1919] Dietz: Streptocera Group of Tipida 91 



inclined inwardly, the inner margin with a large obtuse tooth and 

 several smaller denticles. Ninth sternite very short, with slight 

 medium notch. Pleural process long, somewhat flattened, twisted 

 and appearing like an extended S. Apical appendages small and 

 inconspicuous. 



Female. Length, 12 millimeters; wing, 13.5 millimeters. 



Antennae shorter and more slender. Dorsal stripe of abdomen broader 

 and more diffused posteriorly; the lateral stripes broad, strongly marked, 

 tergites three to seven without lateral spots. Eighth segment entirely 

 fuscous. Ovipositor dark testaceous, the upper valves short, quadrate- 

 oval, dark brown; lower valves paler, very small, scaphoidal. 



Holotype, cf , Sonoma County, California, April 2()th, 1914. 



Allotype, 9 , topotypic. 



Paratypes, 4cf d^'s, 3 9 9 's, topotypic- 



A very distinct species. The ninth tergite of the male, 

 with its deep, oval emargination, the sides thereof prolonged 

 and strongly incurved with a large, obtuse point on its inner 

 margin, distinguish this from the other species. The thoracic 

 stripes are pronounced in all my specimens. 



Tipula mutica spec. n. 



Yellowish testaceous, shining. Antenna! flagellum unicolorous. 

 Thoracic stripes almost effaced. Pleural process twisted, curv^ed, 

 broad in basal portion. 



Male. Length 12 millimeters; wing, 14 millimeters. 



Head. Frontal prolongation and rostrum reddish-brown, with short, 

 black hair. Palpi dark fuscous, joints two to four whitish at the base, the 

 fourth joint scarcely as long as the preceding joints combined. Front 

 and occiput grayish-fuscous, whitish along the upper orbital margin, 

 a dark brown fronto-occipital stripe. Antennae of moderate length, 

 slender; first three joints pale yellow, remaining joints fuscous; basal 

 enlargement of segments blackish with the usual whorl of setae, the 

 latter much shorter than the respective segments; pubescense fine, 

 whitish. 



Thorax concolorous, shining, the stripes faintly indicated, a shade 

 darker than the ground color. Scutel and postnotum finely sericeous. 

 Pleurae pale yellow, faintly sericeous. Legs yellow, femora and tibiae 

 infuscate at the apex; the short, dense, black pilosity gives the legs a 

 darker appearance; tibiae distinctly longer than the metatarsi; tarsi 

 fuscous. Halters pale fuscous, lighter towards the base, club dark 

 fuscous. Wings pale gray, costal cells with a pale, yellow tinge, stigma 

 pale yellowish-brown. Cell 1st M2 about twice as long as wide, veins 

 brown, those beyond the cord broadly margined sub-hyaline, veins 

 M and Cu less distinctly margined. The antestigmal spot is rather 

 faint and does not extend beyond cell 1st M2; a faint hyaline spot beyond 

 the stigma. R s, veins M, Cu, Ai and apical veins setulose. 



