Alcathousiella polyrhaphoides ( White, 1855 )

Nascimento, Francisco E. de L., Monné, Miguel A. & Wappes, James E., 2021, A review of the genus Alcathousiella Monné, 2005 (Coleoptera, Cerambycidae), European Journal of Taxonomy 757 (1), pp. 37-49 : 45-47

Alcathousiella polyrhaphoides ( White, 1855)

Figs 5–8 , 9–11, 13–15 , 19

Alcidion polyrhaphoides White, 1855: 394 .

Amniscus polyrhaphoides – Bates 1863: 103. — Lacordaire 1872: 762.

Alcathous polyrhaphoides – Thomson 1864: 24. — Chemsak et al. 1992: 133.

Differential diagnosis

This species is characterized by the triangularly projected ( Fig. 15 ) outer angle of elytra, protarsomeres in males with dense, longer blackish setae ( Fig. 11 ), and by the thicker femoral claves.

Material examined

COLOMBIA • 1 ♂; Huila, Municipio Palestina PN, Guacharos, Purce ; 01º40′25″ N, 76º13′29″ W; 2200 m a.s.l.; Viktor Sinyaev leg.; MZSP • 1 ♀; Valle del Cauca, 4 km NW San Antonio; 6500 ft; 20 Oct. 1958; A.H. Miller leg.; EMEC .

VENEZUELA • 1 ♂; Aragua, Rancho Grande ; 1100 m a.s.l.; 25–26 Jan. 1978; J.B. Heppner leg.; cloud forest; blacklight trap; USNM • 1 ♂; same collection data as for preceding; 17–20 Jan. 1978; USNM • 1 ♂; same collection data as for preceding; 8 May 1973; Günther Ekis leg.; USNM • 1 ♂; same collection data as for preceding; 30–31 May 1988; M. Epstein leg.; UV light trap.; USNM • 1 ♂; same collection data as for preceding; 7 Sep. 1967; J. Salcedo and L. Rodriguez leg; MZSP • 1 ♀; Aragua, Geremba ; 2050 m a.s.l.; 14 Jun. 2008; R. Rouche leg.; AACP • 1 ♂; same collection data as for preceding; 18 Oct. 2010; R. Rouche leg.; AACP • 1 ♂; same collection data as for preceding; 13 May 2016; AACP • 1 ♂; same collection data as for preceding; 15 Nov. 2017; R. Rouche leg.; AACP .

BOLIVIA • 4 ♂♂; Santa Cruz, Refugio Los Volcanes ; 3400–4200 ft; 18º06′ S, 63º36′ W; 16–20 Sep. 2012; Wappes, Skelley, Bonaso and Hamel leg.; ACMT • 1 ♀; same collection data as for preceding; 15 Sep. 2012; ACMT • 1 ♀; same collection data as for preceding; 25 Oct. 2011; FWSC • 1 ♂; same collection data as for preceding; 27–28 Oct. 2011; ACMT • 2 ♂, 1 ♀; 4 km N of Bermejo, 1045– 1350 ft, 18°06′ S, 62°36′ W, 17–24 Oct. 2014; ACMT • 1 ♂; same collection data as for preceding; 1000–1200 m a.s.l.; 18°06′ S, 62°36′ W; 29 Oct. 2011; Wappes and Skillman leg.; ACMT • 1 ♂, 1 ♀; same collection data as for preceding; Skillman and Wappes leg.; FWSC • 3 ♂♂; same collection data as for preceding; 12 Dec. 2012; Skillman and Wappes leg.; FWSC • 2 ♂♂; same collection data as for preceding; 4 Dec. 2013; Skillman and Wappes leg.; FWSC • 1 ♀; same collection data as for preceding; 1000–1200 m a.s.l.; Wappes & Skillman leg.; ACMT • 1 ♀; same collection data as for preceding; 16 Dec. 2013; Skillman and Wappes leg.; FWSC .

PERU • 1 ♂; Junín, Satipo, Rio Venado Village ; 2 May 2018; AACP .

Redescription

Male

COLOURATION. Integument mostly brown, darker brown in some areas. Femoral peduncles, mouthparts with yellowish-brown integument (except mandibles dark brown, blackish toward extremities).Anterior sixth of elytra light brown; anterior two thirds mostly brown (especially on the small scattered tubercles); posterior third slightly yellowish green (vide variability).

HEAD. With dense, greyish pubescence, partially obscuring integument. Lower eye lobe at least 1.2 times as tall as genae length. Upper eye lobes separated by 2.5 times the width of an upper eye lobe.

THORAX. Prosternal process about as wide as ¼ the procoxal diameter. Mesoventral process about 0.6 of the mesocoxal diameter. Metaventrite with moderately long and dense greyish setae. Scutellum subrounded apically, covered with greyish pubescence in a median line and fuscous on sides.

ELYTRA. With erect yellowish setae on centro-basal crest; elytral surface deeply punctate; elytral apex with outer angle largely triangle projected, sutural angle with minute projection. Pubescence as follows: greyish white band, from humeri converging posteriorly towards suture at elytral middle (not reaching it), with a narrowed band converging forward (reaching suture) forming a W-shaped area; greyish band diverging from angles of W-shaped area to posterior third, towards epipleura; epipleura with small rounded spots of brownish pubescence. Areas between greyish white patch, darkened; posterior third mostly covered by yellowish brown pubescence; with irregular areas of greyish pubescence; elytral fifth with M-shaped area of brownish pubescence.

LEGS. Femora with diameter of clava more than 3 times peduncle diameter; distal half partially covered by greyish pubescence, with a patch of fuscous pubescence; tibiae with greyish pubescence, with a preapical and median ring of fuscous pubescence; metatarsomere I slightly longer than remaining together.

ABDOMEN. Ventrites with greyish pubescence, denser laterally.

Variability

The integument coloration at posterior third of elytra varies from dark to light brown (especially in specimens from Venezuela). Also, the greyish pubescence may be denser in some specimens ( Fig. 10 ). The posterior third of elytra varies from slightly yellowish green to light or darker brown. In some specimens (especially those from Peru and Bolivia) the elytral apex may be more angular but not with

an elongate spine as in A. giesberti sp. nov. The posterior M-shaped fascia on elytral fifth is reduced to a transverse band. The femoral peduncles vary from brown to yellow in colour.

Measurements (in mm)

Male/female: total length, 7.7 – 11.2 / 7.0 – 9.0; prothorax length, 1.2 – 2.6 /1.4 – 2.5; prothorax width, 2.0 – 3.5/ 1.9 – 2.8; elytral length, 5.2 – 8.0 /5.6 – 6.2; humeral width, 3.0 – 5.0/ 3.4 – 4.0.

Distribution

Known from Ecuador and Venezuela; herein it is recorded from Bolivia, Colombia and Peru (new country records) ( Fig. 19 ).

Figures

Figs 1–8. 1–4. Alcathousiella giesberti sp. nov. Holotype, ♂ (FSCA). 1. Dorsal habitus. 2. Ventral habitus. 3. Lateral habitus.4. Head, frontal view.5–8. Alcathousiella polyrhaphoides White, 1855. Males from Bolivia (FSCA). 5. Head, frontal view. 6. Dorsal habitus. 7. Ventral habitus. 8. Lateral habitus.

Figs 9–18. 9–11, 3–15. Alcathousiella polyrhaphoides (White, 1855) (FSCA). 9–10. Elytral pubescence pattern. 9. Male 1. 10. Male 2. 11. Detail of protarsomeres. 13. Slide of one of the syntype specimens (BMNH), deposited at Coleção de Imagens de material-tipo J.S. Moure (DZUP). 14. Male antennomere III with internal spine. 15. Detail of distal ⅓ of elytra. 12, 16–18. A. giesberti sp. nov. (FSCA). 12. Detail of protarsomeres. 16. Detail of distal third of elytra. 17. Male genitalia in lateral view. 18. Schemes of male genitalia: A= median lobe in dorsal view; B = median lobe in lateral view; C = tegmen in dorsal view; D = tegmen in lateral view; E = sternite VIII. Abbreviations: ap = apophysis; ar = arms; ba = basal apophyses; pa = parameres; ri = ring part; ro = roof; ts = tegmen struts.

Fig. 19. Map showing the known distribution of species of Alcathousiella Monné, 2005.