Anthomyza macra, Czerny, 1928

Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), Acta Entomologica Musei Nationalis Pragae (suppl.) 56, pp. 1-412 : 111-112

Key to identincation of the Nearctic species of the Anthomyza macra group

1 Male. ........................................................................................................................... 2

– Female. ........................................................................................................................ 4

2(1) Gonostylus suboblong in widest extension outline ( Fig. 231 ); apex of nlum bluntly truncate ( Fig. 229 ); scutellum often medially pale brown to yellow. ............................ ..................................................................................................... A. oblonga sp. nov.

– Gonostylus distally strongly widened in widest extension outline ( Figs 214 , 242 ); apex of nlum lanceolate ( Figs 211 , 246 ); scutellum usually brown (sometimes medially pale brown in A. tenuis ). ..................................................................................................... 3

3(2) Epandrium very large and broad (largest dorsal width of epandrium more than 1.1 times as long as longest eye diameter), with anal nssure small and low ( Fig. 207 ). Gonostylus laterally as large as epandrium ( Fig. 208 ), distally more widened and with small acutely projecting posteroventral corner ( Figs 207, 214 ). Posterior process of pregonite with more (4–5) setae ( Fig. 209 ). Saccus with numerous spines ( Fig. 212 ). Humeral callus usually yellow. ................................................ A. tenuis ( Loew, 1863)

– Epandrium smaller, less broad (largest dorsal width of epandrium less than 0.9 times as long as longest eye diameter), with anal nssure larger and higher ( Fig. 239 ). Gonostylus laterally smaller than epandrium ( Fig. 248 ), distally less widened and with more robust, less pointed posteroventral corner ( Figs 241–243 ). Posterior process of pregonite with only 2 setae ( Fig. 244 ). Saccus with only a few spines ( Fig. 247 ). Humeral callus light brown to brown. ......................................................... A. silvatica sp. nov.

4(1) Preabdominal terga (T2–T5) entirely brown. Pleural part of thorax with dorsal longitudinal brown band wider, usually covering dorsal one-third or more of mesopleuron; humeral callus light brown to brown; scutellum always brown. T7 dorsomedially shortened ( Fig. 249 ), with anterior emargination; T8 transverse and pale ( Fig. 249 ); S8 short, usually with a few setae ( Fig. 253 ). .................................... A. silvatica sp. nov.

– T2–T5 dorsally largely yellow or at least distinctly paler brown than laterally. Pleural part of thorax either entirely yellow or only narrowly brown at dorsal margin of mesopleuron; humeral callus yellow or brownish; scutellum may be medially light brown in A. tenuis to distinctly yellow in A. oblonga . T7 dorsomedially longer, shallowly emarginate ( Figs 216 , 234 ); T8 as long as wide or slightly transverse, narrower posteriorly and darker ( Figs 216 , 234 ); S8 elongate, with more setae ( Figs 217 , 238 ). ............... 5

5(4) Large dorsal yellow parts of T2–T5 usually contrasting with brown lateral parts ( Fig. 232 ). T7 usually shorter and wider and with sides convex to straight ( Fig. 234 ). Annular sclerite strongly bent in pronle ( Fig. 233 ). Spermathecae with basal part markedly narrower, more distinct from wider terminal part which is more densely, nnely ringed ( Figs 235, 237 ). ............................................................................. A. oblonga sp. nov.

– Dorsal yellow to pale brown parts of T2–T5 continuously transitioning to brown lateral parts. T7 usually longer and narrower and with sides concave ( Fig. 216 ). Annular sclerite slightly bent in pronle ( Fig. 218 ). Spermathecae with basal part markedly broader, less distinct from wider terminal part which is less densely, coarsely ringed ( Figs 215, 221 ). ........................................................................ A. tenuis ( Loew, 1863)

Figures

Figs 225–231. Anthomyza oblonga sp. nov., paratype male (Canada: Ontario). 225 – external genitalia, caudally; 226 – the same, laterally; 227 – hypandrial complex, laterally; 228 – transandrium, caudally; 229 – apex of nlum, lateroventrally (widest extension); 230 – aedeagal complex, laterally; 231 – gonostylus,sublaterally (widest extension, micropubescence omitted). Scales = 0.05 mm (Fig. 229) and 0.1 mm (others).

Figs 207–214. Anthomyza tenuis (Loew, 1863), male (Canada: Alberta – Fig. 209 and USA: New York – others). 207 – external genitalia, caudally; 208 – the same, laterally; 209 – hypandrial complex, laterally; 210 – transandrium, caudally; 211 – apex of nlum, subventrally; 212 – aedeagal complex, laterally; 213 – ejacapodeme (widest extension); 214 – gonostylus, sublaterally (widest extension, micropubescence omitted). Scales = 0.05 mm (Fig. 211) and 0.1 mm (others).

Figs 239–243. Anthomyza silvatica sp. nov., paratype male (Canada: Ontario). 239 – external genitalia, caudally; 240 – the same, frontally (setosity of epandrium omitted); 241–243 – variation of gonostylus, sublaterally (widest extension, micropubescence and/or setosity omitted). Scales = 0.1 mm.

Figs 244–248. Anthomyza silvatica sp. nov., paratype male (Canada: Ontario). 244 – hypandrial complex, laterally; 245 – transandrium. caudally; 246 – apex of nlum, subventrally; 247 – aedeagal complex, laterally; 248 – external genitalia, laterally. Scales = 0.05 mm (Fig. 246) and 0.1 mm (others).

Figs 249–255. Anthomyza silvatica sp. nov., paratype female (Canada: Ontario).249 – postabdomen, dorsally; 250 – spermatheca; 251 – distal part of ventral receptacle, sublaterally; 252 – spermatheca; 253 – postabdomen, ventrally; 254 – internal sclerites, ventrally; 255 – female genital chamber and end of postabdomen, laterally. Scales = 0.05 mm (Figs 250–252) and 0.1 mm (others).

Figs 215–221. Anthomyza tenuis (Loew, 1863), female (Canada: Alberta). 215 – spermatheca; 216 – postabdomen, dorsally; 217 – the same, ventrally; 218 – internal sclerites, laterally; 219 – the same, ventrally; 220 – distal part of female genital chamber, laterally; 221 – spermatheca. Scales = 0.2 mm (Figs 216, 217), 0.05 mm (Figs 215, 221) and 0.1 mm (Figs 218–220).

Figs 232–238. Anthomyza oblonga sp. nov., paratype female (Canada: Ontario). 232 – abdomen, dorsally; 233 –female genital chamber and S8 (with setosity omitted), laterally; 234 – postabdomen, dorsally; 235 – spermatheca; 236 – internal sclerites, ventrally; 237 – spermatheca; 238 – postabdomen, ventrally. Scales = 0.3 mm (Fig. 232), 0.05 mm (Figs 235, 237) and 0.1 mm (others).