356 DIPTEROUS GENUS TIPULA 



inner conical part and an outer subquadrate plate, the former fringed 

 with hair along its free margin; the lower process incised on its posterior 

 'margin, the upper part somewhat enlarged outwardly and fringed with 

 short hairs. Lateral appendages with two strongly chitinized processes; 

 the upper of these is long, slender and expands into a blackish knob; the 

 lower process strong, clawlike, apical half black. Legs slender, sordid 

 yellow, anterior coxae with fuscous dot at base anteriorly ; apices of fem- 

 ora, tibiae and tarsi, fuscous. 



Wings rather wide, pale grayish fuscous; stigma fuscous, spot over prae- 

 furca pale fuscous; costal and subcostal cells pale yellow; a whitish ill- 

 defined area before the stigma, a more conspicuous one behind the stigma, 

 extends across basal half of second submarginal and first posterior cells 

 and discal cell, becoming less distinct and evanescent along the vein sepa- 

 rating the fourth and fifth posterior cells; two indistinct spaces and mar- 

 gins of second basal cell paler; two pale spots in anal cell connected by a 

 subfuscous streak. 



Holotype: cf; Denver, Colorado. July 16, 1912. (Ernest 

 Oslar.) 



Paratypes: cfcr^; Bear Creek, Colorado. August 14, 1912; 

 Chimney Gulch, Golden, Colorado. June 22, 1912. (Ernest 

 Oslar.) Four specimens in my collection. 



The nearest ally of this species is T. grata, from which it is at 

 once distinguished by its general darker appearance, the first 

 posterior cell vv^hite in basal part only, the antennal flagellum 

 darker brown and essentially by the upper process of the lateral 

 appendage being slender and conspicuously enlarged at the apex. 



Tipula clathrata spec. n. (Plate XIII, figs. 12 and 13; plate XIV, fig. 5.) 



Color j^ellowish brown; median stripe of mesonotum concolorous with 

 interrupted fuscous margins. Wing patterns strongly marked. Lateral 

 appendage with three processes, the median process consists of two laminae. 



c?, Length, 13.5 mm.; wing, 16.5 mm. 



Anterior leg: femur, 9 mm.; tibia, 11 mm.; tarsus, 14.5 mm. 



Head yellowish cinerous; occiput with median fuscous line and short 

 blackish hairs each side behind the eyes. Rostrum sordid yellow with a 

 fuscous line each side; nasus infuscate, beset with blackish hairs. Front 

 and face pale yellowish. Palpi fuscous, beset with scattered hairs, last 

 joint sordid yellow; joints 3 and 4 equal, the fourth joint fully as long as 

 the three preceding joints together. Antennae very slender, bent back 

 they reach to about the middle of the metanotum; scape pale yellow; fla- 

 gellum light brown, finely pubescent, segments a trifle paler at base, very 

 little thickened at base and beyond the middle and each with four or five 

 basal setae. 



