THE CANADIAN ENTOMOLOGIST. 53 



Tipula arizonica, sp. n. 



Male — Length 9.8-10 mm.; wing 11.3 mm. 

 Female — Length 14.5 mm.; wing 14 mm. 



Palpi pale yellow with black hairs, the third segment with a 

 sparse pale gray bloom, the terminal segment dark brown. Frontal 

 prolongation of the head elongate, shiny yellowish, the extreme 

 base light gray ; nasus prominent. Antennae indistinctly bicolorous, 

 the basal segments light yellow; the third segment yellow, passing 

 into brown on the apical half; remainder of the flagellum dark 

 brown, the basal enlargement a little more intense, the segments 

 slightly incised. Head light gray with a subimpressed, very in- 

 distinct median brown line; a row of large hairs following the inner 

 m^argin of the eye. 



Thoracic dorsum opaque light yellow, without distinct stripes, 

 although they may be faintly indicated beneath the bloom. Pleura 

 yellow, with a sparse whitish bloom. Halteres rather short, but 

 slender, brown, the knob a little darkened. Legs with the coxae 

 yellow, very sparsely white pollinose; trochanters yellow; femora 

 light yellow, soon passing into brown; tibiae brownish yellow; 

 tarsi brown. Wings hyaline or nearly so, the costal cells yellowish, 

 the stigma a little brownish, veins brown. 



Abdominal tergites yellow, the segments three to six more 

 brownish, the segments broadly ringed with silvery; a rounded 

 brown spot on the sides of segment two beyond mid -length of the 

 sclerite; rounded brown spots on the sides of segments three to 

 five at the base; hypopygium brownish; sternites yellow, the 

 sclerites somewhat indistinctly ringed with silvery. Ninth tergite 

 large, the lateral angles produced slightly and bent strongly ventrad ; 

 eighth sternite very large, prominent, the apex with a dense brush 

 of yellow hairs. 



The female is like the male, but the antennae are shorter and 

 more distinctly bicolorous; the spots on the sides of the abdomen 

 rather distinct; tergal valves of the ovipositor very long, the tip 

 rounded, the sternal valves very short, the apex abruptly truncated. 



Holotype, d" , Williams, Arizona; May 30 (H. S. Barber). 



Allotype, 9 , topotypic; May 29. 



The type is in the collection of the United States National 

 Museum, the allotype in the collection of the author. 



