Euscelus stockwelli, Hamilton, R. W., 2001

Hamilton, R. W., 2001, New Species Of Euscelus Schoenherr From Central America (Coleoptera: Attelabidae), The Coleopterists Bulletin 55 (4), pp. 453-470 : 461-463

Euscelus stockwelli , new species

Figs. 2 , 9 , 15

Type Locality. Panama, Canal Zone , Cerro Galera .

Type Series. The type series consists of 30 specimens from the Republic of Panama. The holotype male and allotype female are labeled as follows: Canal Zone, Cerro Galera, 5. Jan. 1976, Col. HP Stockwell ( HPSC). The sex and label data of the 28 paratypes are as follows: 1 female, same as primary types; 1 female, Panama province, El Llano Carti rd., km 9, el. 350 m, 7,8­ v­ 1991, beating foliage, Terminalia amazonica [ amazonia ?], Windsor­Stockwell ( HPSC); 1 female, same as previous except 8­v­1991, Stockwell; 1 male, Panama pr. Cerro Jefe, 30­vi­ 1971, 700 m, Terminalia, HA Hespenheide ( CHAH); 1 male and 1 female, same as previous except 22­vi­1971, 9°14'N – 79°23'W ( CHAH); 1 male, Panama pr. [Province], Cerro Campana, 17­vii­ 1977, 850 m, 8°40'N – 79°56'W, Terminalia, HA Hespenheide ( CHAH); 1 female, Panama prov., Pozo Azul, Finca Vega nr. Las Nubes, 671 m, 26­i­1975, D.C.Rentz ( CASC); 1 female, pipeline rd., 1971, Terminalia, G Vogt ( USNM); 4 males and 2 females, Serra [sic] Campana, 1971, Terminalia, G Vogt ( USNM); 3 females, same as previous except 1970 ( USNM); 1 male and 1 female, PAN., km 7.5–9, Llano Carti Road, viii­3­1995, CW and LB O’Brien ( CWOB); 1 female, [same as previous except, vii­28­1995] ( CWOB); 1 female, Panama C. Z., Ft. Sherman, 8­viii­82, col. D Engleman ( CWOB); 1 male, Canal Zone, Fort Gulick, Qts. 40, March 1979, at light, HJ Harlan ( CWOB); 1 male, Canal Zone, Barro Colorado Is., UV trap 1 (3 m high), 9 Apr. 1997, H Wolda ( CWOB); 1 male, Panama, Cerro Jefe, June 9, 1985, E Riley and D Rider ( CWOB); 1 male and 1 female, Panama Pr., El Llano­Carti road, km 7– 9, 400 m, 6­vi­1995 ­06, RS Anderson ( CMNC); 1 female, Pma. Pr. [Panama Province], Llano­Carti rd., km 8, El 350 m, 25 Aug. 1984, Stockwell ( CMNC). Not included in type series: 2 males and 1 female, [ Panama?], 1978, G Vogt ( USNM).

Type Deposition. The holotype and allotype are located in the USNM. All paratypes are located in their parent collections except the following: 1 male and 1 female, Serra [sic] Campana, 1971, Terminalia, G. Vogt ( RWHC) ; 1 male and 1 female, same as previous ( CMNC) ; 1 male and 1 female, same as previous except female, 1970 ( CASC) ; 1 male, [ Panama], 1978, G Vogt ( AMNH) .

Color and Pubescence. Body reddish­brown with pronotum, middle legs, hind legs, abdominal ventrals and pygidium distinctly paler. Elytra with slightly raised yellowish markings. Pubescence absent above on head, pronotum and elytra; elytra with only a few small widely spaced erect pale setae near the apical and apico­lateral margins. Rostral apex, antennae, pygidium, legs and mid­ventrals more or less sparsely set with fine pale reclinate setae.

Size Range. Male 4.6 × 1.8 mm to 5.2 × 2.1 mm; Female 4.8 × 1.9 mm to 5.3 to 2.2 mm.

Adult Descriptive Synopsis. Head more or less rectangular, weakly constricted across middle; vertex smooth, shiny, without punctures; with narrow postocular punctate band along margin of eye; genae moderately punctured; frons with deep median channel; eyes strongly protuberant. Rostrum short, ½ as long as head; in lateral view weakly arcuate; in dorsal view widening from antennal insertions to apex; width at apex about ½ wider than width at base; base three times wider than frons; dorsal apex sparsely punctured. Antenna inserted dorso­laterally at basal 1/3 of rostrum; club compact; basal and terminal segments subequal in length; middle segment slightly shorter; terminal segment acuminate. Pronotum wider than long; in dorsal view sides arched out in anterior half; dorsal anterior edge weakly emarginate through middle; anterior and posterior width subequal; dorsally without punctures, smooth, shiny; laterally and postero­laterally with some punctures; with two deep oblique grooves; grooves meeting at middle forming wide V­shaped depression; anterior collar distinct, wide through middle; subbasal constriction linelike, distinct throughout; width of basal piece at midline subequal to midline width of anterior collar. Elytra about 1/4 longer than wide; widest behind middle; moderately depressed in middle behind scutellum; moderately raised around scutellum; declivity abrupt; strial punctures distinct throughout; intervals smooth, shiny, weakly convex, as wide as width of striae; each elytron with seven yellow marks; one along entire first interval from scutellum to apex, curving around apex; one dorso­lateral, large, elongate, wide, covering intervals 5–8, distinctly widened posteriorly, extending from humerus to near elytral declivity; and five marks from declivity to apex on intervals 2, 3, 5, 6 and 7. Thorax with pleura and lateral edges of sterna coarsely punctured; metathoracic sternum smooth, bulbous each side of middle. Legs with front pair greatly enlarged; profemur swollen, stalked, armed. Abdomen with sterna 1–3, subequal, smooth, shiny, minutely crenulate, with small scattered lateral punctures; sterna 4 and 5 subequal, moderately punctured, slightly shorter at midline than sterna 1–3; all sutures distinct, somewhat weaker laterally; pygidium and tergum between elytral apices densely punctured.

Profemoral Sexual Dimorphism. The profemur in males has a disti­ventral

thornlike projection, a medio­ventral angled and apically acute spine and a round setose pit near the base of the medio­ventral spine ( Fig. 2a ). The profemur in females is armed with an disti­ventral thornlike spine and a small straight medio­ventral denticulate projection.

Distribution ( Fig. 15 ). All available specimens are from the Republic of Panama near or in the canal zone.

Comments. Euscelus stockwelli can easily be distinguished from other euscelines by the elytral markings ( Fig. 2b ). Similar markings also occur in E. breviceps and E. similis but the first intervals are yellowish from scutellum to apex and the large dorso­lateral yellowish marks are unique to E. stockwelli . This species is closely related to E. breviceps and has very similar aedeagal structure but the rounded knoblike apex of the ventral plate of the median lobe in E. stockwelli is distinct (compare Figs. 9 and 10 ). Vogt (1992) listed this species as Euscelus sp. nr. breviceps Sharp and associated it with Terminalia amazonica (sic) in the Combretaceae . He gave its range as lowlands to 1,000 m in Honduras and the Republic of Panama. No specimens from Honduras were found in the Vogt material. Vogt also listed a bicolored pterocoline egg predator, Pterocolus auricollis Sharp , associated with this species. Stockwell collected this species on Terminalia amazonia (Gmel.) in Panama. The species is named in honor of Henry P. Stockwell whose collections have made a significant contribution to weevil taxonomy.

Figures

Figs. 1–6. New species of Euscelus, males,16X; left profemur (a) and dorsal habitus (b). 1) E. oaxacensis; 2) E. stockwelli; 3) E. similis; 4) E. spinosus; 5) E. bivittatus; 6) E. maculicollis.

Figs. 8–11. Species of Euscelus, male genitalia, dorsal view, 64X; tegmen (a) and median lobe (b) with endophallic sac in repose. 8) E. oaxacensis, n. sp.; 9) E. stockwelli, n. sp.; 10) E. breviceps (Sharp); 11) E. similis, n. sp.

Fig. 15. Distribution of Euscelus n. spp. E. oaxacensis [black squares], E. stockwelli [black circles], E. similis [black triangles].