Pachybrachis pima Barney, 2023

Barney, Robert J., 2023, Redescriptions of the Pachybrachis Chevrolat (Coleoptera: Chrysomelidae: Cryptocephalinae) of Arizona, Including New Synonymies, State Records, Plant Associations, and Descriptions of New Species: The Robust Species, The Coleopterists Bulletin 77 (3), pp. 439-459 : 443-446

8. Pachybrachis pima Barney , new species zoobank.org/ urn:lsid:zoobank.org:act:3C9DD298-A671-41B3-9988-A3FD706A2CA0 ( Fig. 2 )

Holotype. Male labeled “ ARIZONA: Pima Co., // Lower Tanque Verde Canyon // 32.25465 -110. 66471 parking // 18.vii.2012 3150’ UV light // Barney, Clark & Riley [printed, white paper] // [circular blue disc signifying dissection by RJB] // HOLOTYPE / Pachybrachis / pima Barney / R. J. Barney 2023 [printed, red paper]”. Deposited in MCZ. The specimen is point-mounted with the genitalia affixed to a second point. It is in excellent condition with all appendages intact. There are ten paratypes (5♂♂ 5♀♀) having identical collecting data as the holotype.

Paratypes. Eighty specimens (35♂♂ 45♀♀; see Specimens Examined) are labeled “ PARATYPE / Pachybrachis / pima Barney / R. J. Barney 2023 [printed, yellow paper]” .

Description. Male. Robust, yellow with brown maculae; L = 3.82–4.42 mm (mean = 4.21 mm, n = 10); W = 2.16–2.65 mm (mean = 2.46 mm, n = 10); L/W = 1.63–1.77 (mean = 1.71, n = 10). Head: Slightly wider than thoracic apex, HW = 1.33–1.65 mm (mean = 1.50 mm, n = 10); eyes narrowly separated, IOD = 0.14–0.21 mm, (mean = 0.17 mm, n = 10), IOD/HW = 0.09–0.14 (mean = 0.11, n = 10); face yellow with brown macula between eyes; no ocular lines; punctation dense in dark areas, sparser in pale areas, antenna yellow, brown, almost reaching elytral declivity. Pronotum: Yellow with brown, M-shaped maculae, not sharply defined; punctation dense in dark areas, more sparsely placed in pale areas; PL = 1.26–1.53 mm (mean = 1.40 mm, n = 10); PW = 1.92–2.42 mm (mean = 2.28 mm, n = 10); PL/PW = 0.59–0.65 (mean = 0.62, n = 10). Elytra: Yellow with extensive brown maculae; striae especially confused in baso-sutural region, most regular laterally and apically. Pygidium: Brown with yellow maculae. Venter: Brown, upper sides of last ventrite yellow. Legs: Yellow with brown spots; front claws appreciably enlarged. Genitalia: Median lobe in en-face view wide, oval OS, with extensive PRL and POL, the post-orificial length ending in a triangular DEO; medial lobe in lateral view with inflated, tubular base, narrowing to terminus. Nineteen males from Arizona and Mexico were dissected.

Female. As in male, except L = 4.28–4.87 mm (mean = 4.56 mm, n = 10); W = 2.46–2.91 mm (mean = 2.66 mm, n = 10); L/W = 1.67–1.80 (mean = 1.72, n = 10); HW = 1.53–1.77 mm (mean = 1.66 mm, n = 10); IOD = 0.20–0.48 mm (mean = 0.33 mm, n = 10); IOD/HW = 0.13–0.27 (mean = 0.19, n = 10).

Remarks. These beetles were assumed to be Pachybrachis snowi Bowditch until the lectotype of P. snowi was examined and dissected. Then it became evident that while closely related, these beetles were not P. snowi . The triangular DEO of P. snowi has extensive POL, while the DEO of P. pima is level with a small extended T.

Etymology. This species was named after Pima County, where a majority of specimens were collected. This also honors the Native Americans from this region, also known as the Akimel O’odham.

Distribution. This species is known from Arizona and northern Mexico.

Biological Notes. Some specimens were collected on Acacia sp. ( Fabaceae ) and some via blacklight in Arizona.

Specimens Examined. Holotype plus 79 paratype specimens. MEXICO: SONORA: Muicipio de Arizpe, Rancho las Playitas , 14.7 km WSW Bacoachi, 30.5711°N 110.1047°W, 1,275 m, 6.vii.2019, T. R. Van Devender and J. D. Palting [1♂ 1♀, BYUC]. USA: ARIZONA: Cochise Co., Pedregosa Mts. , Leslie Canyon NWR, 4,660 ft., 31.5879°N 109.5133°W, 6.viii.2022, R. J. Barney [1♂, RJBC]; Texas Canyon, ex Acacia sp. , 16.vi.2000, F. W. Skillman Jr. [1♂ 1♀, RJBC]; Dragoon Mts. , Middlemarch Pass, 31.vii.2000, F. W. Skillman Jr. [1♂, BYUC]; Guadalupe Canyon, 13.viii.1997, UV light, Skillman and McCleve [1♂, FSCA]; Texas Canyon, 18.vi.2000, ex Acacia, F. W. Skillman, Jr. [1♂, FSCA]; Mohave Co. , 9 mi SE Kingman, 35.1213°N 113.9115°W, 5,315 ft., 5.vii.2010, A. J. Gilbert and N. J. Smith [1♂, AJGC]; Pima Co. , Mt. Lemmon Hwy. , Molino Canyon Overlook, 32.3267°N 110.7003°W, 4,370 ft., 2.viii.2022, R. J. Barney [1♂ 1♀, RJBC]; Santa Catalina Mts., Tanque Verde Trail lot, 3,140 ft., 32.2545°N 110.6646°W, 18.vii.2012, UV light, Barney, Clark and Riley [6♂♂ 7♀♀, HOLOTYPE, RJBC; 1♂, BYUC]; Continental, vii.1976, Dr. Lenczy [1♂ 2♀♀, RJBC]; Arivaca, L. H. Banker [1♂, RJBC]; Redington Road, 16 mi NE Tucson, 3,960 ft., 32.2636°N 110.6465°W, 19.vii.2012, E. G. Riley [1♂ 1♀, RJBC]; Lower Madera Canyon , 10.ix.2019, J. Huether and T. MacRae [1♂, BYUC]; same data, except 23.vii.2019, J. and M. Huether [3♀♀, BYUC]; Pinal Co. , Owl Head Buttes, 14 mi E of Picacho Peak, 2,765 ft., 32°34.603′N 111°07.704′W, A. J. Gilbert and N. J. Smith [3♂♂ 6♀♀, AJGC]; Santa Cruz Co., Peña Blanca Lake , Lower Thumb Picnic Area , 31.4006°N 111.0912°W, 3,860 ft., 3.viii.2022, R. J. Barney [1♂ 3♀♀, RJBC]; Peña Blanca Lake , 18.vii.2003, S. M. Clark and R. C. Mower [1♂ 2♀♀, BYUC]; Greaterville Rd. , 8 mi W SR83, ex Acacia sp. , 18.vii.1999, F. W. Skillman Jr. [1♂, RJBC]; Ruby Road, 1.4 mi W Peña Blanca campground, 31°23′30″N 111°06′ 32″W, UV light, R. H. McPeak and W. B. Warner [1♂, RJBC]; Mustang Mts. , 12.vi.1933, R. H. Beamer [1♂, SEMC]; 4 mi NW Sycamore Canyon on Rt. 39, 4,440 ft., 31°28.1′N 111°13.6′W, 19.vii.2003, S. M. Clark [3♂♂ 12♀♀, BYUC]; 3 mi E Peña Blanca, 19–20.vii.1978, ex Mimosa sp. , A. J. Gilbert [2♀♀, AJGC]; Santa Cruz Co., Harshaw Road, 28.vii.2010, K. E. Schnepp [1♂,

KESC]; Yavapai Co., Prescott , vi–vii.1894 [3♂♂ 6♀♀, MCZ-BOW].

Figures

Fig. 2. Pachybrachis pima, new species, Pima County, Arizona, holotype. A) Dorsal habitus, B) Lateral habitus, C) Face, D) Pygidium, E) Median lobe of aedeagus, lateral view, F) Median lobe of aedeagus, en-face view.