00 A REVISION OF THE NEARCTIC SCIOMYZIDAE 



named. It is rather full, but the species is considered typical 

 of the genus and group, and other forms will be referred to it 

 with the differential characters alone mentioned. 



cT. Cinnamon to honey-yellow; hind femora without brown apices; apices 

 of tar-si generally dark. Wings and veins pale; stigma, costal border to and 

 including apex, fourth vein, and both cross-veins, fuscous. Arista except 

 extreme base, all bristles and setulae, black. Occiput above foramen wath 

 or without black spot between two silvery ones. Face with or without 

 brown or black antennal orbital spots. 



Opaque; the more or less depressed, darkened, median, and relived orbital 

 stripes of frons, and lunule, polished. Mesonotum more or less shining 

 laterally and faintly bivittate medially. Face and cheeks silvery to yellowish- 

 white, sericeous. Thorax, scutellum, and abdomen, ochraceous pruinose; 

 segments of latter sometimes dark; pleura with a complete brown stripe 

 above. 



Frons subhorizontal, slightly jiroduced at antennae; orbital stripes ab- 

 breviated; median one complete, but sometimes not quite attaining margin; 

 lunule more or less visible; two reclinate frontal bristles, rather approximate. 

 Face flat or slightly concaved, retreating. First antennal joint visible; 

 second, trapezoidal to rectangular; third, about twice as long as second, roundly 

 or sharply pointed; arista moderately plumose, more dense basally. Scutel- 

 lum flattened or slightly convex. Fifth abdominal segment as long as fourth; 

 sixth subconical; fifth and especially sixth with long marginal bristles; fifth 

 ventral distinctly visible next to the genital segment. Fore femora with 

 series of about six strong bristles above and a few weak ones below; middle 

 femora with one or two anterior bristles; hind femora with a few upper bristles 

 and two series of flexors; between the latter the surface is densely setulose; no 

 posterior bristle on middle femora. Wings with second to fourth veins 

 parallel; small cross-vein at middle of discal cell; hind cross- vein bowed out- 

 wards or straight, but slightly oblique; fourth vein sometimes with appendage 

 in discal cell. Length. — 6 to 8 mm. 



9 . Similar with usual sexual differences. 



The species was originally described from Europe, this being 

 the first American record for the name. Our material has been 

 standing under the name pleheia Loew, which is here considered 

 a varietal form. There are several of these varieties or forms of 

 ekita wiiich may be roughly separated as follows: 

 Costa, including stigma distinctly infuscated. 



Arista den.sely plumose plebeia 



Arista s|)aringly jilumose elata 



Costa entirely clear or hyaline triangularis 



Costa infuscated apically only rotundicornis 



The nic(li;iii polished frontal stripe varies from short and sub- 

 Iriaiigular {tridnnuldris) to completely and broadly attaining the 

 margin. The secontl antennal joint varies from trapezoidal 



