ADAMS : DIPTEROLOGICAL CONTRIBUTIONS. 29 



scribed. E. nigra Bigot, from California, is too poorly described 

 to have a place among the known species ; the description is 

 fairly complete as far as it goes, but is silent concerning the 

 legs, and says very little about the wings. A few of the species 

 I have not seen and had to rely upon the descriptions. 



Euparyphus mutabilis, n. sp. 



Male : Head black, frontal triangle yellow, face shining black 

 with lateral subtriangular whitish pruinose spots, in some 

 specimens with two narrow yellow lines extending downward 

 from base of antennae ; inferior occipital orbits whitish prui- 

 nose, facial orbits, cheeks and occiput with whitish pile, mouth- 

 parts yellow, antennoe wholly brownish black, eyes sparsely 

 pubescent; thorax black, pile on dorsum pale yellow, on sides 

 almost white, two yellow stripes on each side of middle, which 

 in some specimens meet the broader lateral stripes in front, 

 each of the lateral stripes contains a black spot above base of 

 wing ; a narrow yellow fascia on upper part of pleura between 

 humerus and base of wing, a small spot at lower end of meso- 

 pleural suture, a larger one on metapleurse yellow ; scutellum 

 yellow, sides at base and tips of spine black, halteres yellow; 

 abdomen black with yellow margin, which sends broad projec- 

 tions inward on each segment, venter black with narrow yellow 

 bands on posterior borders of segments, the one on the second 

 segment usually short but broad ; cox?e black, femora black ex- 

 cept apices, tibiae slightly reddish yellow except a narrow brown 

 band near the middle, the tarsi wholly brown, the base of mid- 

 dle and posterior metatarsi testaceous ; wings hyaline, stigma 

 and larger veins yellowish, third vein forked. 



Female : Front yellow, with a median black line extending 

 from ocellar tubercle to just above base of antennae where it is 

 produced laterad, frontal orbits on upper half black, which 

 color extends from the superior angle of eye diagonally to near 

 middle of vertex, also narrowly along superior occipital orbits, 

 remaining occipital orbits broadly yellow ; the two yellow line 

 of face broader than in the male and slightly divergent below, 

 eyes bare, yellow on sides of thorax more prominent, lateral 

 yellow margin of abdomen more regular in outline, the legs less 

 dark, all metatarsi and base of second tarsal joint yellow-; other- 

 wise same as male. Length, 6 mm. 



