Gymnetina borealis Warner and Ratcliffe, 2011

Ratcliffe, Brett C. & Warner, William B., 2011, A revision of the genus Gymnetina Casey, 1915 (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini), Insecta Mundi 2011 (173), pp. 1-28 : 6-8

Gymnetina borealis Warner and Ratcliffe , new species

( Fig. 5-10 , 32 )

Type Material. Holotype male, labeled “Oak Creek Canyon, Coconino Co., Ariz., July 20, 1970 // Gymnetis cretacea, Det. M. DeLisle ” and with our red holotype label. Allotype female labeled “Flagstaff, Ariz., 8-11- 35” and with our red allotype label.

Paratypes labeled as follows: “ White Mts. Ariz, DKDuncan Coll//September//D K Duncan Collection” (1 male) ; “base of Pinal Mts, Ariz //May, DKDuncan” (1 male) ; “ Ariz. Oak Cr. Canyon 6000 ft, 25-VII-1936, Owen Bryant ” (1 male) ; “ Prescott Ariz , 8/10/62, R. C. Willis ” (1 male) ; “Arizona VIII-5-1975, ex stock pond on road to Diamond Point lookout off of Control Rd. E of Payson, Gila county // Collector Don Ahart ” (1 male) ; “ Pinal Mts. Ariz., IX-19. 1935, Parker, Lot // F. H. Parker Collection, #13923” (1 female) ; “ Sierra Ancha Mts Ariz// Sep DKDuncan” (1 female)’ “New Mexico. F. H. Snow. ” (2 males) ; “ Water Cyn. 21 Mi. E. (sic; actually west) Socorro , New Mex. , Socorro Co., VIII-15-68, J. Doyen ” (1 female) ; “ Jemez Mts , VII-17 ,

N.M.//Jno. Woodgate Collector//J. W. Green Collection” (1 female); “20miSW. Silver City , New Mex., Grant Co., Aug. 1, 1996, D. W. Sundberg ” (1 female). Paratypes with our yellow paratype labels .

Holotype and allotype deposited at UNSM. Paratypes deposited at ADMC, BCRC, CASC, DNAC, RMBC, SEMC, UAIC, UNSM, and WBWC.

Holotype. Male. Length 22.6 mm; width across humeri 12.9 mm. Color entirely black, shiny, except for the following: pronotum on lateral margin with slender, cretaceous band ( Fig. 6 ). Elytra dark reddish brown, each with small, transverse, cretaceous spot on sides above level of sternite 2 ( Fig. 5 ). Metepisternum with cretaceous spot (dulled by grease) on anterior margin. Sternites 1-4 each with small, transverse, cretaceous spot on posterolateral margin ( Fig. 8 ). Metacoxa with cretaceous spot (dulled by grease) on dorsal edge at front. Head: Lateral margins distinctly elevated. Surface moderately densely punctate; punctures moderate to large, with some minute setae on frons either side of middle. Occiput smooth, shiny. Frons with weak, median, longitudinal tumescence extending to base of clypeus. Clypeus with apex broadly truncate, strongly reflexed, sides distinctly constricted just before antennal insertion. Interocular width equals 4.7 transverse eye diameters. Antenna with 10 segments, club subequal in length to antennomeres 1-7. Pronotum: Surface moderately densely punctate except for disc which is impunctate to sparsely punctate; where dense, punctures mostly large, glabrous. Mesepimeron dorsally and on anterior face rugopunctate, setigerous; setae black, short. Elytra: Surface punctate; punctures round, weakly ocellate, moderately large, glabrous, sparse near suture and becoming progressively denser towards lateral margin where weakly rugose. Apical umbone pronounced. Apices subacutely produced. Pygidium: Surface concentrically rugulopunctate, setigerous ( Fig. 7 ); setae short, dense, black. In lateral view surface weakly convex. Venter: Setae black. Mesometasternal process flat on ventral surface, apex broadly rounded, anterior face sloped at about 45 o to longitudinal axis of body. Abdominal sternites each with moderately dense, large punctures along lateral margin; middle impunctate. Legs: Protibia tridentate, apical 2 teeth slightly closer to one another than is basal tooth to median tooth. Parameres: In ventral view, base of each paramere with small but distinct, basally projecting tooth ( Fig. 9-10 ).

Allotype. Female. Length 20.3 mm; width across humeri 11.3 mm. As holotype except in the following respects: Color: Pronotum on lateral margin with cretaceous band broken. Elytra and pygidium reddish brown. Sternites 1-4 on right side and sternites 1-3 on left side each with small, transverse, cretaceous spot on posterolateral margin. Head: Frons and base of clypeus setigerous; setae sparse, short, reddish brown. Interocular width equals 5.6 transverse eye diameters. Legs: Protibia slightly wider.

Variation. Males (7 paratypes). Length 20.0-23.0 mm; width across humeri 10.5-13.0 mm. As holotype except in the following respects: Color: Pronotum on lateral margin with cretaceous band absent in 1 specimen. Elytra dark reddish brown and with short, transverse, cretaceous band and a small, irregularly shaped cretaceous spot in 2 specimens. Metepisternum completely cretaceous in 2 specimens (New Mexico). Sternites 1-3 with cretaceous spot in 1 specimen. Metacoxa on dorsal edge at front without cretaceous spot in 2 specimens. Head : Surface with sparse, short setae on frons in 2 specimens. Elytra : Surface moderately densely punctate near suture in 1 specimen. Apices acutely produced in 2 specimens (New Mexico). Legs : Protibia with teeth subequally spaced in 3 specimens .

Females (5 paratypes). Length 20.4-23.3 mm; width across humeri 11.3-13.2 mm. As allotype except in the following respects: Color: Pronotum on lateral margin with cretaceous band broader in 2 specimens (New Mexico). Elytra dark reddish brown and with short, transverse, cretaceous band and a small, irregularly shaped cretaceous spot in 3 specimens (New Mexico). Sternites 1-3 with cretaceous spot in 1 specimen and sternites1-4 with cretaceous spot in 1 specimen. Metepisternum with cretaceous spot on anterior margin in 4 specimens. Metacoxa on dorsal edge at front with cretaceous spot in all specimens. Head : Frons lacking setae in 1 specimen (probably worn away). Interocular width equals 5.0-5.6 transverse eye diameters .

Etymology. From the Greek boreios, referring to northern. Hence, the northern Gymnetina in reference to this, the most northerly occurring Gymnetina species.

Distribution ( Fig. 32 ). Gymnetis borealis occurs in the mountains of central Arizona and central and north central New Mexico. 14 specimens examined from ADMC, BCRC, CASC, DNAC, RMBC, SEMC, UAIC, UNSM, and WBWC.

UNITED STATES (14): ARIZONA (9): Coconino Co. (3): Flagstaff, Oak Creek Canyon. Gila Co. (4): Diamond Point Lookout east of Payson, Pinal Mountains, Sierra Ancha Mountains. Navajo Co. (1): White Mountains. Yavapai Co. (1): Prescott. NEW MEXICO (5): Rio Arriba Co. (1): Jemez Mountains. Grant Co. (1): Silver City. Socorro Co. (1): Water Canyon (21 mi. W of Socorro). No Data (2).

Temporal Distribution. May (1), July (3), August (5), September (3).

Diagnosis. Gymnetis borealis is distinguished by greatly reduced pronotal and elytral markings ( Fig. 5 ) and a pygidium lacking cretaceous spots. This species is similar in general appearance to Gymnetina salicis , but, in addition to possessing cretaceous pygidial spots, the parameres in males of that species are proportionately longer and narrower than those of G. borealis (compare Figs. 9 and 30 ).

Biology. Nothing is known of the natural history of this uncommon species. It has been collected in mixed oak, juniper, and pine woodlands.

Figures

Figure 32. Distribution map for Gymnetina species.

Figures 5-10. Gymnetina borealis: 5-6) Dorsal views, showing reduced cretaceous pattern on pronotum, mesepimeron, and elytra as well as sparse, small punctures on pronotal disc. 7) Caudal view showing sculpturing and absence of markings. 8) Oblique ventral view showing broader apex of mesometasternal process and reduced cretaceous spots on sides of abdomen. 9-10) Dorsal and ventral views, respectively, of parameres. Note distinct tooth at base of paramere on ventral side (arrow).

Figures 29-31. Gymnetina salicis, dorsal view. 30-31) Dorsal and ventral views, respectively, of parameres. Note distinct tooth at base of paramere on ventral side (arrow).