Ecclisomyia Banks 1907

Keys to western North American species of Ecclisomyia

Males

1. Inferior appendages each without single black basal spine or mesal stout spines; phallus with pair of distinct sclerotized ventral parameres hooked distally (Figs 1a, 2a)...................................................... E. bilera Denning

- Inferior appendages each with single black basal spine or stout mesal spines (Figs. 10a, 10b, 11b, 22b, 23b, 30b, 31b); phallus with distinct pair of sclerotized parameres rounded distally (Fig. 11a), or with fused parameres (Figs. 23a, 31a)........... 2

2. Inferior appendages each with stout mesal spine (Figs.10a, 11b); phallus with pair of elongate parameres, rounded distally (Figs. 11a)............................................................................ E. conspersa Banks

- Inferior appendages each with 2 or more stout, mesal spines; phallus with shorter and fused parameres (Figs. 22a, 22b, 23a, 23b, 30a, 30b, 31a, 31b)................................................................................ 3

3. Apex of fused parameres with shallow U-shaped mesal indentation; inferior appendages long, lateral sides nearly parallel in ventral view (Figs. 22b, 23b)............................................................. E. maculosa Banks

- Apex of fused parameres with deep U-shaped mesal indentation; inferior appendages short, lateral sides indented basally in ventral view (Figs. 30b, 31b).............................................................. E. simulata Banks

Females

1. Distal margin of tergum X in ventral view with shallow mesal indentation (Figs. 12, 13a); spermathecal sclerite narrow and long (Fig. 13a)........................................................................ E. conspersa Banks

- Distal margin of tergum X in ventral view with V-shaped incision (Figs. 3c, 4a, 4c, 24c, 25b, 32a, 32b); spermathecal sclerite short, rounded, or quadrate (Figs. 4a, 25b, 25c, 32b).......................................................... 2

2. External gonopod of segment VIII longer than wide, its distal margin with shallow concave V-shaped indentation; external gonopod of segment IX broadly concave, without posteriorly directed lobes (Figs. 3b, 4a); spermathecal sclerite rounded (Fig. 3b, 4a)................................................................................ E. bilera Denning

- External gonopod of segment VIII at least as wide as long, distal margin with V-shaped incision (Figs. 25b), convex (Fig. 24c), straight (Fig. 25c), or slightly concave (Fig. 32a); external gonopod of segment IX with deep V-shaped incision, with posteriorly directed lobes (Figs. 24c, 25b, 25c, 32a, 32b); spermathecal sclerite quadrate (Figs, 24c, 25c, 32a, 32b).............. 3

3. External gonopod of segment IX long, narrow, deeply cleft extending posterad about 2 X its width beyond caudal margin of external gonopod of segment VIII (Figs. 24c, 25b, 25c); distal margin of tergum X in ventral view with V-shaped incision for about 3/4 length of tergite (Figs. 24c, 25b, 25c).............................................. E. maculosa Banks

- External gonopod of segment IX short, wide, with V-shaped incision, only extending posterad 1 X its width beyond caudal margin of external gonopod of segment VIII (Figs. 32a, 32b); distal margin of tergum X in ventral view with deep V-shaped incision for about 1/2 length of tergite (Figs. 32a, 32b).......................................... E. simulata Banks

Pupae

1. Apical processes each straight, directed caudad, with 3 long, stout black setae at apex (Figs. 15a, 15b, 16a, 16b, 17a, 17b); lat- eral line gills on segments IIp–IVa (Fig. 42)................................................. E. conspersa Banks

- Apical processes of females curved mesad, of males sometimes straight (Figs. 33a, 33b); each with 2 long stout black setae at apex (Figs. 5a, 5b, 6a, 6b, 7a, 7b, 26a, 26b 27a, 27b, 28a, 28b, 33a, 33b, 34a, 34b, 35a, 35b); without lateral line gills (Fig. 42).................................................................................................... 2

2. Abdominal segment VII without dorsoanterior or ventroanterior gills (Fig. 42)...................... E. maculosa Banks

- Abdominal segment VII with dorsoanterior and ventroanterior gills............................................. 3

3. Dorsal abdominal segment II with anterior gills (Fig. 42)........................................ E. simulata Banks

- Dorsal abdominal segment II without anterior gills (Fig. 42)..................................... E. bilera Denning

Larvae

1. Head, thoracic sclerites uniformly dark brown, without mesal yellow striping....................... E. bilera Denning

- Head, thoracic sclerites with mesal yellowish striping........................................................ 2

2. With lateral line gills on segments IIp–IVa (Fig. 42)........................................... E. conspersa Banks

- Without lateral line gills (Fig. 42)........................................................................ 3

3. Without anterior gills on dorsal and ventral abdominal segment VII; generally lacking dorsoanterior gills on abdominal seg- ment II (Fig. 42)....................................................................... E. maculosa Banks

- With anterior gills on dorsal and ventral abdominal segment VII; with dorsoanterior gills on abdominal segment II (Fig. 42)....................................................................................... E. simulata Banks