1915.] NATUEAL SCIENCES OF PHILADELPHIA. 499 



portion of which is produced cephalad into a chitinized point which 

 is deeply split by a notch; the upper point or lobule is a slender, 

 chitinized, finger-like process, the lower lobule a rounded, chitinized 

 ball; the posterior portion of this flattened lobe is produced into a 

 chitinized point which is cUrected caudad and inward; the posterior 

 margin and face of the appendage is densely provided with long 

 coarse hair. Ninth sternite very extensive, almost continuous, 

 but more membranaceous on the median line beneath; the caudal 

 margin with a concave notch; on the sides of the notch, just ventrad 

 of the pleurite, is a rounded knob which is densely provided with 

 very long pale hair. Eighth sternite long, prominent, narrowed 

 toward the apex whose caudal margin is gently concave and provided 

 on either side of the median line with a tuft of long reddish hairs; 

 ventral surface of the sclerite on the caudal half and along the margin 

 with numerous stout, subappressed black hairs. 



The female is similar to the male; the antennse are shorter; 

 ovipositor with the valves smooth, the tergal valves long, rather 

 slender, rounded at the apex. 



Habitat. — Northwestern United States. 



Holotype, cf, Beaver Creek, Montana; altitude 6,300 feet; 

 August, 1913 (S. J. Hunter). 



Allotype, 9 , topotypic. 



Paratypes, 5 cf 's, topotypic. 



The types are in the collection of the University of Kansas, para- 

 types in the collection of the author. 

 Tipula mandan sp. n. 



Coloration broAvnish gray; antennse rather elongated, the three 

 basal segments yelloA\ish, the flagellum black; head gray with a 

 delicate median brown vitta; thorax grayish with brown stripes; 

 wings grayish hyaline with a brown stigma; abdomen yellowish 

 with three dark brown stripes, of which the lateral pair are interrupted; 

 male genitalia with the ninth tergite small, the caudal margin with 

 a deep V-shaped notch; ninth pleurite produced caudad as a long 

 spatulate point. 



Male. — Length, 10.3-10.5 mm.; wing, 9.5-10 mm. 



Female. — Length, 10.5 mm.; wing, 9-9.2 mm. 



Frontal prolongation of the head dull yellowish, the nasus distinct; 

 palpi with the two basal segments dull brownish yellow, the terminal 

 segments brown. Antennse mth the two basal segments yellowish, 

 the third segment brownish yellow; the remaining segments dark 

 brownish black, the segments elongated, slightly enlarged basally 



