OF THE TABANID^ OF THE UNITED STATES. 397 



Female. Yellow ; thoracic doi'sum grayish, tip of the abdomen brown ; tip of antennae, 

 front tibiae and tarsi black ; wings brown at the apex and with a brown stigma. Length, 

 9-10 mm. 



Palpi and antennae ferruginous-yellowish ; the end of the third joint of the latter black- 

 ish or brown ; face grayish ; fi'ont comparatively narrow, yellowish above the antennae, 

 grayish above the callosity and yellowish-gray toward the vertex ; callosity nearly square, 

 blackish or black. Thorax yelloAvish ; the middle portion of the dorsum is grayish, which 

 color is tempered by a yellowish pollen ; pleurae and pectus, in part, gray. Abdomen ferru- 

 ginous-yellowish, clothed with a golden-yellow pubescence ; sixth segment brown on the 

 sides ; seventh entirely brown ; (in some specimens the preceding segments also show a 

 brownish tinge on the sides). Distal third of the front femora, the front tibiae and tarsi 

 black ; distal half of tlie middle tarsi brownish ; hind tarsi, except the base, and hind tibiae, 

 more or less brown ( the hind tibifB seem to vary in the intensity of the coloruig ; in one 

 specimen they arc brown, except at the base ; in another the brownish coloring is hardly 

 perceptible at all ; the third holds the middle between the two) ; the remaining portion of 

 the legs is yellow. Wings subhyaline ; stigma brown ; the apex, immediately beyond the 

 tip of the second vein, is brown ; this tinge becomes much fainter, however, toward the 

 hind margin ; a faint l:)rown tinge in the jiroximal half of the first posterior cell encroaches 

 more or less on the first basal cell and extends along the centi'al crossveins ; costal cell 

 yellowish. 



I have four female specimens before me ; two from Florida and two from Mexico. One 

 of the latter has the hind tibia3 brown except at the base. 



This species occurs also in the Carolinas (Macquart), in the West Indies and Honduras 

 {Ohrysops conceryeus Walker), and in Brazil (Macquart). 



The synonymy embraces not less than six specific names ; Mr. Walker, in his List of the 

 Diptera of the British Museum, after having identified it once as Dichelacera ferrugata, 

 describes it twice as a new species, and quotes it a fourth time as Diabasis atcunia. The 

 descriptions of Chrt/sops cojivergens Walker, and cqjproximans Walker, which are beside 

 each other, ai'e absolutely identical ; a slight difference appears in the hind legs, the coloring 

 of which, as I h;ive shown, is variable. The other synonymies will not seem in the least 

 (lou))tfal to any one who will take the trouble to compare them. 



MBMOIIIS no9T. .sec. XAT. IIL3T. VOL. H. 100 



