Perilampus arasy Yoo and Darling, 2025

Perilampus arasy Yoo and Darling sp. nov.

Figs 15 View FIGURE 15 [♀], 16[♂]

Type Material. Holotype [♀]. Paraguay: Pirapo. " PARAGUAY: Pirapo December 1971 – January 1972. L Peña". The holotype is point- mounted (♀: ROME162301 View Materials - CNC). ROM Online Collection.

Paratypes [1 ♀, 6 ♂]. Brazil: Santa Catarina. Nova Teutônia, 27°11'0"S, 52°23'0"W (1 ♂: F Plaumann, ROME143109 View Materials - NHMUK) GoogleMaps . São Paulo (1 ♀: VN Alin, ROME143093 View Materials - UCDC. 4 ♂: VN Alin, ROME143094 View Materials - UCDC; VN Alin, ROME143095 View Materials - UCDC; VN Alin, ROME143096 View Materials - UCDC; VN Alin, ROME143097 View Materials - UCDC) . Inst. Florestal - Capital , 23°24'S, 46°36'W (1 ♂: EP Teixeira, ROME145009 View Materials - UFES) GoogleMaps .

Description. FEMALE ( Fig. 15 View FIGURE 15 ). Length: 3.3–3.4 mm. Color: head iridescent greenish blue or violet, with black coloration on vertex ( Fig. 15F View FIGURE 15 ); mesosoma and metasoma iridescent greenish blue or violet; clypeus ventral margin black; antenna with scape and pedicel weakly iridescent greenish blue or violet, flagellum dark brown or black, lighter ventrad and distad ( Fig. 15G View FIGURE 15 ).

Head ( Fig. 15E–I View FIGURE 15 ): in dorsal view weakly transverse, width less than twice length, HW/HL about 1.9. Frontal carina: in anterior view straight to weakly sinuate below midlevel of eye; in dorsal view abruptly narrowed V shape around median ocellus, FC/MOD about 1.2 ( Fig. 15E View FIGURE 15 ); distance from lateral ocellus long, FCLO/LOD about 1.0 ( Fig. 15E View FIGURE 15 ). Scrobal cavity ( Fig. 15G View FIGURE 15 ): in anterior view narrow, SW/HW about 0.4. Ocelli ( Fig. 15E View FIGURE 15 ): a line between anterior margin of lateral ocelli nearly bisecting median ocellus. POL/OOL 1.5–1.6. Ocellar ratios LOD: POL: OOL: LOL: 1, 3.0–3.1, 1.8–1.9, about 1.1. Vertex: smooth, without large piliferous punctures. Parascrobal area: in lateral view abruptly narrowed near lower eye margin, 0.2–0.3 EH above lower eye margin ( Fig. 15I View FIGURE 15 ); width wide, PSW/EL about 0.4; sculpture smooth, without large piliferous punctures. Gena: with wide and long smooth area along outer eye margin, striate behind. Malar space: MSL/EH about 0.2. Lower face: with setae sparse laterad torulus, and sparse or dense below. Clypeus ( Fig. 15H View FIGURE 15 ): CW/ CH about 1.4; ventral margin concave; with wide bare area without setae near dorsal margin, often extending ventrad along lateral margin.

Mesosoma ( Fig. 15B–D View FIGURE 15 ): Lateral panel of pronotum: about as wide as prepectus, LPP/PPT 0.8–0.9; without flange or with small, rounded flange below level of mesothoracic spiracle in posterior oblique view ( Fig. 15C View FIGURE 15 ). Mesofemoral depression: smooth. Mesoscutum: punctures angulate, with narrow and weakly coriarious interspaces ( Fig. 15B View FIGURE 15 ); lateral lobe smooth along notaulus; parascutal carina broadly curved, acuminate. Mesoscutellum: apex with inner margins gradually diverging; punctures angulate, with narrow and weakly coriarious interspaces. Axilla ( Fig. 15D View FIGURE 15 ): in lateral view imbricate dorsad, and carinate ventrad.Axillula: smooth dorsad. Fore wing: stigma small, 2.0–2.5× as wide as postmarginal vein width.

MALE ( Fig. 16 View FIGURE 16 ). Length: usually smaller, 3.0– 3.2 mm. As in female, except: Color: mesonotum black. Frontal carina ( Fig. 16B View FIGURE 16 ): distance from lateral ocellus shorter, FCLO/LOD 0.8–0.9. Scape ( Fig. 16F, G View FIGURE 16 ): pits sparse mesad and ventrad, and dense dorsad and laterad, covering about 0.2× scape length.

Etymology. The specific epithet is derived from Arasy, the goddess of the sky in the mythology of the Guarani people, one of the major indigenous groups in South America.

Diagnosis. Perilampus arasy has a parascrobal area that is abruptly narrowed near the lower eye margin ( Figs 15I View FIGURE 15 , 16E View FIGURE 16 ), a narrow frontal carina that is abruptly narrowed around the median ocellus ( Figs 15E View FIGURE 15 , 16B View FIGURE 16 ), a long distance between the frontal carina and the lateral ocellus (0.9–1.0 LOD for females; about 0.8 LOD for males), and an iridescent greenish blue or violet body without cupreous iridescence ( Fig. 15B View FIGURE 15 ).

Distribution. Neotropical: Brazil (Santa Catarina, São Paulo) and Paraguay (Itapúa).

Host association. Perilampus arasy is a hyperparasitoid, parasitizing dipteran parasitoids of Chrysomelidae ( Coleoptera ). Hosts: Tachinidae ( Diptera ). Lydinolydella sp. from Stichotaenia conviva (Stal) ( Chrysomelidae ) ( Teixeira and Casari-Chen 1992).

Remarks. See P. tupa . The only specimen of P. arasy with a host record is ROME189084. This host association with Chrysomelidae will need to be verified by subsequent rearings. Perilampus is rarely associated with Chrysomelidae but has been recorded for P. seneca Yoo and Darling , which are usually hyperparasitoids associated with Lepidoptera ( Yoo and Darling 2024) .