Stenotarsus molgorae, 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 : 29-30

Stenotarsus molgorae sp. nov.

( Figs. 28 , 52 , 66 , 96 , 170 , 222 –223, 265 )

Diagnosis. Stenotarsus molgorae is similar to S. latipes Arrow in overall appearance, including the structure of the antennae ( Figs. 60, 66 ) and the pronotum with distinctly narrow lateral margins ( Fig. 96 ). Besides the shape of the median lobe, which is not markedly widened basally in S. latipes ( Fig. 234 ), S. molgorae differs by having all tibiae and tarsi black ( Fig. 28 ). Moreover, males of S. molgorae have the meso- and metatibiae narrower, less curved and without small tubercles on the medial margin ( Fig. 170 ).

Description of males. Body 4.60–4.72 mm long, moderately convex and large ( Fig. 28 ), 1.92–1.96X as long as wide, 3.0–3.1X as long as high. Reddish brown with tibiae and tarsi of all legs and antennae black except first or first two antennomeres which are light brown. Very densely covered with moderately long, decumbent, coppery setae.

Head: Clypeus transverse, 2.1X wider than long. Terminal labial palpomere narrow, acuminate, narrowly truncate apically. Interocular distance 0.66–0.67X as wide as head. Antenna moderately long and stout ( Fig. 66 ), 0.41–0.42X as long as body; scape 1.6X as long as wide, 1.6X longer than pedicel; pedicel as long as wide; third antennomere 1.6X as long as wide, 1.3X as long as pedicel; fourth 1.5X as long as wide, 1.3X as long as pedicel; fifth 1.4X as long as wide, 1.5X as long as pedicel; sixth and seventh subequal to fourth; eighth 1.1X as long as wide, 1.2X longer than pedicel; antennal club 0.4X as long as total antennal length, with segments almost symmetrical; ninth antennomere widened apically, as long as wide, 2X as long as pedicel; tenth widened apically, as long as wide, 2X as long as pedicel; terminal antennomere widest beyond midlength, 1.4X as long as wide, 3.5X as long as pedicel.

Prothorax: Pronotum widest at base, transverse ( Fig. 96 ), 2.05–2.15X wider than long, 1.65–1.75X wider at base than at front angles, 1.89–1.97X wider than head. Sides almost continuously rounded. Front angles moderately produced, right-angled, rounded at tip. Hind angles right-angled or slightly acute. Anterior margin narrow, slightly rounded. Lateral margins hardly raised; distinctly narrow, almost of same width along its length; width of margin at base less than 1/6 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, short, weakly curved. Basal pores small, slightly elongate and oblique. Basal sulcus impressed only near pores. Pronotal base lobed medially. Prosternal process wide, weakly widened posteriorly; slightly wider than longitudinal procoxal diameter apically.

Pterothorax: Scutellum triangular, moderately large, 1.62–1.77X wider than long, 0.19–0.20X as wide as pronotum. Elytra 3.15–3.30 mm long, 1.30–1.35X longer than wide, 3.75–4.00X longer and 1.35–1.44X wider than pronotum; long ovoid, widest at basal third, then roundly convergent to the acuminate apex. Moderately densely punctate with foveolate punctures moderately large and deep, separated by 3–5 diameters, sparser and shallower near apex of elytra and scutellum. Humerus moderately prominent. Epipleuron moderately wide at base, 0.8X as wide as the intercoxal process of metaventrite. Mesoventrite deeply excavated in front, bearing small setose pores laterally, mesoventral process wider than longitudinal coxal diameter, without medial carinae. Metaventrite weakly convex, almost flat in center, 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 somewhat stout ( Fig. 170 ). Trochanters simple. Meso- and metafemora moderately widened at midlength, unarmed; metafemur as long as mesofemur, bearing moderately long decumbent setae. Meso- and metatibiae rather stout, moderately curved; metatibia slightly shorter than metafemur, 0.28–0.30X longer than elytra, continuously widened distally, without row of very small tubercles. Metatarsus 0.61–0.64X as long as metatibia; second tarsomere produced and lobed, 3X as wide apically as fourth tarsomere at midlength. Abdomen: ventrite I as long as metaventrite and slightly shorter than ventrites II–V combined, with moderately coarse foveolate punctation, without protuberances. Ventrite V almost 1.5X longer than IV, with apex slightly truncate. Ventrite VI acuminate apically. Tergite VIII truncate. Median lobe comparatively short and stout, curved, narrowing apically, slightly bent externally, in ventral view ( Fig. 223 ); widened apically, in lateral view ( Fig. 222 ). Tegmen with moderately large submembranous tegminal plate.

Description of females. Body 5.3–5.6 mm long, 1.95–2.12X as long as wide, 3.10–3.25X as long as high. Antenna 0.36–0.38X as long as body. Pronotum 2.08–2.15X wider than long, 1.77–1.80X wider at base than at front angles, 2.03–2.07X wider than head. Elytra 3.8–3.9 mm long, 1.36–1.43X longer than wide, 4.0–4.1X longer and 1.3–1.4X wider than pronotum. Metatibia 0.25–0.28X as long as elytra, slightly curved. Metatarsus 0.56– 0.59X as long as metatibia. Ovipositor with proctiger acuminate, coxites wide, without styli.

Sexual dimorphism. Females have proportionally less elongate antennae, longer elytra, and less curved meso- and metatibiae.

Variation. No significant variation was found.

Material examined. Types. Holotype (male): Jal, Tequila, Volcán de Tequila, BEP, 1868 m, 20º49’24.8’’N, 103º51’21.9’’W, ex Lactarius , 21.IX.2006, E. Arriaga–Varela & A. Mólgora cols. (CZUG); Paratypes: same data as holotype: (3 males, 8 females: CZUG; 1 male, 1 female: MIZ; 1 male, 1 female: CNIN; 1 male: NMNH; 1 male: NHM); México: Jal, Tequila, Volcán de Tequila, Km. 12 de la brecha a las antenas, BPE, 2200 m, ex Lactarius , 16.IX.2006, I.G. Rocha & J. Cortés cols. (6 males, 5 females: CZUG; 1 male, 1 female: INBIO; 1 male, 1 female: IEXA; 1 male: MNB).

Distribution. MEXICO: Jalisco ( Fig. 265 ).

Biological Notes. Altitudinal range: 1868–2200 m. Habitat: Pine-Oak forest. Period of activity: September. Host fungi: Lactarius sp. (Agaricales: Russulaceae ). Habit: this species was collected feeding on fungi along with Stenotarsus latipes ( Fig. 52 ).

Etymology. This species is dedicated to biologist Ana Mólgora Tapia, co-collector of the holotype.

Figures

FIGURES 26 – 37. Habitus in dorsal view of Stenotarsus spp. Scale bar = 1 mm. 26 – 27) S. militaris; 28) S. molgorae; 29) S. monterrosoi; 30) S. nigricans; 31 – 32) S. oblongulus; 33) S. ovalis; 34) S. parallelicornis; 35) S. raramurii: 36) S. rubrocinctus; 37) S. rulfoi.

FIGURES 50 – 53. Habits of Stenotarsus spp. 50) Pupae of S. cortesi sp. nov. on a dead log; 51) A pair of S. latipes Arrow mating on a dead log with Stereum ostrea fungi; 52) S. latipes and S. molgorae sp. nov. feeding on Lactarius sp.; 53) S. spiropenis sp. nov. feeding on Polyporus tenuicollis.

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 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 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 263 – 265. Distributional maps of Stenotarsus spp. 263) S. lemniscatus (C), S. monterrosoi (S); 264) S. militaris (C), S. smithi (S); 265) S. ovalis (C), S. molgorae (S), S. thoracicus (T). Yellow circles (C), red squares (S), blue triangles (T).

FIGURES 224 – 243. Lateral and ventral view of median lobe of edeagus of Stenotarsus spp. 224 – 225) S. monterrosoi; 226 – 227) S. nigricans; 228 – 229) S. oblongulus; 230 – 231) S. ovalis; 232 – 233) S. parallelicornis; 234 – 235) S. rulfoi; 236 – 237) S. sallaei; 238 – 239) S. smithi; 240 – 241) S. spiropenis; 242 – 243) S. thoracicus.