Stenoeurilla, Brailovsky & Barrera, 2012

Brailovsky, Harry & Barrera, Ernesto, 2012, Review of the Stenoscelidea complex and key to the known genera of Stenoscelideini (Hemiptera: Heteroptera: Coreidae), Acta Entomologica Musei Nationalis Pragae (suppl.) 52 (2), pp. 355-370 : 368-369

Stenoeurilla gen. nov.

Type species. Stenoscelidea aenescens Stål, 1870: 154 , here designated.

Description. Head wider than long, quadrate, non-declivent, dorsally flat, and parallel-sided in front of eyes; clypeus extending as short tubercle, slightly rounded at tip, wider at apical third, surpassing antenniferous tubercle by about a third, base much lower than antenniferous tubercle; juga not visible from above, apically globose, deflexed below antenniferous tubercle; antenniferous tubercle short, unarmed, nearly parallel, oblique at apex, apex inner directed; distance between antenniferous tubercle subequal to width of one tubercle; postclypeal sulcus deep, with slight ridge running through it longitudinally, forming two sulci, or postclypeal sulcus deep, simple, without ridge at middle third; antennae longer than total body length; antennal segment I stouter than segments II to IV, slightly curved outward, longer than maximal length of head; segments II and III cylindrical, moderately slender and IV fusiform, elongate; antennal segment IV the longest, I the shortest, and II longer than III; antennal segment IV not longer than II and III together; ocellar tubercle large, raised; ocelli close to eyes; preocellar pit deep; eyes medium-sized, hemispheric, protuberant; postocular tubercle nearly smooth with contour of eye, nearly indistinct; bucculae nearly semicircular, short, elevated, unarmed, not projecting beyond middle of eye; rostrum reaching posterior third of mesosternum, or anterior border of metasternum; rostral segment I the longest or subequal to II, III the shortest, and II longer or subequal to IV; rostral segment I not extending past head or reaching anterior border of prosternum ( Figs. 17–18, 23–24 ).

Thorax. Pronotum wider than long across humeral angles, trapezoidal, declivent, with distinct collar; frontal angles blunt, convex; anterior, anterolateral, posterolateral and posterior borders smooth, never tuberculate-spinose; humeral angles rounded, obtuse, gently exposed, with or without tiny spine; triangular process absent; anterior lobe impunctate; posterior lobe heavily punctate, not tuberculate; callar region almost flat, scarcely convex, finely punctate, with few low tubercles (sometimes difficult to see) and posteriorly with two deep longitudinal to discoidal sulcus lateral to midline; prosternum deeply concave; mesosternum slightly sulcate, or difficult to see the sulcus, not forming raised tubercle anteriorly between procoxae; metasternum not sulcate; metapleural supracoxal spine absent; metathoracic scent gland opening with two separate lobes, opening directed laterally; anterior lobe auriculiform, posterior lobe small, digitiform to acute ( Figs. 28–29 ).

Legs. Femora slender, never incrassate in either sex, ventrally armed with two subapical spines and one row of short and stout spines, dorsally smooth to finely granulate; hind femur in both sexes exceeding apex of last abdominal segment; fore and middle tibiae, cylindrical, sulcate, unarmed; hind tibiae conspicuously foliaceous, expanded, widely in females, more narrowly in males; inner expansion smooth, outer expansion scalloped; inner and outer face not spined ( Figs. 1–2 ).

Scutellum longer than wide or nearly equilateral; triangular, with apex subacute; scutellar disk flat.

Hemelytra macropterous, extending beyond apex of abdomen; apical margin slightly sinuate; apical angle extending beyond middle third of membrane; costal margin emarginate.

Abdomen. Connexival segments raised above terga; posterior angle unarmed, never spined posteroapically; upper border with few tubercles along the entire edge; abdominal spiracles circular; abdominal spiracles III to VII closer to anterior third; abdominal sterna without medial furrow.

Male genitalia. Posteroventral edge of genital capsule gently concave or with short ‘V’ concavity or deep U-shaped concavity or variable through the species; posterolateral angles rounded.

Female genitalia. Abdominal sternite VII with fissure covering the total length of the sternite and clearly overlapped; plica not visible; gonocoxae I quadrate, inner margin overlapping or not, upper and outer margins obliquely straight; paratergite VIII large, rectangular to quadrate with visible spiracle; paratergite IX longer than VIII, quadrangular.

Color. Head with neck transversely yellow to yellowish orange, except for two broad longitudinal black stripes, running lateral to midline ( Figs. 17–18, 23–24 ); pronotal disk and scutellar disk with yellowish orange to dark yellow longitudinal medial stripe ( Figs. 28–29 ); corial veins almost entirely yellow; body surface with or without metallic and bluish or green iridescence.

Integument. Pro-, meso-, and metapleura densely and deeply punctate.

Differential diagnosis. Stenoeurilla gen. nov., like Stenoscelidea , has the metathoracic scent gland peritreme bilobate, antennal segment IV the longest, I the shortest, and II longer than III, hind femur exceeding the apex of the last abdominal segment, hind tibiae expanded, posterior angle of connexival segments unarmed, and abdominal sterna without medial furrow.

Stenoeurilla gen. nov. can be distinguished by having the neck (head) transversely yellow to yellowish orange except for two broad longitudinal black stripes, running lateral to middle line, pronotal disk and scutellar disk with yellowish orange to dark yellow longitudinal medial stripe; rostral segment I the longest or subequal to II, III the shortest, and II longer or subequal to I, callar region almost flat, finely punctate with few low tubercles, preocular distance longer; corial veins yellow; and pro-, meso-, and metapleura densely and deeply punctate.

In Stenoscelidea the neck is always transversely black; pronotal disk and scutellar disk without yellowish orange to dark yellow longitudinal medial stripe; rostral segment IV the longest, III the shortest, and I and II subequal; callar region raised, impunctate; preocular distance shorter; corial veins not uniformly yellow; and pro-, meso-, and metapleura impunctate, except the posterior margin with finest punctuation.

Etymology. Named for its similarity to Stenoscelidea ; gender feminine.

Distribution. Widespread through Mexico and Central America ( Guatemala, Costa Rica) except S. peruvianus recorded from South America ( Peru).

Included species. Stenoeurilla aenescens ( Stål, 1870) comb. nov., S. glabra ( Brailovsky, 1983) comb. nov., S. hansoni ( Brailovsky & Barrera, 1997) comb. nov., S. maya ( Brailovsky, 1983) comb. nov., S. mimica ( Brailovsky, 1983) comb. nov., S. pellucida ( Brailovsky & Barrera, 1997) comb. nov., S. peruviana ( Brailovsky & Barrera, 1997) comb. nov., and S. prolixa ( Brailovsky, 1983) comb. nov.

Figures

Figs. 17–27. Head. 17–22 – dorsal view; 23–27 – lateral view. 17, 23 – Stenoeurilla aenescens (Stål, 1870); 18, 24 – S. maya (Brailovsky, 1983); 19, 25 – Plaxiscelis pagana (Burmeister, 1835); 20, 26 – Nyttum punctatum (Dallas, 1852); 21 – Stenoscelidea albovaria Westwood, 1842; 22, 27 – S. atra Brailovsky & Barrera, 1996.

Figs. 28–32. 28–31 – pronotum and scutellum: 28 – Stenoeurilla aenescens (Stål, 1870); 29 – S. maya (Brailovsky, 1983); 30 – Stenoscelidea albovaria Westwood, 1842; 31 – S. hilaris Breddin, 1903. 32 – Stenoscelidea pucalpa sp. nov., caudal view of male genital capsule.

Figs. 1–16. Hind leg. 1–2 – Stenoeurilla aenescens (Stål, 1870); 2 – S. maya (Brailovsky, 1983); 3 – Plaxiscelis pagana (Burmeister, 1835); 4 – Nyttum punctatum (Dallas, 1852); 5 – Stenoscelidea albovaria Westwood, 1842; 6–7 – S. blotei Brailovsky & Barrera, 1996; 8 – S. hilaris Breddin, 1903; 9 – S. saphes sp. nov.; 10 – S. morona Brailovsky & Barrera, 1996; 11 – S. t-nigra (Costa, 1863); 12 – S. pucalpa sp. nov.; 13 – S. roraima Brailovsky & Barrera, 1996; 14–15 – S. rubra Montandon, 1895; 16 – S. tibialis Brailovsky & Barrera, 1996.