Vol. X] ALEXANDER— UN DESCRIBED TIPULW/E 43 



8. Tipula cahuilla, new species 



General coloration of the head and thorax light gray, the 

 former with a narrow brown median line ; mesonotal prsescu- 

 tum with five narrow brown lines ; scutellum with a capillary 

 brown line ; wings grayish sitbhyaline ; stigma dark brown ; the 

 distal cells of the wings with conspicuous macrotrichiae ; ab- 

 domen dark gray, the tergites with two yellow sublateral 

 stripes ; male hypopygium simple ; abdomen of female very long 

 and slender. 



Male. — Length, 9-12 mm.; wing, 9-11.3 mm. 



Female. — Length, 17.5-18.5 mm.; wing, 11-12 mm.; abdomen alone, 13.5- 

 14.8 mm. 



Frontal prolongation of head dull yellow, light gray above; palpi dark 

 brown. Antennae with the first segment light gray ; remaining segments 

 dark brown ; flagellar segments subcylindrical, weakly incised beneath. 

 Head light gray with a delicate brown dorso-median stripe and a broad, 

 whitish ring around the eyes. 



Pronotum gray. Mesonotal prsescutum gray, the interspaces betv/een the 

 usual stripes dark brown; there thus appear five narrow brown lines of 

 which the lateral pair represent the margins of the gray lateral stripes ; 

 the median vitta narrower, dark brown, not attaining the suture ; scutum 

 gray, each lobe with a brown circular mark; scutellum brownish testa- 

 ceous medially, gray laterally, with a capillary brown median line ; post- 

 notum light gray. Pleura light gray, indistinctly variegated with pale 

 spots on the mesepimeron and across the dorsal margin of the sterna. 

 Halteres brown, the knobs darker, the bas^of the stem pale. Legs with 

 COX32 light gray ; trochanters dark brown ; femora brownish yellow, the 

 tips dark brown ; tibiae brownish yellow, soon passing into brown ; tarsi 

 dark brown. Wings grayish subhyaline, cell Sc a little yellowish ; stigma 

 conspicuous, dark brown ; veins dark brown ; numerous macrotrichiae in 

 the apices of cells R3, R-,, Mi, 2nd Ah and Mi. Venation : Rs gently arcu- 

 ated ; cell 1st A'h small, pentagonal ; petiole of cell Mi a little longer than 

 m; m-cu punctiform, located at about one-fourth the length of cell 1st M2. 



Abdominal tergites dark gray with two conspicuous sublateral yellowish 

 stripes, the caudal and lateral margins of the segments broadly pale; 

 sternites dark gray, the caudal margins of the segments conspicuously pale. 

 Male hypopygium of very simple structure. Ninth tergite broader than 

 long, the caudal margin with a broad V-shaped notch, the lateral angles 

 obtusely rounded ; tergite not fused with the other sclerites of the hypopy- 

 gium. Ninth sterno-pleurite extensive, the two pleural appendages very 

 simple in structure, the outer one an oval, fleshy lobe that is covered with 

 very short pile ; inner appendage still smaller, bifid at the base, the outer 

 branch small, black, the inner branch produced into a cylindrical beak. 

 Ninth sternite with a profound, narrow, median notch. Eighth sternite 

 unarmed. In the female, the abdomen is unusually long and slender, as 

 will be seen by the accompanying measurements ; the yellow abdominal 

 stripes are very conspicuous. Ovipositor with a conspicuous dorsal shield ; 

 tergal valves broad basally, lying transversely, the outer margins entire; 

 sternal valves much shorter, the tips truncated. 



