Dilychnia disparilis, OLIVIER, 1911

DILYCHNIA DISPARILIS OLIVIER, 1911 View in CoL

( FIGS 13, 23)

D i ly ch n i a d i s p a r i l i s O l i v i e r, 1 9 1 1: 7 4 (d e s c.); McDermott, 1966: 73 (cat.).

Lucidota disparilis ; Blackwelder, 1945: 354.

Type material: Holotype, male examined ( MNHN) ( Fig. 23A). Labels: Dilychnia disparilis Ern. Oliv. [green label]; Chimbo, 1000 ′. VIII.07. Rosenberg. [light brown label] ( Fig. 23B).

Diagnosis: Males with antennomere III exceeding one-third of scape length ( Fig. 13A, B); elytra with lateral margin rounded ( Fig. 13A); sterna VI and VII with rounded light organ spanning one-quarter of its width ( Fig. 13B); sternum VIII posterior margin mucronate with median region projected and rounded, about one-half of length of sternum VIII ( Fig. 13F–I).

Colour pattern: Frons and antenna black, mandibles orange, labial and maxillary palpomere dark brown ( Fig. 13A, B); pronotum with scutellum and elytron orange ( Fig. 13A); elytra orange ( Fig. 13A); proleg with femur orange, and tibia and tarsus black, meso- and metaleg black ( Fig. 13B); abdomen black ( Fig. 13B).

Head: Antenna strongly serrate, the last antennomere filiform, covered with short setae ( Fig. 13A). Labrum projected anteriad, 2× wider than long ( Fig. 23E). Palpi four-segmented: I small and triangular; II 2× longer than I, triangular; III triangular and 2× longer than II; IV stout, subtriangular and 2.5× longer than III. Labium with palpi three-segmented: I and II subequal; III securiform.

Thorax: Pronotum trapezoidal, one-third wider than long, anterior margin with few punctuations, anterior and lateral margins concave, posterior margin with median region rounded and posterior angles projected, obtuse ( Fig. 13A). Hypomeron trapezoidal, 2× wider than long ( Fig. 23D). Scutellum rhombus shaped, acute posteriad. Elytron slightly convex, with lateral margin parallel and basal onethird slightly extended ( Fig. 13A); metafemur slightly thinner than pro- and mesofemora ( Fig. 13B). Tibia covered with short setae. Tarsomere I with lateral margin straight triangular and 2× longer than II; II triangular and 1.5× longer than III; III triangular; claws simple.

Abdomen: Sterna with lateral margin divergent posteriad, posterior angles straight; sterna VI and VII with median region with light organ rounded, less than one-quarter of length of sternum ( Figs 13B, 23F); sternum VIII slightly wider than long, with posterior margin strongly mucronate ( Fig. 13D); pygidium as wide as long, sclerotized, with posterior margin with projected angles and median region slightly rounded ( Fig. 13C); sternum IX with posterior margin rounded and covered with setae ( Fig. 13E).

Aedeagus: Phallobase margin strongly emarginate; paramere apex bent and strongly sclerotized with a membranous projection, posterior margin acuminate ( Fig. 13F–H); phallus extending medially to phallobase ( Fig. 13F); ventral plate with lateral margin sinuose and strongly sclerotized ( Fig. 13I).

Female: Pronotum slightly wider than long; sternum VI with light organ circular, not exceeding half of the height; sternum VII lacking light organs; sternum VIII with lateral margins converging posteriad and posterior margin with median region emarginate; pygidium with posterior margin straight and posterior angles projected.

Remarks: This species can be distinguished from others by its colour pattern, its light orange pronotum and elytron ( Figs 13A, 23C), its strongly serrate and black antennomeres III –X, the eyes smaller than frons height, and sterna VI and VII with circular light organ.

Material examined: COSTA RICA: Guanacaste, Cañas , 14 km, 1 male , 23–31. III .1990 , F. D. Parker ( GMNH), 1 male, 16–23. IV. 1990, F. D. Parker ( GMNH), 1 female , 01–07. V .1990 , F. D. Parker ( GMNH). ECUADOR: Chimbo, 1000 ′, 1 male, VIII , 1907, Rosenberg ( MNHN); Santo Domingo , Pichincha, 1 female , 08–14. V .1988 , Hanson & Bohart ( GMNH);