1909] Rohherflies of the Genus Asilus • 145 



Asilus gracilis Wiedemann. (Figs. 1 and 2.) 



A long slender species with A^ellow body and legs, facial gibbosity 

 very small, mystax composed of a few white bristles. Length 15-17 

 millimeters. 



Head rather large, face and front narrower than usual; palpi and 

 proboscis dark, the former clothed with light hair ; first two segments 

 of the antenna yellow, third brown, first segment longer than the 

 second, arista near twice as long as its segment ; occipito-orbital bristles 

 largely yellow, although in some specimens these are nearly all black. 

 Facial gibbosity hardly evident, mystax composed of a dozen or so 

 light colored hairs and bristles. Thorax yellow, thinly clothed with 

 gray dust, mid-dorsal stripe dark brown ; wings hyaline with a slight 

 clouding at the apex and along the posterior border; legs pale, anterior 

 side of each femur, apex of each tibia and of each tarsal segment 

 usually darker, although there is quite an amount of variation in the 

 color of the legs. Abdomen somewhat darker than the rest of the 

 body, nearly uniformly colored but with narrow band on the posterior 

 border of each segment a little lighter; these narrow bands are each 

 preceded by about four yellow bristles on either side of the abdomen. 

 Male upper forceps short, rounded at the tip, of nearly the same 

 width throughout; lower forceps dropped so that there is always a 

 distinct space between the upper and lower; end lamella of the oviduct 

 style-like. 



Specimens from North Carolina, Texas, Florida, and Georgia. 

 The type of Asilus auratus has been studied and is this species with- 

 out question. The long antennal arista makes the species easy of 

 identification. 



Asilus lecythus Walker (Figs. 3 and 4). 



Asilus femoralis Macquart is this same species but as there is an 

 older Asilus femoralis by Zeller from Europe, Isis 1840, 49, 3, Walker's 

 name must be used. 



Color yellowish brown; femora largely black but each with pre- 

 apical band and often with the posterior side yellow, tibiae and tarsi 

 in large part yellow. Length 18-21 millimeters. 



Face and front covered with pale yellowish dust; facial gibbosity 

 prominent, mystax composed of a few black hairs above and numerous 

 pale yellowish hairs below, beard pale, palpi and proboscis black, 

 the former with light colored hairs; antennae largely black but apex 

 of second and base of third joints plainly yellow; first two segments 

 together equal in length to the third which is of nearly the same length 

 as its arista. Occipito-orbital bristles black and yellowish, somewhat 

 variable ; other bristles and hairs of the occiput light colored. Thorax 

 dull gray on the sides, more yellowish above, mid-dorsal brown stripe 

 divided anteriorly ; wings largely hyaline, apical portion and posterior 

 border slightly clouded; coxae colored like the sides of the thorax, 

 femora variable, in some specimens black with the exception of the 

 preapical band; in others, the whole posterior side yellow, even the 

 different femora of the same specimen may vary in coloration ; tibiae 



