 104. Pronotum of Stenotarsus spp. 90) S. cortesi; 91) S. exiguus; 92) S. globosus; 93) S. guatemalae; 94) S. incisus; 95) S. kafkai; 96) S. latipes, S. molgorae; 97) S. lemniscatus; 98) S. marginalis; 99) S. mesoamericanus; 100) S. mexicanus; 101) S. militaris; 102) S. monterrosoi; 103) S. nigricans; 104) S. oblongulus.

FIGURES 158 – 173. Hind legs of male Stenotarsus spp. 158) S. cortesi; 159) S. exiguus; 160) S. globosus; 161) S. guatemalae; 162) S. incisus; 163) S. kafkai; 164) S. latipes; 165) S. lemniscatus; 166) S. marginalis; 167) S. mesoamericanus; 168) S. mexicanus; 169) S. militaris; 170) S. molgorae; 171) S. monterrosoi; 172) S. nigricans; 173) S. oblongulus.

FIGURES 244 – 256. Female genitalia structures of Stenotarsus spp. 244) Ovipositor with spermatheca and accessory gland of S. spiropenis, dorsal. 245 – 256. terminal part of ovipositor, dorsal. 245) S. cortesi; 246) S. exiguus; 247) S. globosus, S. raramuri, S. rubrocinctus, S. shockleyi; 248) S. incisus; 249) S. latipes; 250) S. mesoamericanus; 251) S. mexicanus; 252) S. monterrosoi; 253. S. nigricans. 254. S. ovalis. 255. S. sallaei. 256. S. thoracicus.

FIGURES 260 – 262. Distributional maps of Stenotarsus spp. 260) S. guatemalae (C), S. marginalis (S); 261) S. kafkai (C), S. mexicanus (S), S. nigricans (T); 262) S. latipes (C), S. shockleyi (S). Yellow circles (C), red squares (S), blue triangles (T).