J. R. MALLOCH 275 



others in Limn phora, \n\{ the exact status of the latter is un- 

 certain, the genotj^pe being an unrecognized European species. 

 Several generic names have been used by authors for sections of 

 Lmmophora, but careful work will be necessary to establish the 

 validity of any of these. The absence or presence of the prealar 

 bristle is quite unreliable as a distinguishing character for this 

 and allied genera. 



Localities: twelve specimens, Berkeley Hills, Alameda County, 

 Cahfornia, April 11 and 20, 1908; six specimens, Yosemite Valley, 

 Cahfornia, May 22, 1908; one specimen, HighroUs, New Mexico, 

 May 31, 1902. 



Limnophora discreta Stein 



1897. Li»in()/>li<rra discreta Stein. Berl. Ent. Zcit., xlii, 204. 



This species can be distinguished from the preceding one by 

 the much less distinct forward curvature of the fourth vein. 



One female in poor condition, Redwood Canon, California, 

 May 17, 1908. 



Limnophora aequifrons Stein 



1S97. Li/unuphurd nequifrons Stein, Berl. Ent. Zeit., xlii, 205. 



The female of this species is distinguished from any so far 

 described from North America by the very narrow frons, which at 

 vertex is much less than one-third the head-width. 



Four females: Berkeley Hills, z\lameda County, California, 

 April 20, 1908; Redwood Canon, Marin County, California, May 

 17, 1908; Alamogordo, New Mexico, May 8, 1902; and Troy, 

 Idaho, May 31, 1908. 



Limnophora surda Zetterstedt 



1S45. Aricid surda Zetterstedt, Dipt. Scand., iv, 1476. 



Four females are in collection with data as follows: two speci- 

 mens. Redwood Canon, Marin County, Cahfornia, Maj' 17, 

 1908; one specimen, Beulah, New Mexico, top of Las Vegas 

 range, June 28, 1902; one specimen, Moscow, Idaho, June 2, 

 1908. 



TRICHOPTICUS Kondani 



There is only one specimen of this genus in the collection, a 

 female, which differs so strikingly from any other known to me 

 from this country that I have no hesitation in describing it as 

 new. 



TRANS. AM. ENT. SOC. XLIV. 



