NEW MALl.Ul'lIAGA. lo7 



Flycatclier, Empidoncw diffi.cilis; Ash-throated Fly- 

 catcher, Myiarchus cinerascens; Spurred Towhee, Pip'ilo 

 macitlatus laeyalonijx; California Towhee, Fipilo fuscus 

 crissalis: Cedar Waxwiiig, Ampelis cedrorum; Samuel's 

 Song Sparrow, Melospiza fasciata saniuelis; Least Vireo, 

 Vireo bellii pusillus. In addition, we distinguish the 

 three following species of the genus. 



Physostoraum sucinaceum Kellogg. 



New Mallophaga, 11, ISDG, p. 514. pi. Ixx, fig. 2. 



Three specimens from a Western Flycatcher, Empi- 

 donax dij^cilis (Palo Alto, California). Previously 

 taken by Kellogg from the same host (same locality). 



Physostomum diffusum Kellogg. 



New Mallophaga. II, 1896, p. 518, pi. Ixx, Hg. 3. 



One specimen, var. pallidum Kellogg from an Oregon 

 Junco, Junco hyemalis oregonus (Pullman, Washington). 

 Taken previously by Kellogg from Junco sp. (Law- 

 rence, Kansas). 



Physostomum promiiiens ii. r-ji. (Plate IX, fig. 5). 



Two si)ecimens from a Costa's Hummingbird, Cali/pte 

 costa' (Ontario, California). This strange form with its 

 lateral head margins deeply sinuate and its unique pro- 

 thorax is very different from any other Phifsostomum 

 described. The specimens are probably not fully 

 mature, one distinctly immature, the other lacking 

 probablv onlv coloration intensitv. 



Descrijition. Body, length 2 mm., width .85 mm.; 

 transparent whitish; head short and broad, with deeply 

 sinuous lateral margins; eyes in the posterior angles. 



Head, length .5 mm., width .53 mm.; broad, short; 

 front broad, straight; conspicuous projecting lateral 



