Proctorus truncatus Lewis & Anderson, 2022

Lewis, Jake H. & Anderson, Robert S., 2022, A revision of the North American genus Proctorus (Coleoptera, Curculionidae, Ellescini) with descriptions of two new species, ZooKeys 1131, pp. 135-153 : 135

Proctorus truncatus Lewis & Anderson sp. nov.

Figs 1A-C , 5 , 7E, F , 8B

Material examined.

Holotype: Canada: Ontario: Constance Bay , 17 May 2003, H. & A. Howden (1 male, CMNC), JHLRSA_PROC_292 . Paratypes: Canada: Alberta: Ghost Dam , 25 May 1983, B.F. & J.L. Carr (1, CNCI), JHLRSA_PROC_299; Tp. 12, Rge. 1, 11 April 1976, B.F. & J.L. Carr (1, CNCI), JHLRSA_PROC_304; Tp. 34, Rge. 4, 21 May 1962, B.F. & J.L. Carr (1, CNCI), JHLRSA_PROC_311; Olds, T.N. Willing (1, USNM), JHLRSA_PROC_328 ; British Columbia: Paul Lake , 24 May 1933, A. Thrupp (3, CAS), JHLRSA_PROC_269 - JHLRSA_PROC_271; Terrace, M.E. Hippisley (1, MCZC), MCZ-ENT00726924 ; Manitoba: Aweme , 5 May 1898 - 12 May 1914, N. Criddle, on Populus (1, CNCI; 2 MCZC), JHLRSA_PROC_306, MCZ-ENT00726919, MCZ-ENT00726920 ; New Brunswick: Northumberland County, Parker, 3 June 1959, on Aspen (1, AFCF), AFCF0019835; York County , Durham, 5 May 1958, G.W. Barter, on Populus tremuloides Michx. (1, AFCF), AFCF0019834; Fredericton, 29 April 1913 (1, CNCI), JHLRSA_PROC_298 ; Ontario: Constance Bay, 17 May 2003, H. & A. Howden (1, CMNC), JHLRSA_PROC_293; Honey Harbor, 10 June 1932, G.S. Walley (1, CNCI), JHLRSA_PROC_305; Lake Superior Provincial Park, Old Woman Bay , 11 June 1973, M. Campbell and R. Parry (1, CMNC), JHLRSA_PROC_295; Lake Superior Provincial Park , Sand River , 6 June 1973, M. Campbell and R. Parry (1, CMNC), JHLRSA_PROC_294; Bell’s Corner, 2 June 1950, S.D. Hicks (1, CNCI), JHLRSA_PROC_297; Rainy River District , 18-20 June 1924, J.F. Brimley (1, CNCI; 1 MCZC), JHLRSA_PROC_309, MCZ-ENT00726925; Rainy River , 11 June 1924, J.F. Brimley (1, USNM), JHLRSA_PROC_326; Sudbury, 1889 (1, CNCI), JHLRSA_PROC_310 ; Quebec: Harrington Lake, 1 June 1954, H.J. Huckel (1, CNCI), JHLRSA_PROC_308; Duparquet, 11 June 1935 - 26 May 1944, G. Stace Smith, on Populus tremuloides Michx. (18, CAS; 2, CMNC; 1, USNM), JHLRSA_PROC_247 - JHLRSA_PROC_266, JHLRSA_PROC_329; St. Rose , 1 June 1939, G. Stace Smith, on Pinus contorta Douglas ex Loudon (1, CAS), JHLRSA_PROC_267; Saint Hyppolyte , Biology station of Laurentides (45.9778°N, 74.0039°W), 3 June 2017, P. de Tonnancour, beaten from Populus grandidentata Michx. (2, CMNC; 8, PdTC), JHLRSA_PROC_272 - JHLRSA_PROC_281; Saint-Pierre, 3 June 1984, C. Chantal, from Populus grandidentata Michx. (2, CMNC; 8, CCCH), JHLRSA_PROC_282 - JHLRSA_PROC_291 ; Saskatchewan: Cut Knife, 29 August 1940, A.R. Brooks (1, CNCI), JHLRSA_PROC_307; Montreal River , 26 May 1954, on Populus (1, CNCI), JHLRSA_PROC_296 ; USA: Michigan: Marquette (1, MCZ (Horn Collection ))), MCZ-ENT00772799 ; Minnesota: “Min.”, H.C. Fall Collection (1, MCZC), MCZ-ENT00726922 ; New Hampshire: Mount Washington (summit), 29 July 1954, Becker, Munroe & Mason (1, CNCI), JHLRSA_PROC_312 ; New Mexico: Santa Fe , 14 June 1935, Van Dyke Collection (1, CAS), JHLRSA_PROC_268 ; New York: Chateaugay Lake , F.C. Bowditch (1, MCZC), MCZ-ENT00726921 ; Utah: Logan , 29 April 1934, T.O. Thatcher (1, USNM), JHLRSA_PROC_327 .

Diagnosis.

Length 3.7-4.0 mm. Body (especially rostrum and femora) dark, although elytra often has orange stripe extending posteriorly from humerus. Protibiae of male not prominently dentate on inner edge. Elytra without clear, distinct x-pattern of white scales. Fifth ventrite of male with two low, minutely serrate ridges apico-laterally, which are connected by a transverse ridge; fifth ventrite also with a single, smaller ventral projection positioned baso-medially. Apical tooth of metatibiae of male straight. Aedeagus with apex dorsoventrally flattened and expanded laterally.

Etymology.

The specific name refers to the truncate ventral projections on the fifth ventrite of males (compare with P. armatus which has long ventral projections).

Ecology.

This species has been collected from Populus grandidentata Michx. and P. tremuloides Michx. The single record of a specimen (JHLRSA_PROC_267) from Pinus contorta Douglas ex Loudon is likely incidental.

Taxonomic comments.

This species was long confused with the less common P. armatus from which it differs in the armature of the fifth ventrite (males), protibia dentation (males), genitalia (males), rostrum length (females) and overall body shape (both sexes). LeConte (1878: 620) wrote of P. armatus (two years after describing that species): "Several specimens of this curious insect were found at Marquette, and among them are ♂♂ in which the two processes of the apical edge of the fifth ventral segment are very short, and scarcely apparent, though the anterior tubercle or spine and the large excavation are as well developed as in the other specimens." Clearly, LeConte is referring to our new species P. truncatus ; however, he apparently assumed that the differences in ventrite armature were cases of intraspecific variation in P. armatus as no additional species were described.

Figures

Figure 1. A-C male Proctorus truncatus fifth ventrite A slightly oblique view B oblique view C ventral (straight-on) view D-F male Proctorus armatus fifth ventrite D slightly oblique view E oblique view F ventral (straight-on) view.

Figure 5. Proctorus truncatus habitus (USI: JHLRSA _ PROC _ 305, JHLRSA _ PROC _ 282) A dorsal (♂) B lateral (♂) C dorsal (♀) D lateral (♀).

Figure 7. Aedeagi of four Proctorus species. Proctorus decipiens (USI: JHLRSA _ PROC _ 035) A dorsal B lateral. Proctorus armatus (USI: JHLRSA _ PROC _ 316) C dorsal D lateral; Proctorus truncatus (USI: JHLRSA _ PROC _ 295) E dorsal F lateral; Proctorus emarginatus (USI: JHLRSA _ PROC _ 325) G dorsal H lateral.

Figure 8. Male protibiae A Proctorus armatus B Proctorus truncatus.