Phalaecus lineatus Grazia 1983

Phalaecus lineatus Grazia, 1983 (Figs 1C; 2 H-J)

Phalaecus lineatus Grazia, 1983: 186.

MATERIAL EXAMINED. — French Guiana. 60 specimens: 18 ♀, 42 ♂. Maripasoula, massif du Mitaraka, c. 2°14’N, 54°27’O, 25.II-26.III.2015, La Planète Revisitée – MNHN / PNI Guyane 2015 (APA 973 -1), MNHN, UV-MV light trap, 25.II.2015, 1 ♂, coll. RL; Polyvie trap (pink LED), 3.III.2015, 7 ♂, coll. RL; GemLight trap (UV & green LED), 7.III.2015, 2 ♂, coll. RL; Polyvie trap (pink LED), 11.III.2015, 1 ♂, coll. RL; GemLight trap (UV & green LED), 13.III.2015, 1 ♂, coll. RL; Polyvie trap (pink LED), 20.III.2015, 5 ♂, 1 ♀, coll. RL; Polyvie trap (pink LED), 21.III.2015, 9 ♂, 1 ♀, coll. RL; GemLight trap (UV & green LED), 21.III.2015, 3 ♂, 2 ♀, MNHN; Polyvie trap (pink LED), 25.III.2015, 7 ♂ et 1 ♀, coll. RL; GemLight trap (UV & green LED), 25.III.2015, 6 ♀, 2 ♂, coll. RL; Polyvie trap (blue LED), 20.VIII.2015, 2 ♂, 2 ♀, MNHN; Polyvie trap (pink LED), 20.VIII.2015, 2 ♂, 2 ♀, coll. RL. — Saül, Point de vue, Polyvie trap (blue LED), 20.II.2017, 1 ♀, coll. RL; Polyvie trap (blue LED) 6.IV.2017, 2 ♀, coll. RL.

DISTRIBUTION. — Surinam: Pepejoe. French Guiana: Maripasoula and Saül (present paper).

DIAGNOSIS. — According to the original description of the male holotype from Surinam by Grazia (1983). Dorsal surface globally pale yellow-ocher as well as legs (Fig. 1C). Pronotum with ten longitudinal lines formed by brownish shallow punctures. Base of scutellum with four longitudinal punctured lines in the continuation of the four central pronotal longitudinal lines, only the two external lines reaching the apex. Corium with irregular punctured network of lines, formed by brownish shallow punctures, leaving large irregular pale yellow-ocher impunctate spots. Connexivum impunctate and almost concolorous, weakly marked alternatively with pale rufous spots. Antennomeres I to IV concolorous, apical half of antennomere V slightly darker.

Genital plates impunctate pale yellow-ocher (Fig. 2J) as well as ventral surface. Gonocoxites 8 oval with a ratio length/width larger than 1.5, reaching the posterior margin of gonocoxites 9. Gonocoxites 9 and laterotergites 9 are on the same plane. Apex of laterotergites 8 conical and very similar to the female of P. pustulatus (Fig. 2D) but slightly more inclined outwardly. Laterotergites 9 narrow, basally covered by gonocoxites 8, so their lateral margins are not protruding over the lateral sides of gonocoxites 8. Proctiger cylindrical.

DESCRIPTION OF FEMALE

Measurements (mm)

Total length: 15.7-17.2; pronotum width (at humeral angles): 9.0-9.6; abdomen width: 10.0-10.9; head length: 1.6-1.9; head width across the eyes: 2.3-2.5; pronotum length: 3.5- 3.6; Antennomeres I: 1.2-1.5, II: 1.6-1.7, III: 2.2-2.6, IV: 3.1-3.3, V: 2.7-2.8.

REMARK

Described previously only from the male holotype collected in 1952, this species is mentioned here for the first time in French Guiana with 60 specimens collected in 2015 and 2017 from two localities (57 from Mitaraka, three from Saül), in- cluding more than twice more males than females (sex ratio close to 2:1). The males may be more attracted by lights than females. Conversely, P. pustulatus sex ratio is close to 1:1. The female of P. lineatus is described here and this species is photographed for the first time.