Euphoria casselberryi Robinson, 1937

Orozco, Jesús, 2012, Monographic Revision of the American Genus Euphoria Burmeister, 1842 (Coleoptera: Scarabaeidae: Cetoniinae), The Coleopterists Bulletin (mo 11) 66, pp. 1-182 : 74-75

Euphoria casselberryi Robinson, 1937

(Appendix 4: Fig. 39 )

Euphoria casselberryi Robinson 1937: 163 . Original combination.

Holotype at USNM, examined.

Description (n = 36). Length 10.7–12.9 mm; width 6.5–7.7mm. Color: Sexually dimorphic. Males: Surface tomentous or shiny, pronotum yellowish brown to orangish brown, pronotum with 1 large black vitta on each side of midline, occasionally covering surface entirely. Elytra yellowish brown to orangish brown, sparse black markings dispersed on humerus and disc. Venter light brown to black. Females: Surface shiny, pronotum black, occasionally with orangish brown markings at apex, base, and sides. Elytra black, occasionally with orangish brown markings dispersed through disc. Venter black. Head: Frons frequently slightly raised at middle, densely punctate; punctures round, deep, moderate in size, sparsely to densely setose; setae yellowish, long to moderate in length. Clypeus subquadrate to subtrapezoidal, laterally expanded in dorsal view, sides flat to slightly raised; apex not raised, sinuate; punctation and setae as on frons. Antennal club slightly shorter than stem in males, much shorter in females. Pronotum: Surface densely punctate; punctures round to lunulate, moderate in size, sides with few rugae, sparsely to densely setose; setae short to moderate, whitish to yellowish. Base in front of scutellum vaguely to weakly sinuate. Sides weakly to moderately angulate. Scutellum sparsely to densely punctate; punctures small to moderate, bearing short to moderately long setae. Elytra: Surface sparsely to moderately densely punctate, striae bearing 2 rows of small, lunulate, punctures or short grooves, sparsely to moderately densely setose; setae short to moderate, whitish to yellowish. Pygidium: Surface subconcentrically striate; striae moderately impressed, evenly spaced, weakly to moderately setose; setae as on pronotum. Legs: Protibiae slender in males, robust in females, teeth equidistant, basal tooth frequently weakly developed. Mesotibial carina strongly developed, carina often ending in 1 or 2 sharp spines. Metatibiae moderately expanded apically in both sexes, metatarsi longer than metatibiae in males, shorter in females. Venter: Mesometasternal process small, strongly compressed laterally, extending anteriorly to same level as mesocoxae. Metasternum rugose, setose laterally, glabrous and impunctate at middle, median sulcus strongly impressed. Abdominal sternites sparsely setose medially, moderately setose laterally, setae moderate in size. Abdomen in lateral view flat to vaguely concave in males, strongly convex in females. Male genitalia: Parameres as in Fig. 39c .

Diagnosis. This species is separated from other species in the group by the sexually dimorphic coloration (elytra yellowish brown in males [ Fig. 39a ], mostly black in females [ Fig. 39d ]), apex of clypeus not strongly reflexed, elytral strial punctation weakly defined (without long grooves or double grooves), protibial teeth perpendicular, and scutellum sparsely to densely punctate and entirely black or with black margins.

Taxonomic History. This species was described from four female specimens collected in the Davis Mountains , Texas, USA.

Natural History. Adults are attracted to light traps. The largest series collected is composed entirely of males that were observed flying close to the ground in the afternoon after the first heavy rain of the season in Texas (Juan Limón and David G. Marqua, personal communication). The species has been collected between 1,700–2,100 m elevation.

Temporal Distribution. June (21), July (1), August (1) ( Fig. 39e ).

Geographic Distribution. Known from southwest Texas, USA and Chihuahua and Durango, Mexico ( Fig. 39f ).

Specimens Examined (36). Type material: Euphoria casselberryi Robinson, 1937 ; holotype male at USNM labeled “TYPE/ Euphoria / casselberryi// Type No. 68658 U.S.N.M// Property of Mark Robinson // M. Robinson Collection 1959// Davis Mtns. Tex/ VI.30.1930/ G.P. Engelhardt ” . Other material: MEXICO (5): CHIHUAHUA. Hidalgo del Parral (1), Primavera (1), Santa Bárbara (1), Santa Clara (1); DURANGO. San Lucas (1). USA (30): TEXAS. Brewster Co.: Alpine (1), Big Bend National Park (2), Davis Co. : Davis Mountains (27).

Figures

Fig. 39. Euphoria casselberryi. a) Habitus of male, b) Head, c) Parameres, d) Female, e) Temporal distribution, f) Geographic distribution in Mexico and the United States.