Anticheta, Berg, Knutson, Valley

Pote, Spencer L. & O’Grady, Patrick, 2023, A New Species of Anticheta (Diptera: Sciomyzidae) from Mexico, Zootaxa 5293 (2), pp. 277-293 : 287-288

Key to the Nearctic Species of Anticheta

1. Scutellum with 2 setae. 1 pair of dorsocentral setae. Head and palpi black; 1 pair of fronto-orbital setae; antennae yellowish, aristal hairs short, dense, black. Thorax testaceous; dorsum with 2 broad, blackish vittae joined at anterior margin. Forecoxae whitish; legs yellowish, except for black foretibiae and foretarsi.Abdomen blackish brown. Canada: Ontario. USA: Massachusetts, New Hampshire, New York ( Cresson 1920, Steyskal 1960b). Host species: Unknown................. johnsoni Cresson, 1920

- Scutellum with 4 setae. 2 pairs of dorsocentral setae.......................................................... 2

2. 1 pair of fronto-orbital setae. Head: frons and palpi black; anterior and ventral margins of eyes with pruinose whitish border; antennae yellowish, aristal hairs short, dense, black. Thorax black; forelegs black distad of middle of femur, basal half of forefemur and middle and hind legs yellowish except for brownish 4 th and 5 th tarsal segments.Abdomen black. Canada: Alberta, British Columbia *, Manitoba *, Nova Scotia *, Ontario, Quebec, Saskatchewan *, Yukon *. USA: Alaska, California *, Idaho, Indiana *, Maine *, Michigan, Minnesota *, Montana, Nebraska, New Hampshire *, New Jersey, New York, North Dakota, Ohio, South Dakota *, Utah, Wisconsin, Wyoming ( Foote et al. 1999, Melander 1920, Steyskal 1960b). Host species: Aplexa hypnorum ( Knutson & Abercrombie 1977) ........................................... melanosoma Melander, 1920

- 2 pairs of frontal-orbital setae............................................................................ 3

3. Head: frons blackish, anterior margin slightly to extensively yellow; medifacies black to yellow; anterior fronto-orbital seta 1/2 to 2/3 length of posterior fronto-orbital seta; palpi brown to black; antennae yellow; aristal plumosity short, dense, black. Thorax black. Forelegs black distad of middle of femur; basal portion of forefemur and middle and hind legs yellowish except for brownish 4 th and 5 th tarsal segments. Abdomen black. Canada: Alberta, Manitoba, Ontario, Quebec, Saskatchewan. USA: Idaho, Maine, Michigan, North Dakota, New York, Wisconsin. ( Curran 1923, Steyskal 1960b). Host species: Aplexa sp. (Schorno et al. 2020)............................................................... canadensis Curran, 1923

- Head yellow to testaceous; aristal hairs black. Thorax and abdomen mostly testaceous; dorsum with 2 narrow brown median vittae bordered by broader, pruinose vittae; legs yellowish to testaceous, 4 th and 5 th tarsal segments brownish, forelegs infuscated (tibia and tarsus black in female A. borealis ). Females usually more intensely pigmented than males.................... 4

4. Anterior fronto-orbital seta approximately 1/2 length of posterior fronto-orbital seta. Antenna testaceous, first flagellomere blackish on apical half, more or less; aristal plumosity short, sparse (longest hairs averaging 0.073 mm, range 0.070 –0.075 mm, n=2). Abdomen brown, infuscated; male postabdomen and female terminalia testaceous. Canada: Alberta. USA: Idaho, New York, Ohio. ( Steyskal 1960b). Host species: Lymnaea spp. ( Foote & Keiper 2004).................. fulva Steyskal, 1960b

- Anterior and posterior fronto-orbital setae nearly equal in length................................................ 5

5. Thoracic dorsum mostly testaceous....................................................................... 6

- Thoracic dorsum mostly cinereous blue, with two narrow, brownish vittae........................................ 8

6. Forefemur broadly infuscated black; in lateral view left lobe of epandrium with hooklike projection. Arista with average length of hairs 0.15 mm. Mexico: Michoacán. Host species: Oxyloma tlalpamense cuitseana ........... patzcuaroensis Pote sp. n.

- Forefemur entirely testaceous; in lateral view left lobe of epandrium various, with or without projection but never hooklike. Aristal plumosity with average length of hairs less than 0.15 mm ............................................... 7

7. Epandrium in sinistral view with left lobe extended straight and narrow with rounded tip, right lobe elongate, in lateral view curved somewhat curved, ventrally directed. Medial edge of epandrium above cerci rounded, cerci loosely associated. Sternite five of male elongated in center.Antenna testaceous, 3 rd segment blackish on apical half. Apical plumosity sparse, hairs somewhat longer than in A. fulva , (longest hairs averaging 0.095 mm in length, range 0.09–0.10 mm, n=3). In female, distal 2/3 to 3/4 of foretibia black, proximally dark brown, all tarsi dark brown; in male, distal 1/2 of foretibia light brown, proximal 1/2 of foretarsus testaceous, distal ½ of foretarsus along with other tarsi testaceous. Canada: Quebec, Nova Scotia. USA: California, Idaho, Illinois *, Indiana *, Minnesota * Montana, Ohio, New York, Utah *. ( Foote 1961). Host species: Oxyloma , Catinella ( Robinson & Foote 1978) ................................................................ borealis Foote, 1961

- Epandrium in sinistral view with left lobe blunt and with short, wide, rounded extension, right lobe elongate, in lateral view somewhat curved, dorsally directed. Medial edge of epandrium above cerci pointed, cerci tightly associated. Sternite five of male wide, without elongate central projection. Antenna testaceous, first flagellomere barely tinged with brown on apical half, sometimes testaceous at proximal end. Aristal plumosity sparse, longer than in A. borealis (longest hairs averaging 0.116 mm, range 0.112 –0.127 mm, n=15). In female, distal 2/5 of foretibia dark brown, all tarsi dark brown; in male, distal foretibia barely infuscated, all tarsi light brown. USA: California, Colorado, Idaho, Montana, Oregon, New Mexico, South Dakota, Utah. Mexico: Baja California Norte. ( Melander 1920, Steyskal 1960b). Host species: Oxyloma , Physa , Succinea , Radix , Stagnicola , Pseudosuccinea , Helisoma (Fisher & Orth 1964) ......................................... testacea Melander, 1920

8. Epandrium in lateral view with right lobe extended, barely extending past the rest of the epandrium. Antennae testaceous; first flagellomere usually black on apical half, occasionally only lightly tinged with brown. Aristal plumosity long, sparse (Fisher & Orth 1971), longest hairs averaging 0.128 mm, range 0.120 –0.142 mm, n=16. In male, sides of thorax pruinose whitish except upper half of proepisternum, anepisternum, and anepimeron testaceous. In female, thorax same as in male except katepisternum sometimes cinereous-blue. California, Idaho, Oregon, Washington (see section on variant in Fisher & Orth 1971). Host species: Unknown..................................................................... vernalis Fisher & Orth 1971

- Epandrium in lateral view with right lobe strongly extended, extending almost the same distance away as from the base of the extension to the cerci.Apical 1/2 to 2/3 of first flagellomere lightly tinged with brown; aristal hairs short, sparse (Fisher & Orth 1971), longest hairs averaging 0.062 mm, range 0.055 –0.067 mm, n=7. In male, sides of thorax pruinose whitish, more deeply cinereous-blue than in robiginosa but not as intense as in the female of vernalis ; upper half of proepisternum, anepisternum, and anepimeron testaceous. In female, sides of thorax pruinose cinereous-blue except upper half of proepisternum, anepisternum, and anepimeron testaceous. California, Idaho, Oregon, Washington (see section on variant in Fisher & Orth 1971). Host species: Unknown..................................................................... vernalis Fisher & Orth 1971