Phytobia calyptrata (Hendel)

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

Phytobia calyptrata (Hendel)

Figs 679-682

Agromyza nigrisquama Malloch, 1916: 53 [preoccupied by Malloch (1914)].

Agromyza calyptrata Hendel, 1923: 145 [new name]. Frick 1952a: 372.

Phytobia (Trilobomyza) calyptrata . Frick, 1953: 70, 1959: 393.

Phytobia septentrionalis Spencer, 1969: 106. Spencer and Steyskal 1986b [synonymy].

Phytobia calyptrata . Spencer & Steyskal, 1986b: 270.

Description.

Wing length 2.9-3.5 mm (♂♀). Length of ultimate section of vein M4 divided by penultimate section: 1.1-1.2. Costa extending to vein M. Eye height divided by gena height: 3.1-7.0. Frons well-sclerotised and evenly rounded with fronto-orbital plate ill-defined and projecting. Parafacial projecting, venter less pronounced, continuing as narrow cheek on anterior 1/2 of gena; narrow, slightly widened and projecting dorsally. Lunule semi-circular, shallow. Space between antennae ~ 1/3 width of scape. Clypeus narrow and broadly rounded, buccal cavity subquadrate, and length of epistoma 0.2 × width or less. Space between cross-veins longer than length of dm-m, sometimes nearly 1.5 × length of dm-m.

Chaetotaxy: Two ori (sometimes three ori on one side); two ors. Postocellar and ocellar setae well-developed. Orbital setulae reclinate, in one irregular row. One presutural and three postsutural dorsocentrals; slightly decreasing in length anteriorly or with anterior two much shorter, closer in length to surrounding setulae. Small to weak seta medial to long presutural supra-alar. Acrostichal seta slightly thinner than, and nearly as long as fronto-orbitals. One posteromedial seta on mid tibia.

Colouration: Body predominantly dark brown with slight orange-reddish tint that is stronger on antenna, legs and venter of pleuron; body with light greyish brown pruinosity that is greyer and denser dorsally on head and thorax (shinier on ocellar tubercle and in posterolateral corner of frons); dorsum of thorax slightly, and frons sometimes much darker; lunule whitish to beige; parafacial sometimes whitish to beige medially (type specimens Phytobia septentrionalis ); legs brown with base of tibiae slightly yellowish; halter yellow; epandrium sometimes reddish. Calypter margin and hairs dark brown.

Genitalia: (Figs 679-682 ) Hypandrial lobe medially setose and plate-like, nearly separate. Postgonite deeply cleft and upcurved anteriorly. Basiphallus long and narrow, bifid on distal 1/3. Paraphallus sometimes evident as one pair of weak bars. Hypophallus sometimes visible as weak ventral plate. Mesophallus cylindrical with base rounded, slightly longer than wide, entirely fused to distiphallus. Distiphallus tubular and weakly sclerotised, constricted subbasally, widening distally with apex more abruptly expanded; sometimes appearing apically bifid.

Variation: NB female with lunule very shallow, nearly straight along dorsal margin, parafacial thicker and projecting, and dorsocentrals becoming only slightly shorter anteriorly.

Host.

Unknown - possibly Salix ( Spencer and Steyskal 1986b).

Distribution.

Canada: NB*, ON, QC. USA: DC, IL, KS, MD, NY.

Type material.

Holotype [ Agromyza nigrisquama ]: USA. Illinois (1♀, INHS). [Not examined]

Holotype [ Phytobia septentrionalis ]: Canada. QC: Kingsmere, 12.v.1958, CNC Type No. 10389, J.G. Chillcott (1♂, CNC).

Paratype examined

[ Phytobia septentrionalis ]: Canada. ON: Simcoe, 20.v.1939, G.E. Shewell, CNC Type No. 10389, CNC391706 (1♂, CNC).

Additional material examined.

Canada. NB: Kouchibouguac N.P., 24.v.1977, B. Cooper, Code - 5132J, CNC391698 (1♀, CNC), ON: St. Lawrence Is. Nat. Park , McDonald Is., 7.viii.1979, W. Reed, Code 4353.M (1♂, CNC), St. Lawrence Is. Nat. Park, McDonald Is., 21.vii.1976, W. Reid, Code 4166-F, CNC391699 (1♀, CNC), 7.viii.1976, W. Reid, Code 4353-M, CNC391697 (1♂, CNC), Stratford, 15.viii.1959, D.H. Pengelley (7♀, DEBU), Midland, 12.v.1959, J.G. Chillcott, CNC391702 (1♂, CNC), 5.v.1959, CNC391700, CNC391701 (2♂, CNC), Ottawa, damp second growth Acer - Betula wood, 8.vii.2003, J.R. Vockeroth, CNC391705 (1♀, CNC), QC: Duncan Lake, nr. Rupert, 21.v.1971, J.F. McAlpine, CNC391703 (1♂, CNC), 29.v.1971, CNC391704 (1♀, CNC) . USA. MD: Colesville , 24.vii.1974, W.W. Wirth (1♂, USNM) .

Figures

Figures 679 - 682. Phytobia calyptrata (Hendel), male genitalia 679 hypandrium and postgonite, ventral 680 phallus of P. septentrionalis holotype, ventral 681 phallus, ventral 682 phallus of A. calyptrata holotype, left lateral and ventral (from Spencer and Steyskal 1986 b).