Cyclocephala modesta Burmeister, 1847

Ratcliffe, Brett C., Cave, Ronald D. & Mondaca, José, 2021, The Dynastine Scarab Beetles (Coleoptera: Scarabaeidae: Dynastinae) of Chile, The Coleopterists Bulletin 75 (2), pp. 279-309 : 288-289

Cyclocephala modesta Burmeister, 1847 ( Figs. 14–17 )

Cyclocephala modesta Burmeister 1847: 38 (original combination).

Redescription. Length 10.0– 11.8 mm; width 4.7–6.0 mm. Color of male testaceous except for dark reddish brown or piceous frons; female testaceous except for dark reddish brown head. Head: Frons with small, dense punctures or indistinctly roughened. Clypeus roughened, apex semicircularly rounded or narrowly rounded depending on degree of dorsal view. Interocular width equals 1.5 transverse eye diameters. Antenna with 9 antennomeres, club subequal in length to antennomeres 2–6 in male, shorter in female. Pronotum: Surface with small, moderately dense punctures. Base lacking marginal bead. Elytra: Surface shagreened, punctate-striate, punctures small, shallow. Female epipleuron (ventral view) simple. Pygidium: Surface of male glabrous, strongly shagreened, with minute, dense punctures; female similar but less shagreened. Surface of male convex, weakly convex in female. Legs: Protibia tridentate, all teeth subequally spaced. Male protarsus weakly enlarged; tarsomere 5 four times as long as tarsomere 4; median claw slender, elongate, apex cleft. Female protarsus simple. Metatarsus much longer than metatibia. Venter: Prosternal process minute, nearly obsolete. Parameres: As in Fig. 16 .

Distribution. Cyclocephala modesta is broadly distributed in Brazil, Argentina, Paraguay, Uruguay, and Bolivia ( Endrödi 1966). It was introduced into Chile from Argentina ( Mondaca 2011).

Locality Records ( Fig. 17 ). 10 specimens from SAGC and Mondaca (2011) .

REGIÓN METROPOLITANA DE SANTIAGO (10): CHACABUCO (1): Colina; SANTIAGO (9): Las Condes.

Temporal Distribution. January (1), December (9).

Diagnosis. Cyclocephala modesta is distinguished by the presence of nine antennomeres and the form of the parameres. The larval stage remains undescribed but was incorporated into a key by Morelli and Alzugaray (1994).

Natural History. The specimens from Las Condes were collected at lights in a shopping center in the eastern part of Santiago. Larvae are known to host a thelastomatid parasitic nematode, Leidynema saltense Achinelly and Camino , in their alimentary canal (Achinelly and Camino 2008).

Figures

Figs. 14–17. Cyclocephala modesta. 14) Male; 15) Female; 16) Parameres; 17) Distribution.