52 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



Scutclluiu with four bristles. Fourth and fifth abdominal seg- 

 ments without distinct marginal bristles. Femora normal, slen- 

 der; median and hind femora without distinct bristles; one pre- 

 apical on tibiae. Third and fourth veins parallel. 



In most respects our species closely simulate Chaetomacera 

 vnicolor and allies, but may be distinguished by the absence of 

 the femoial and alxloniiiiai l)ristles. 



Key to the Species 



Two frontal bristles; niesonotiiin opiujue; arista short plumose johnsoni 



But one frontal bristle; mesonotum somewhat shining. 



Arista densely plumose longipes 



Arista loosely i)lumose amanda 



Renocera longipes Loew 



1876. Sciomyza longipes Loew, Zeit. Ges. Naturw., Berlin, xlviii, 328. 



Loew's specimen of this species was lacking the third antennal 

 joint, which fact was noted by Hcndel in his remarks regarding 

 the possibility of synonymy with Sciomyza paUida Fallen."^ This 

 synonymy may be possible, but there are some disagreements 

 with the tlescriptions in several places, so that it is not advisable 

 to chance confusion in the identification. That the specimen 

 befoi-e me may not be S. longipes, is also possible, but I do not 

 doubt the correctness of this determination. 



9 , cf . Entirely tawny to buff, except the black arista and blackish apical 

 joints of fore tarsi. Wings yellow with dark veins; costa beyond first vein, 

 and both cross-veins, broadly infuscated. Frons opaque, wax-yellow, with 

 broad anterior margin, narrow median stripe, and vertical orbits, polished. 

 Face silvery, with upper part tawny. Cheeks silvery. Antennae entirely 

 tawny; third joint not infuscated apically. Mesonotum shining, faintly, 

 narrowly vittatc. Lower part of pleura opaque, silvery. Scutellum con- 

 colorous with mesonotum. Apices of abdominal segments narrowly whitish. 

 Fore coxae whitish, silvery. 



Frons slightlv broader than long, with one frontal. Face slightly con- 

 caved, retreating. Cheeks equal to one-third of eye-height. Antennae with 

 third jfjint three times as long as second, twice as long as broad, tapering to a 

 round(!d apex, and slightly concaved above; arista very densely plumose 

 to tip. Mesonotum with one dor.so-central, no prescutellar, but distinct 

 presutural. Pkuira, except sterno])leura, bare. Scutellum flat with four 

 bristles. Wings similar to Chaetomacera elata, but the hind cross-vein is 

 straight, and stigma not infuscated. Length. — 6 mm. 



•Hendel, 1902, p. 7(). 



