Diagnose of the nominal subgenus of Edessa and description of the E. sexdens group (Heteroptera, Pentatomidae, Edessinae) Author Mendonça, Maria Thayane Da Silva Author Silva, Valéria Juliete Da 0000-0002-1845-5228 valeriajuliete@hotmail.com Author Fernandes, José Antônio Marin text Zootaxa 2023 2023-02-14 5240 1 1 63 http://dx.doi.org/10.11646/zootaxa.5240.1.1 journal article 256481 10.11646/zootaxa.5240.1.1 4d650293-3f9a-4bbe-9530-204a3b09ef8b 1175-5326 7639547 2FE467C1-EAC2-4E90-B673-CCE2CCA93C1D Edessa nigricornis . Lectotype female. México / Sallé / ( NHRM ). Examined. Material examined. MEXICO , Veracruz : 1♁, Unam , Los Tuxtlas esta. Biol. , 16–19-IX-1989 , E. Barrera & T. J. Henry coll. ( USNM ) ; 1♀ , Los Tuxtlas esta. Biol. , 18-III-1985 , P. Sinaca ( Comp. W type — Fernandes JAM 1999) ( UFPA ) ; Quintana Roo : 1♁, Tulum , Pointana , 3-VIII-1981 , E. PECH ( UNAM ) ; 1♀ , Quintunalo , Muivolcan , VII-1983 , F. L. Welling ( JEE ) ; 1♁, Quintana , Roo Nuevo , 13-VIII-1982 , E. C. Welling coll. ( JEE ) ; Chiapas : 1♁, Chiapas , Junho , D. B. Thomas coll. (TH) . GUATEMALA , El Petén : 1♁, Tikal , Peten , 16-VIII-1974 , D. Engleman ( DOE ) ; Izabal : 1♀ , Morales , 1-V-1972 ( UFPA ) . Measurements (n= 8). Total length: 18.8–22.3; head length: 1.8–1.9; head width: 3.5–3.5; pronotum length: 4.2–4.8; pronotum width: 13.5–16.1; scutellum length: 8.5–9.7; scutellum width: 6.5–8.0; abdominal width: 10.8– 13.0; length antennomers: I: 1.0–1.0; II: 1.5–1.5; III: 1.9–2.0; IV: 3.9–4.0; V: 0.0–0.0. Diagnosis. Specimens large ( 18.8–22.3 mm ). Dorsal surface olive green ( Fig. 28 C ). Ventral surface dark yellow to brown with transversal brown lines on thorax and abdomen ( Fig. 28 D ). Antennae with first segment brown and second segment dark brown ( Fig. 28 C ). Pronotum with punctures brown ( Fig. 28 C ). Humeral angles short (1,2 times wider than long) ( Fig. 28 C ), apices black ( Fig. 28 C ); humeral angle black spot restricted to the angle in dorsal and ventral views ( Fig. 28 C,D ). Scutellum with punctures brown ( Fig. 28 C ); apex not reach end of corium ( Fig. 28 C ). Corium with all veins concolorous with surface ( Fig. 28 C ). Posterolateral angles of connexivum with apices concolorous with surface ( Fig. 28 C ); connexival segments with subelliptical black spots occupying less than half the segments ( Fig. 28 C ); spots not extending ventrally ( Fig. 28 D ). Ventral surface. Thorax with brown stripes ( Fig. 28 D ); dark stripe of the propleuron covering 2/3 of the width of the sclerite ( Fig. 28 D ). Evaporatorium concolorous with thorax ( Fig. 28 D ). Metasternal process ( Fig. 16 G ) with anterior apex straight and laterally well expanded, margin acuminated; anterior face somewhat excavated; anterior bifurcation receiving fourth rostral segment. Legs brown ( Fig. 28 D ). Abdomen with spine of third segment acuminated. Intersegmental areas black not reaching lateral margin ( Fig. 28 D ). Pseudosutures concolorous with surface ( Fig. 28 D ). Median longitudinal brown band incomplete ( Fig. 28 D ). Trichobotria one in line with spiracle and the other laterad. Posterolateral angles of segment VII not reaching the level of apices of laterotergites IX in females ( Fig. 16 F ). Male genitalia, dorsal side of the pygophore with a suffused brown area occupying 1/3 of the surface ( Fig. 16 B,D,E ). Posterolateral angle of the pygophore developed ( Fig. 16 A ). Superior process of genital cup laminar, rectangular, thick; flattened and coarse un posterior view, continuing ventrally in a crenulated long carina ( Fig. 16 B,E ). Ventral rim setose with medial tufts ( Fig. 16 C ). Female genitalia, laterotergites VIII with dark band on outer lateral margins. ( Fig. 16 F ). Male genitalia ( Fig. 16 A–E ): Parameres with black margin; anterior lobe round; dorsal lobe rounded and subtriangular; posterior lobe subrectangular and rounded ( Fig. 16 B,D,E ). Proctiger with subtriangular posterior face ( Fig. 16 D,E ). Ventral rim with expansions undeveloped and concolorous with surface ( Fig. 16 C ). Female genitalia: Valvifers VIII with dark punctures; inner margins contiguous, with brown band and divergent; distal margin with brown band and arched. Laterotergites IX with apices rounded passing the sclerite uniting laterotergites VIII ( Fig. 16 F ). Comments. The male of Edessa (E.) nigricornis is described for the first time. The E. (E.) nigricornis is quite similar to E. (E.) electa and E. (E.) nigroangulata . These species are large and show the humeral angles short and curved backwards ( Fig. 28 C ). But E. (E.) nigricornis can be separated by humeral angles clearly more developed than in the other species ( Figs. 25 C , 28 C,E ). Also, each connexival segment without concavities or medial yellow spot ( Fig. 28 C ), and punctures uniformly distributed, while in E. (E.) electa and E. (E.) nigroangulata connexival segments clearly show concavities separated by yellow spots ( Figs. 25 C , 28 E ), and punctures are irregularly distributed around yellow spot. Distribution ( Fig. 32 A,B ): MEXICO : Veracruz , Quintana Roo , Chiapas , Mexico City ; GUATEMALA : El Petén , Izabal .