Plagiognathus davisi Knight, 1923: 452

SCHUH, RANDALL T., 2001, Revision Of New World Plagiognathus Fieber, With Comments On The Palearctic Fauna And The Description Of A New Genus (Heteroptera: Miridae: Phylinae), Bulletin of the American Museum of Natural History 2001 (266), pp. 1-267 : 67

Plagiognathus davisi Knight, 1923: 452 (n. sp.).

DIAGNOSIS: Recognized by the suberect, silvery, shining vestiture of dorsum appearing somewhat bristly (fig. 3C), the small eyes (fig. 3A), the transversely rugose pronotum, antennal segment 2 usually mostly pale except at extreme base (fig. 16) and only slightly longer than the width of head, the entirely pale legs, and the head projecting well beyond anterior margin of eyes (fig. 3A). Most similar in the form of the head, coloration and length of antennal segment 2, and dorsal vestiture to syrticolae , but distinguished by its smaller size, pale legs, and form of male genitalia (compare figs. 22 and 32). Antennal segment 1 usually mostly pale in davisi , whereas always completely dark in syrticolae (figs. 16, 19).

REDESCRIPTION: Male: Elongate, nearly parallel­sided, small; total length 3.10–3.54, length apex clypeus–cuneal fracture 2.27– 2.49, width across pronotum 1.02–1.11. COLORATION (fig. 7): Dorsum deeply and uniformly castaneous, never with pale markings; membrane and veins fumose, except veins along posterior margin of cells pale; antennal segment 1 usually pale except for castaneous basal ring and dark spots at bases of mesial spine, sometimes mostly dark, segment 2 usually dark only at extreme base and weakly darkened at apex with remainder of segment pale (fig. 16), sometimes remainder of segment weakly infuscate, segments 3 and 4 pale; labial segment 1 castaneous, remain­ der of labium varying from pale to largely infuscate; venter, including metathoracic scent­gland evaporatory area, entirely castaneous; legs pale, white to golden, coxae sometimes partially infuscate basally and hind femora with some dark markings; tibial spines with small dark spots at bases; tibiae dark at articulation with femora. SURFACE AND VESTITURE: Dorsum weakly granular, smooth, weakly shining. Calli demarcat­ ed along posterior margin; pronotum distinctly transversely rugose. Vestiture of dorsum composed of suberect, silvery, shining simple setae, forming distinctive somewhat bristly appearance (fig. 3C, D). STRUC­ TURE: Body elongate, nearly parallel­sided; eyes relatively small (fig. 3A); clypeus prominent, head distinctly protruding anteriorly, anteocular distance 2.0 times diameter of antennal segment 1 (fig. 3A); head projecting below eye by 2.0 times diameter of antennal segment 1 (fig. 3A); labium reaching to about apex of hind coxae; metathoracic scent­gland evaporatory area and spiracle as in figure 3B; pretarsus as in figure 3E. GEN­ ITALIA (fig. 22): Body of vesica more or less J­shaped, base of vesica falling slightly below level of secondary gonopore, posterior apical spine relatively broad, rather strongly curving, obliquely angled relative to body of vesica, anterior spine barely longer than posterior and at nearly right angle to body of vesica; flange on vesica relatively narrow, not quite reaching base of gonopore.

Female: Very similar to male in coloration but body much more strongly ovoid in outline. Total length 2.87–3.28, length apex clypeus–cuneal fracture 2.11–2.31, width across pronotum 1.04–1.09.

HOSTS: Potentilla spp. (Rosaceae) . Recorded occurrences from other plants are most likely just sitting records.

DISTRIBUTION: Across Canada from Ontario to British Columbia ; south in the Rocky Mountain system to New Mexico, and in the eastern United States known from Iowa and Minnesota .

SPECIMENS EXAMINED: CANADA.— British Columbia : 3 mi W of Rock Creek, June 7, 1959, E. E. MacDougal, Potentilla sp. (Rosaceae) , 73, 4♀ (CNC). 7 mi W of Bridgeville, June 28, 1966, W. Gagne and J. Haddock, 23 (UCB). Rock Creek, June 7, 1959, L. A. Kelton and R. E. Leech, Potentilla milligrama (Rosaceae) , 10♀ (CNC). Manitoba: 10 mi W of Roblin, June 15, 1954, Brooks and Wallis, 23 (CNC). 30 mi W of Roblin, July 13, 1954, Brooks and Wallis, 23, 8♀ (CNC). 5 km N of Spirit Sands, Spruce Wood Prov. Park, July 8, 1990, M. D. Schwartz, Hamamelis virginiana (Hamamelidaceae) , 13 (CNC). Aweme, June 10, 1919, N. Cridle, 13, 1♀ (CNC). W of Carberry, 1.0 km SE of jct Hwys 1 and 361, July 8, 1990, M. D. Schwartz, 1♀ (AMNH). Ontario: Middleville, August 7, 1980, D. J. E. Brown, 13, 1♀ (CNC). Saskatchewan: Broadview, July 10, 1957, A. R. Brooks, 13, 1♀ (CNC). Christopher Lake, July 15, 1959, A. and J. Brooks, 1♀ (CNC). Lebret, July 5, 1951, L. A. Konotopetz, 1♀ (CNC). Prince Albert, July 23, 1959, A. and J. Brooks, 1♀ (CNC). USA.— Colorado: Boulder Co.: 4 mi NW of Boulder, June 8, 1961, B. H. Poole, 1♀ (CNC). Boulder, 5500 ft, June 9, 1961, B. H. Poole, 23 (CNC). Nederland, Science Lodge, 9000 ft, July 29, 1960, J. R. Stainer, 1♀ (CNC). Douglas Co.: Waterton, June 10, 1982, D. A. Polhemus, Potentilla sp. (Rosaceae) , 83, 5♀ (JTP). Gilpin Co.: Pinecliffe, July 9, 1949, R. H. Beamer, 13 (KU). Larimer Co.: 40 mi W of Fort Collins, Bennett Crk. Pic. Grd., Pingree Pk. Rd., 7400 ft, July 14, 1986, R. T. Schuh and J. T. Polhemus, 33, 3♀ (AMNH). Fort Collins, 16 mi NW Buckhorn Mt., June 22, 1966, 13 (TAMU). Rocky Mountain National Park, 8500 ft, July 20, 1965, M. H. Sweet, 1♀ (TAMU). Unknown Co.: Little Beaver Creek, July 11, 1937, R. H. Beamer, 13 (KU). Iowa: Boone Co.: Pilot Mound, June 1, 1957 – June 10, 1962, J. C. Schaffner, Potentilla arguta (Rosaceae) , 203, 12♀ (TAMU). Pilot Mound, June 13, 1953, J. C. Schaffner, 23, 9♀ (AMNH). Pilot Mound, June 19, 1962, H. H. Knight, Potentilla arguta (Rosaceae) , 1♀ (CNC). Pilot Mound, June 30, 1962, H. H. Knight, Potentilla arguta (Rosaceae) , 13, 1♀ (USNM). Story Co.: Ames, August 30, 1953, J. C. Schaffner, 13 (TAMU). Ames, July 10, 1943, H. H. Knight, 13 (USNM). Ames, July 14, 1926, G. H., 1♀ (CNC). Ames, June 28, 1951, J. L. Laffoon, 13 (AMNH). Maine: Butler Co.: Augusta, June 26, 1941, A. E. Brower, 13 (USNM). Minnesota: Ramsey Co.: No specific locality, June 15, 1923, H. H. Knight, Ulmus sp. (Ulmaceae) , 33, 3♀ (USNM). Montana: Gallatin Co.: Earthquake Lake, July 26, 1966, W. Gagne and J. Haddock, 1♀ (PDA). New Mexico: Otero Co.: Cloudcroft, June 27, 1949, L. J. Lipovsky, 13, 2♀ (KU). Taos Co.: Tres Ritos, July 25, 1968, J. C. Schaffner, Potentilla fruticosa (Rosaceae) , 43, 2♀ (TAMU). New York: Unknown Co.: Pine Island, June 20, 1912, W. T. Davis, holotype female (USNM). Wyoming: Park Co.: Yellowstone National Park, August 9, 1927, H. H. Knight, 13 (CNC).