Euphoria humilis Blanchard, 1850

Orozco, Jesús, 2012, Monographic Revision of the American Genus Euphoria Burmeister, 1842 (Coleoptera: Scarabaeidae: Cetoniinae), The Coleopterists Bulletin (mo 11) 66, pp. 1-182 : 78-79

Euphoria humilis Blanchard, 1850

(Appendix 4: Fig. 43 )

Euphoria humilis Blanchard 1850: 13 . Original combination.

Holotype at MNHN, examined.

Euphoria nigriventris Bates 1889: 371 New synonymy.

Lectotype at BMNH designated by Hardy (2001), not examined. Three paralectotypes at BMNH, one examined.

Euphoria atra Bates 1889: 371 New synonymy.

Lectotype at BMNH designated by Hardy (2001), examined. One paralectotype at BMNH, not examined.

Description (n = 76). Length 10.5–13.8 mm; width 6.2–8.1 mm. Color: Dorsal surface yellowish brown, usually tomentous in males, shiny in females. Pronotum vittate in males, entirely black in females; males with 2 longitudinal, black vittae and 1 small, dark, semicircular, anterolateral mark at each side. Elytra yellowish brown with black markings; markings frequently covering elytra entirely in females. Ventral surface, including legs, light brown to black. Melanistic forms observed. Head: Frons frequently moderately raised at middle, densely punctate; punctures round, deep, moderate in size, occasionally confluent, moderately densely to densely setose; setae, yellowish, moderate to long. Clypeus subrectangular, surface as on frons, sides subparallel, weakly to moderately raised, apex vaguely to weakly reflexed, moderately sinuate. Antennal club slightly shorter than stem in males, much shorter in females. Pronotum: Surface moderately densely punctate, anterolateral margins with sparse rugae; punctures round to lunulate, small to moderate, sparsely to moderately densely setose; setae short to moderate, yellowish. Sides weakly to moderately angulate. Base in front of scutellum weakly to moderately emarginate. Scutellum impunctate to sparsely punctate; punctures minute, bearing setae. Elytra: Surface moderately densely to densely punctate; striae bearing 2, densely punctate, lateral rows and 1 sparsely punctate medial row; punctures small to moderate, lunulate, geminate, and double grooves in lateral rows, only lunulate in medial row; apex and posterior end of sides rugose. Pygidium: Surface subconcentrically striate; striae dense, discontinuous, moderately to densely setose, setae short to moderate. Legs: Protibiae slender in males, robust in females, teeth equidistant or apical and medial teeth closer to each other than to basal tooth; teeth frequently strongly oblique, basal tooth frequently subobsolete. Meso- and metatibial carinae moderately developed in males, strongly developed in females. Metatibiae moderately to strongly expanded in females at apex, metatarsi longer than metatibiae in males, shorter in females. Venter: Mesometasternal process moderately compressed laterally, extending anteriorly to same level as mesocoxae or slightly beyond. Mesepimera, metasternum, and metacoxae setose, setae as on legs. Metasternum rugose, moderately to densely setose laterally, weakly to moderately punctate and setose at middle, median sulcus strongly impressed. Abdomen in lateral view flat in males, strongly convex in females. Male genitalia: Parameres as in Fig. 43c .

Diagnosis. This species is separated from other species in the group by the following combination of characters: subrectangular clypeus; clypeal sides weakly to moderately raised, clypeal apex vaguely to weakly reflexed; antennal club shorter than stem in both sexes (slightly shorter than stem in males, much shorter in females); double grooved elytral striae; oblique protibial teeth; and form of the parameres.

Taxonomic History. Blanchard (1850) described the species from a female specimen from “ Mexico ”. Bates (1889) described E. nigriventris based on eight males from Jalapa, Etla, and Peras, all Mexico, and E. atra based on three males from Peras and Oaxaca, Mexico. Euphoria nigriventris and E. atra constitute intraspecific variation of E. humilis . Bates’ (1889) observations on the differences between these two species were all based on sexually dimorphic characters and color variation. Based on the examination of 76 specimens, including the types, I place E. nigriventris and E. atra in synonymy with E. humilis .

Natural History. Adults have been captured on Acacia sp. and are known to occur between 1,767–2,400 m elevation.

Temporal Distribution. June (23), July (30), August (1) ( Fig. 43e ).

Geographic Distribution. Known from Chiapas, Oaxaca, and Puebla, Mexico ( Fig. 43f ).

Specimens Examined (76). Type material: Euphoria humilis Blanchard, 1850 ; holotype female at MNHN labeled “18/ 42// Euphoria / humilis/ Blanch// MUSEUM PARIS / MEXIQUE/ GIESBREGHT 1842// TYPE// C. humilis ,/ Blanch./ Mexique / M. M. Giesbreght et Sallé” and my holotype label. Euphoria nigriventris Bates, 1889 ; paralectotype male at BMNH labeled “PARA-/ LECTO-/TYPE// SYN-/ TYPE//Etla// Mexico // Salle Coll// Euphoria / nigriventris/ Bates.// B.C.A. Col., II(2)./ Euphoria // PARALECTOTYPE / Euphoria / nigriventris/ Bates”. Euphoria atra Bates, 1889 ; lectotype male at BMNH labeled “LECTO-/TYPE/ SYN-/TYPE// Oaxaca,/ Mexico./ Hoege// B.C.A. Col., II(2)./ Euphoria / atra, Bates // LECTOTYPE / Euphoria / atra/ Bates = By/ A.R. Hardy, 78”. Other material: MEXICO (70): CHIAPAS: Arriaga (5), Navenchauc (3), Rincón las minas (1); OAXACA: Díaz Ordaz (2), La Cumbre (4), Matatlán (1), Mitla (9), Monte Albán (16), Nejapa de Madero (1), Oaxaca (12), Tapanatepec (1), Teotitlán (4), Tlacolula (6), no data (1); PUEBLA: Acatepec (3), Tlacotepec (1); NO DATA: “ Mexico ” (3).

Figures

Fig. 43. Euphoria humilis. a) Habitus of male, b) Head, c) Parameres, d) Female, e) Temporal distribution, f) Geographic distribution in Mexico.