452 



Wirth and Stone: Diptera 



21. Genital lamellae somewhat triangular in outline .... — 



myosota Osten Sacken (part) 



— Genital lamellae oval in outline 22 



22. Genital lamellae with long, blackish hairs along the 40, 

 inner side and 2 stout, angulated bristles; Tulare 

 County nigrimanus Van Duzee 1921 — 



— Genital lamellae fringed with short, delicate hairs . . 



formosus Van Duzee (part) 41, 



23. Costa greatly enlarged before tip of 1st vein; middle 

 tarsus very long and slender, each segment enlarged 



at tip; face extending below the eyes; San Diego County — 

 appendiculatus Van Duzee 1921 42, 



— Not as above 24 



24. Hind tibia distinctly thickened, mostly black; central — 

 California calif ornicus Van Duzee 1921 



— Hind tibia rather slender, yellow with a black tip; 

 California . . . amnicola Melander and Brues 1900 (part) 43, 



25. Second abdominal segment with a tuft of long yellow 

 hairs on the sides and a shorter and small tuft on 3rd — 

 segment; central and southern California Coast Ranges 44, 



afflictus Osten Sacken 1877 



— Abdomen without such tufts of hairs 26 — 



26. First antennal segment long, thick, densely hairy; Cali- 45. 

 fornia crenatus Osten Sacken 1877 — 



— First antennal segment normal, enlargement at tip of 46, 

 1st vein as long as cross vein; northern and central 

 California idahoensis Aldrich 1893 — 



27. First antennal segment black, at least on upper edge 

 28 47, 



— First antennal segment wholly yellow 34 



28. Hind femur blackened at apex, at least above; Placer — 

 County affluens Van Duzee 1921 



— Hind femur not at all blackened apically 29 



29. Front purple, blue, or violet; California 48, 



ramifer Loew 1861 



— Front green or bronze in color 30 — 



30. Hind femur ciliated on lower inner edge 31 



— Hind femur without cilia 32 



31. Fifth segment of front tarsus notched at tip so as to 

 form 2 nearly equal lobes; northern California 49, 



obcordatus Aldrich 1893 



— Fifth segment of front tarsus with its tip divided into — 

 very unequal lobes; central California 50, 



pollex Osten Sacken 1877 



32. Anterior coxa wholly black — 



amnicola Melander and Brues 1900 (part) 



— Anterior coxa yellowish in front, with a black or green 

 stripe on the outer surface 33 51, 



33. Last 4 segments of front tarsus a little compressed, — 

 black; Humboldt County . . aldrichii Wheeler 1897 (part) 52, 



— All tarsi plain, normal; Alameda and San Diego counties — 



penicillatus Van Duzee 1921 (part) 53, 



34. Arista enlarged at tip; wing with a lobe at tip of 6th 

 vein 35 — 



— Arista plain 36 54. 



35. Genital lamellae large; hind margin of wing with a deep 

 sinus before the lobe at 6th vein; Humboldt and Tulare 

 counties hastatus Loew 1864 (part) — 



— Genital lamellae small; hind margin of wing normal, 

 except for the lobe at the tip of the 6th vein; Placer 55, 

 County comptus Van Duzee 1921 (part) 



36. Basal segment of middle tarsus laterally fringed; 

 Monterey County plumipes (Scopoli) 1763 (part) — 



— Middle tarsus plain; Fresno County 



uxorcula Van Duzee 192 1 



37. First antennal segment wholly yellow 38 56, 



— Antenna black, 1st segment may be yellow with upper 

 edge narrowly black 41 



38. Arista enlarged at tip; wing with a conspicuous lobe — 

 at tip of 6th vein (see couplet 35) 



— Arista plain 39 



39. Front tarsus ornamented 40 



Front tarsus plain; basal segment of mid tarsus fringed 

 with black hairs on both sides 



plumipes (Scopoli) 1763 (part) 



Wing with a projecting lobe at tip of 6th vein; Mono 



County completus Van Duzee 1921 (part) 



Wing without or with scarcely a trace of such a lobe 



Humboldt County sufflavus Van Duzee 1921 



Fifth segment of front tarsus distinctly but only a little 

 enlarged and but little longer than 4th; California 



coquilletti Aldrich 1893 (part) 



Enlargement of 5th segment very conspicuous 42 



Second segment of the anterior tarsus shorter than the 



1st; Sacramento County walkeri Van Duzee 1921 



Second segment of the anterior tarsus as long as or 

 longer than the 1st; Inyo and Yuba counties 



jugalis Tucker 1911 



Antenna black, 1st and 2nd segments may be yellow 



belc 



44 



First antennal segment wholly yellow 51 



Antenna wholly black; central and southern California 



bakeri Cole 1912 



First antennal segment yellow below 45 



Front tarsus ornamented 46 



Front tarsus plain 48 



First and 2nd segments of front tarsus of equal length; 

 central California. . .canaliculars Thomson 1868 (part) 

 Second segment of front tarsus not much more than 2/3 



as long as 1st 47 



Fifth segment of front tarsus only a little enlarged 



coquilletti Aldrich 1893 (part) 



Fifth segment of front tarsus much compressed and 



widened; Los Angeles and San Diego counties 



talus Van Duzee 1921 



Hind femur with a single preapical bristle 



penicillatus Van Duzee 1921 (part) 



The usual preapical bristles ending a row of bristles 

 of increasing length; outer posterior edge of front coxa 

 with a green or blackish streak, sometimes the front 



coxa wholly green 49 



Last 4 segments of middle tarsus compressed 



aldrichii Wheeler 1897 (part) 



Middle tarsus plain as usual 50 



First antennal segment normal in size and with short 



hairs; Sonoma County cavatus Van Duzee 1921 



First antennal segment long, with long bushy hair; 



central and southern California 



consanguineus Wheeler 1899 



Front tarsus ornamented 52 



Front tarsus plain hastatus Loew 1864 (part) 



Hind femur ciliated below 53 



Hind femur without cilia 57 



Hind coxa infuscated on basal 1/2, at least with a 



large blackish spot at base on outer surface 54 



Hind coxa wholly yellow, or nearly so 56 



First 3 segments of front tarsus of nearly equal length, 



3rd being a little the longest 



canaliculatus Thomson 1868 (part) 



Second segment of front tarsus longer than 1st, 3rd very 



much shorter 55 



Genital lamellae truncate at apex, with a short but 

 rather acute point at upper corner; Humboldt and Shasta 



counties grandis Aldrich 1893 



Genital lamellae with a long acute point in the center 



of apical margin; Monterey County 



superbus Van Duzee 1921 (part) 



Costa with a small, short enlargement at tip of 1st vein; 

 3rd and 4th veins parallel at their tips; Shasta County 



cuprinus Wiedemann 1830 



Costa considerably enlarged at tip of 1st vein, tapering 

 to its tip; 3rd and 4th veins approaching each other 



toward their tips; Inyo County 



subcostatus Van Duzee 1930 



