Agromyza kincaidi Malloch, 1913

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Agromyza kincaidi Malloch

Figs 39 , 40 , 193-197

Agromyza kincaidi Malloch, 1913: 285. Frick 1952a: 372 [as synonym of ambigua Fallén]; Spencer 1969: 45; Spencer and Steyskal 1986b: 264.

Description

(Figs 39 , 40 ). Wing length 3.6-4.0 mm (♂), 3.9-4.3 mm (♀). Length of ultimate section of vein M4 divided by penultimate section: 0.7-0.8. Eye height divided by gena height: 2.9-3.2. First flagellomere small and rounded with small apical tuft of pale hairs. Ocellar triangle 1/2 length of frons, shape equilateral or more tapered apically. Buccal cavity subquadrate and clypeus broad. Costa only extending to R4+5. Thorax with light pruinosity.

Chaetotaxy: Two ori; two ors. Four postsutural dorsocentrals, one presutural, decreasing in length anteriorly. Mid tibia with two posteromedial setae.

Colouration: Body dark brown with halter white. Gena slightly paler posteriorly. Fore tarsus, apex of fore femur and base of tibiae yellowish. Wing veins light brown. Calypter margin and hairs white. Female fronto-orbital plate slightly paler and less pruinose.

Genitalia: (Figs 193-197 ) Surstylus not strongly differentiated from epandrium, which has deep desclerotised anteroventral emargination; with numerous posterior and medial tubercle-like setae and with rounded inner-distal point bearing several small setae. Hypandrium gently arched, not produced apically; inner lobe largely membranous and with two furrows ending in one setula each. Postgonite small, flat and lobate. Halves of basiphallus folded inwards near apex; right sclerite shorter and fused to enlarged distal margin of phallophorus. Distiphallus of " Agromyza nigripes -type" (capsule-shaped with subbasal opening for entry of ejaculatory duct, pronounced dorsobasal collar, and medial convolution); distal portion dark and extremely elongate with wide ventral furrow (dark medial ridge within furrow); inner surface with pronounced spinulose ridge; dorsal surface covered by dark membranous sheath. Ejaculatory apodeme broad and well-developed with distal margin pale and rib pronounced.

Host.

Unknown - likely a grass-feeder, possibly on Bromus purgans ( Spencer and Steyskal 1986b).

Distribution.

Canada: AB, BC, MB, NL, NS, YT. USA: AK, CA, CO, IA*, NC*, NY*, TN, UT.

Type material.

Holotype: USA. AK: Juneau, 25.vii.1899, Kincaid (1♀, USNM; type No. 15565).

Additional material examined.

Canada. AB: Banff, Johnston Canyon, 1432 m, 18.vii.1962, K.C. Herrmann, CNC352900, CNC352937 (1♂, 1♀, CNC), 30-31.vii.1962, CNC352938 (1♀, CNC), Banff , 19.vii.1922, E. Hearle, CNC353102 (1♂, CNC), Calgary , 20 mi W, Jumping Pd. Cr., 9.viii.1962, K.C. Hermann, CNC352901 (1♂, CNC), Wate [illegible], 15.vii.1923, H.L. Seamans, CNC352903 (1♂, CNC), BC: Bowser , 8.vi.1955, R. Coyles, CNC352936 (1♀, CNC), Kleanza Cr., 14 mi E Terrace, 4.vii.1960, C.H. Mann, CNC352942 (1♀, CNC), Mt. Thornhill nr. Terrace , 1066 m, in boggy seepage area, 14.vii.1960, J.G. Chillcott, CNC352933 (1♀, CNC), Pr. Rupert, Ledum - Kalmia bog, 4.iv.1960, R. Pilfrey, CNC352935 (1♀, CNC), 4.vi.1960, C.H. Mann, CNC352896, CNC352897 (2♂, CNC), Robson , 24.v.1950, H.R. Foxlee, CNC352928 (1♀, CNC), Summit Lake , Mi 392 Alaska Hwy., 1280 m, 31.vii.1959, R.E. Leech, CNC352898 (1♂, CNC), Summit Lake , 1280 m, 21.vii.1959, R.E. Leech, CNC352899 (1♂, CNC), Terrace , Airport area , 4.viii.1960, C.H. Mann, CNC352934 (1♀, CNC), Terrace , 11.viii.1960, W.R. Richards, CNC352895 (1♂, CNC), 67 m, 15.viii.1960, B. Heming, CNC352929 (1♀, CNC), 67 m, 8.vi.1960, W.W. Moss, CNC352932 (1♀, CNC), 19.vii.1960, C.H. Mann, CNC352931 (1♀, CNC), 20.vii.1960, W.R. Richards, CNC352885 (1♂, CNC), 31.iv.1960, R.J. Pilfrey, CNC352894 (1♂, CNC), 31.v.1960, C.H. Mann, CNC352930 (1♀, CNC), 31.vi.1960, J.G. Chillcott, CNC353099 (1♂, CNC), MB: Churchill , 14.vii.1952, E.F. Pope, CNC352939 (1♀, CNC), Churchill , 58°46'N, 94°10'W, 5.viii.1952, J.G. Chillcott, project#NBP, CNC_Diptera59120 (1 ex, CNC), Deer River , mile 473 m Hudson Bay Ry. , 3.viii.1952, J.G. Chillcott, CNC352886 (1♂, CNC), Int. Peace Gardens, Turtle Mtn. For. Res., 7.viii.1958, J.G. Chillcott, CNC352940 (1♀, CNC), NL: Bell Is., 4-7.viii.1967, J.F. McAlpine, CNC353108 (1♂, CNC), Lab., Cartwright, 20.vii.1955, E.F. Cashman, CNC352941 (1♀, CNC), St. John's , Agric. Exp. Sta., 1.viii.1967, J.F. McAlpine, CNC353111-353113, CNC353117 (4♂, CNC), 15.vii.1967, J.F. McAlpine, CNC353126 (1♂, CNC), 16.vii.1967, J.F. McAlpine, CNC353124, CNC353110 (1♂, 1♀, CNC), on Ranunculus , 18.vii.1967, J.F. McAlpine, CNC353103-353107 (5♂, CNC), Abies balsamea , 19.vii.1967, J.F. McAlpine, CNC353109 (1♀, CNC), 21.vii.1967, J.F. McAlpine, CNC353131, CNC353135 (2♂, CNC), 24.vii.1967, J.F. McAlpine, CNC353119 (1♀, CNC), 26.vii.1967, J.F. McAlpine, CNC353133 (1♂, CNC), 27.vii.1967, J.F. McAlpine, CNC353128 (1♂, CNC), 29.vii.1967, J.F. McAlpine, CNC353120, CNC353129 (1♂, 1♀, CNC), 3.viii.1967, J.F. McAlpine, CNC353114-353116 (3♂, CNC), 30.vii.1967, J.F. McAlpine, CNC353121, CNC353125 (1♂, 1♀, CNC), 31.vii.1967, J.F. McAlpine, CNC353130 (1♂, CNC), 9.viii.1967, J.F. McAlpine, CNC353118, CNC353122, CNC353123, CNC353127, CNC353132, CNC353134, CNC353136 (4♂, 3♀, CNC), NS: Lockeport, Cranberry I., 24.vii.1958, J.R. Vockeroth, CNC352902 (1♂, CNC), YT: Ogilvie Mts. , North Fork Crossing , 1.vii.1962, P.J. Skitsko, CNC352893 (1♂, CNC), Rampart House, 67°25'N, 140°59'W, 17.vii.1951, J.E.H. Martin, project#NBP, CNC_Diptera109349 (1♀, CNC), Whitehorse, 24.viii.1959, R. Madge, CNC352926, CNC352927 (2♀, CNC) . USA. AK: Anchorage, 18.vii.1951, R.S. Bigelow, CNC352915 (1♀, CNC), Cold Bay, on tundra, 18.viii.1952, W.R.M. Mason, CNC352892 (1♂, CNC), Curry, 29.vi.1952, W.R. Mason, CNC352914 (1♀, CNC), King Salmon, Naknek, 13.vii.1952, J.B. Hartley, CNC352921, CNC352923, CNC352925 (3♀, CNC), 16.viii.1952, CNC352919 (1♀, CNC), 3.vii.1952, CNC352917 (1♀, CNC), 31.vii.1952, CNC352924 (1♀, CNC), 5.viii.1952, CNC352916 (1♀, CNC), 6.vii.1952, CNC352918, CNC352920, CNC352922 (3♀, CNC), Mile 315 Richard. Hwy., 8.vi.1951, W.R. Mason, CNC352913 (1♀, CNC), Naknek, 18.vii.1952, J.B. Hartley, CNC352910, CNC352911 (2♀, CNC), 8.vii.1952, J.B. Hartley, CNC352907 (1♀, CNC), W.R. Mason, CNC352912, CNC352908, CNC352909 (3♀, CNC), CO: Doolittle Ranch, Mt. Evans , 2987 m, 22.vii.1961, J.G. Chillcott, CNC352905 (1♀, CNC), 3.viii.1961, W.R.M. Mason, CNC352888 (1♂, CNC), B.H. Poole, CNC352906 (1♀, CNC), Echo L., Mt. Evans , 3230 m, 25.vii.1961, C.H. Mann, CNC352904 (1♀, CNC), IA: Ames, 10.v.1947, A.R. Brooks, CNC352943 (1♀, CNC), NC: Gt. Smokies, Clingmans Dome, A.L. Melander, 18.vii.1941 (4♂ 3♀, USNM), 19.vii.1941 (4♂, USNM), 21.vi.1941 (1♂, USNM), Smokies, Andrews Bald, 9.vii.1941, A.L. Melander (2♂ 1♀, USNM), Smokies, Forney Ridge, 26.vi.1941, A.L. Melander (1♂, USNM), Clingman’s Dome, Grt. Sm. Mt. Nat. Park , 6.viii.1957, C.J. Durden, CNC352891 (1♂, CNC), 2011 m, 22.viii.1957, J.G. Chillcott, CNC352887 (1♂, CNC), NY: White Face Mt. , 4000', 14.vii.1958, A.L. Melander (1♂, USNM), TN: Indian Gap to Clingman’s Dome, Gr. Sm. Mt. Nat. Park Tenn. , 1584-2011 m, 6.viii.1957, J.G. Chillcott, CNC352889, CNC352890 (2♂, CNC) .

Comments.

Agromyza kincaidi is highly similar in appearance to the European and Nearctic A. ambigua Fallén ( Spencer and Steyskal 1986b: figs 367-369), which has a highly similar phallus, an anterodorsally pointed first flagellomere (sometimes very strongly pointed in A. ambigua ), a costa that extends just past R4+5 and dark colouration. While never directly compared, differentiation between the two has historically relied most heavily on the colour of the calypter margin and hairs, which are supposedly brownish in A. kincaidi and bright white to yellow in A. ambigua ( Spencer 1969); vein colour does not appear to be yellowish in any A. ambigua examined, as noted in Spencer and Steyskal (1986b); examination of specimens further reveals calypter margin/hair colour to range from yellowish to brownish, and is even white in some material identified by Spencer. The limits of these two species should be re-evaluated in the future.

Figures

Figures 37 - 44. 37 Agromyza aristata Malloch, female lateral 38 Agromyza bispinata Spencer, female lateral with detail of stridulatory file 39, 40 Agromyza kincaidi Malloch, male head (arrow indicates discrete apical tuft of hairs) 39 lateral 40 same, anterior 41, 42 Agromyza bispinata, male head 41 lateral 42 same, anterior 43 Agromyza sp., female (S. A. Marshall - Ontario, Hornings Mills) 44 Euhexomyza schineri (Giraud) (T. Murray - Massachusetts, Groton).

Figures 193 - 197. Agromyza kincaidi Malloch, male genitalia 193 hypandrium and postgonite, ventral 194 external genitalia, left lateral 195 external genitalia, ventral 196 hypandrial complex, left lateral 197 phallus, ventral.