Chrysina lacordairei (Boucard, 1875)

(Figures 5, 18, 22, 23)

Plusiotis cosijoezai Ramírez-Ponce and Curoe, 2017 . New synonymy.

This is a common species that has been collected in various localities in the states of Guerrero and Oaxaca in Mexico. It has been found in oak and pine-oak forests at elevations between 1100 and 2350 meters above sea level. In the Sierra Azul we found this species in August 2018 in Santa Inés del Monte at 2300 m (1 male and 1 female), and in Santiago Clavellinas in August–September 2018 and July 2019 between 2100 and 2300 m (6 males and 4 females). Plusiotis cosijoezai was described in 2017 from a series consisting of one “male” holotype and seven female paratypes. We herein synonymize this species with C. lacordairei because the holotype “male” designated to typify the species actually is a typical female of C. lacordairei . The “male” holotype photographed for the original description (their Figure 1 a–b) obviously is a female based upon the external characters typical of all females of the Adelaida Group (sensu Hawks 2001). The consistent differences on the ventral surfaces of the male and female abdomen in C. lacordairei are easily observed in Fig. 22 (male) and Fig. 23 (female). The male genital capsule associated with the holotype specimen of C. cosijoezai represents an additional error since it corresponds to the genital capsule of C. adelaida . The erroneous male genitalia of C. cosijoezai in the original description corresponds well to that of a C. adelaida male collected in the Sierra Azul in August 2018 (Fig. 19). Chrysina lacordairei adults are known to feed on the leaves of oak trees ( Quercus species) at other localities in Oaxaca and Guerrero (e.g., Boucard 1875).

22) Male. 23) Female.