398 



Wirth and Stone: Diptera 



gated pastures, brackish marshes, flooded meadows, 



mostly in full sun (fig. 14:17/) dorsalis (Meigen) 



— Dorsal preapical spine of siphon inserted at least its 

 length from apical margin of siphon tube; siphon tuft 

 inserted before middle of inner surface of siphon tube; 

 gills longer than anal segment, sometimes twice as 

 long; upper and lower head hairs almost invariably 

 single; shaded Sierran pools, usually with pine needles 

 communis (Degeer) 



Keys to the California Species of Culiseta 

 Females 



1. Hind tarsus with pale basal bands; wing with distinct 

 scale spots 2 



— Hind tarsus unbanded; wing without distinct scale spots 



3 



2. Hind tarsal bands narrow, that of segment 2 covering 

 about 1/10 of segment; cross veins unsealed; Del Norte 

 County to San Diego County. . .incidens (Thomson 1868) 



— Hind tarsal bands broad, that of segment 2 covering 

 1/4 to 1/3 of segment; cross veins scaled; Humboldt 

 to San Diego counties 



maccrackenae Dyar and Knab 1906 



3. Wing speckled with pale scales, costa with pale scales 

 near base; mid-femur speckled with pale scales in 

 front; dorsum of abdomen brownish, with yellowish 

 basal bands which may cover most of segment; Siskiyou 

 to Imperial counties inornata (Williston 1893) 



— Wing dark scaled, costa dark near base; mid-femur 

 dark scaled in front; dorsum of abdomen black with 

 whitish basal bands; Shasta, Mono, and Mariposa 

 counties impatiens (Walker 1848) 



Male Genitalia 



1. Dististyle about 8 times as long as its median diam- 

 eter; lobes of 9th tergite with many short stout spines 



inornata (Williston) 



— Dististyle more than 10 times as long as its median 

 diameter; lobes of 9th tergite with many slender bristles 



' 2 



2. Basal lobe of basistyle with only a single, rather 

 slender, differentiated bristle; a long row of short 

 spines across apex of 8th segment ventrally 



impatiens (Walker) 



— Basal lobe of basistyle with 2 or 3 stout spines .... 3 



3. Eighth segment ventrally with a median apical clump 

 of 3 to 8 toothlike spines incidens (Thomson) 



— Eighth segment ventrally with a single median apical 

 toothlike spine maccrackenae Dyar and Knab 



Larvae 



1. Saddle with a conspicuous group of dorsal bristles at 

 apex; submedian mesonotal hair strongly developed, 

 with 3 or more branches and about as long as antenna 

 maccrackenae Dyar and Knab 



— Saddle without dorsal bristles at apex; submedian 

 mesonotal hair (hair 1) weak, single, considerably 

 shorter than antenna 2 



2. Upper head hair similar to lower head hair in length 

 and number of branches impatiens (Walker) 



— Upper head hair shorter than lower and with more 

 branches 3 



3. Lateral hairs of anal segment about as long as or 

 longer than saddle (fig. 14:176); head hair d more 

 strongly developed than head hair e and often with 3 or 

 more branches inornata (Williston) 



— Lateral hair of anal segment considerably shorter than 

 saddle; head hair d about equal in size to hair e and 

 usually double incidens (Thomson) 



Keys to the CaUfornia Species of Culex 

 Fema les 



1. Tarsi with pale bands 2 



— Tarsi unbanded 5 



2. Proboscis completely encircled by a white band near 

 the middle 3 



— Proboscis dark above 4 



3. Outer surfaces of femora and tibiae with white scales 

 arranged in a narrow line or in a row of spots; venter of 

 abdominal segments with an inverted black V; meso- 

 notom typically with a line of white scales around 

 front margin back to angle above spiracle, in supra-alar 

 area, and on either side of prescutellar area; Del Norte 

 to Imperial counties tarsalis Coquillett 1896 



— Outer surfaces of femora and tibiae without white 

 lines or rows of spots, venter of abdominal segments 

 with median black spots; mesonotum without definite 

 white lines; Siskiyou County to San Diego County 



stigmatosoma Dyar 1907 



4. Proboscis with a definite median pale area beneath; 

 tarsal bands distinct and whitish; Shasta to San Diego 

 counties thriambus Dyar 1921 



— Proboscis without a definite median pale area beneath; 

 tarsal bands rather indistinct and with a brownish 

 yellow tint; San Luis Obispo, Orange, and San Diego 

 counties restuans Theobald 1901 



5. Abdominal segments 2 to 4 all dark as seen from above 



6 



— Abdominal segments 2 to 4 with bands or lateral spots 

 as seen from above 7 



6. Vertex with a row of broad appressed scales forming a 

 narrow border back of eyes; San Diego County. . . . 

 anips Dyar 1916 



— Vertex without a row of broad appressed scales behind 

 eyes; Monterey County reevesi Wirth 1948 



7. Pale markings of abdominal tergites apical 8 



— Pale markings of abdominal tergites basal 10 



8. Ventral pale stripe of hind femur ending shortly before 

 apex; palpus about 3 times as long as flagellar segment 



4 as seen in lateral view; Trinity County to San Diego 

 County apicalis Adams 1903 



— Ventral pale stripe of hind femur complete; palpus 

 about 2 times as long as flagellar segment 4 as seen in 

 lateral view 9 



9. Pale scales of vertex ashy white; abdominal segments 



5 of unengorged dried specimens about 1.3 times as 

 broad as long; Humboldt County to Mariposa County 



territans Walker 1856 



— Pale scales of vertex with a yellowish tinge; abdominal 

 segment 5 of unengorged dried specimens 1.5 to 1.7 

 times as broad as long; Trinity to San Diego counties 

 boharti Brookman and Reeves 1950 



10. Mesonotal integument brownish red; bands on abdominal 

 tergites 2 to 5 narrow and with indistinct outlines; 

 Colusa County to Riverside County 



erythrothorax Dyar 1907 



— Mesonotal integument brown or dark brown, not conspic- 

 uously reddish; abdominal tergites 2 to 5 with rather 

 broad and definite bands 11 



11. Bands of abdominal tergites 3 and 4 connected with 

 lateral spots; mesonotal integument usually reddish 

 brown; Colusa County to San Diego County 



pipiens L. 1758 



— Bands of abdominal tergites not connected with lateral 

 spots; mesonotal integument usually dark brown; San 

 Joaquin to Imperial counties .quinquefasciatus Say 1823 



Male Genitalia 



1. Paraproct (10th sternite) crowned with a single row of 

 teeth of which the outer are peglike, blunt 2 



— Paraproct crowned with a clump of many bristles .... 6 



2. Subapical lobe of basistyle deeply divided, bearing 

 several hooked rods and a broad leaf; dististyle tipped 



