Amnestus obscurus, Martinez & Peredo, 2005

Martinez, Cristina Mayorga & Peredo, Luis Cervantes, 2005, DESCRIPTION OF SIX NEW SPECIES OF AMNESTUS DALLAS (HEMIPTERA-HETEROPTERA: CYDNIDAE) FROM MEXICO, Journal of the New York Entomological Society 113, No. 3 - 4, pp. 159-173 : 168-169

Amnestus obscurus new species

Figs. 1D , 2D , 3D , 4D , 5D , 6D

Description. ( Fig. 1 D ). Jugum with five spines; anterior half of pronotum elevated; ventral margin of prosternal carina distinctly concave mesially, and elevated apically ( Fig. 2 D ); head, antennal segments III, IV, and V, pronotum, prosternal carina, and abdominal venter pale brown; scutellum dark brown; antennal segments I, and II, rostrum, marginal carina of pronotum, clavus, corion, and legs pale yellow.

Head. Anterior half without punctures; tylus with four robust spines on its apex, slightly longer than jugum; antennae with five segments, segment II the smallest; rostrum reaching base of metasternum.

Thorax. Pronotum with anterior margin concave, and anterior half elevated and with dense punctures; anterolateral margins carinated; posterior margin wide, convex, and laterally sinuate. Propleurae shiny and smooth; prosternal carina raised with a concave mesial and a half elevated anterior area ( Fig. 2 D ). Mesopleurae with evaporatorium expanded to the posterior and lateral margins of pleurae. Metapleurae smooth, evaporatorium extending toward middle of pleurae; osteolar peritreme elongate slightly ben, with the apex shiny; posterior margin of evaporatorium serrate with long setae ( Fig. 3 D ). Legs. Fore tibia slightly flattened with seven spines on internal margin; fore femur with a bifid spine on anterior mesial ventral surface ( Fig. 4 D ). Internal and external margins of hind femur serrate, with small tubercle on external margin and small, simple spine near apex of inner margin ( Fig. 5 D ). Scutellum. Triangular, wider than long, acute apex; disc dark brown and densely punctuated. Hemelytra. With numerous punctures uniformly distributed; clavus with three rows of punctures, apical margin bisinuated; hemelytral membrane hyaline and slightly extending beyond the apex of abdomen.

Abdomen. Ventrally convex, dark brown, with numerous long setae in lateral view. Male genitalia: Parameres small; in lateral view leaf shaped, without setigerous punctures ( Fig. 6 A ). Male measurements. (n = 4) Body length 2.81 ± 0.06; head length 0.52 ± 0.06; width across eyes 0.60 ± 0.03; interocular distance 0.34 ± 0.01; interocellar distance 0.17 ± 0.02; antennal segments: I 0.14 ± 0.005, II 0.04 ± 0, III 0.24 ± 0.02, IV 0.25 ± 0.01, V 0.22 ± 0.005; pronotum length 1.04 ± 0.1; width across anterior margin 0.7 ± 0.04; width across humeral angles 1.48 ± 0.03; scutellum: length 0.64 ± 0.05, width 0.69 ± 0.02; length fore femur 0.55 ± 0.04, fore tibia 0.63 ± 0.04; length hind femur 0.81 ± 0.02, hind tibia 0.92 ± 0.04, hind tarsi: I 0.07 ± 0.01, II 0.06 ± 0.01, III 0.09 ± 0.01.

Types. Holotype, male: MEXICO, Veracruz, San Andres Tuxtla, Estacion de Biologia Los Tuxtlas , 26 March 1999; feeding on fruits of Ficus colubrinae, L. Cervantes . ( CNIN) . Paratypes: MEXICO, Veracruz: 3 males, same locality as holotype ( CNIN; IEXA) .

Etymology. Named for the dark brown coloration of the scutellum.

Distribution. Mexico, Veracruz.

Discussion. This species is easy to recognize due to the dark brown color of scutellum; anterior half of pronotum with dense punctures ( Fig. 1 D ), prosternal carina elevated with a mesial depression; evaporatorium extended through posterior and lateral margins of pleura and posterior margin serrate with a few long setae; and peritreme elongated and slightly curved, with shinny apex ( Fig. 3 D ). Parameres small, leaf shaped in lateral view, without setigerous punctures ( Fig. 3 D ). Fore tibia slightly flattened with seven spines on external margin. Femora with a simple spine near apex of inner margin. ( Fig. 5 D ).

Figures

Fig. 1. Dorsal views of adults of Amnestus species. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species. (scale = 1 mm).

Fig. 2. Lateral view head in Amnestus species, showing prosternal carina. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species. (scale = 1 mm).

Fig. 3. Mesothoracic scent gland opennings of Amnestus species. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species. (scale = 1 mm).

Fig. 4. Male fore tibiae of Amnestus species. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species. (scale = 1 mm).

Fig. 5. Male fore femora of Amnestus species. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species. (scale = 1 mm).

Fig. 6. Lateral view of parameres in Amnestus species. A. A. brailovskyi new species; B. A. calakmulensis new species; C. A. carinatus new species; D. A. obscurus new species; E. A. rugosus new species; F. A. sinuosus new species.