62 S. W. WILLISTON. M. D. 



of the anterior segments). Ovipositor and hypopygium black, the latter small 

 and thinly black pilose. Legs black, with black and whitish pile, and black 

 bristles; all the tibiae light red except the tip. Wings very distinctly tinged with 

 yellowish. 



Hah. — Ga., Fla. Six specimens. 



A specinen from Illinois I refer, doubtfully, to this, from the darker 

 color of the thorax ; it ha.s, however, the femora red above. 



Proniachus vertebratus. 



Asilus vtrtebratus^&y, S. A.c!id. Phil, iii, 47; Compl. \Vr. ii, fi2; Wiedemann, 



Atiss. Zw. Ins. i, 4S5, 91. 

 Trupanea vertebrata Macquart, Dipt. Exot. i, 2, 103, 27. 

 Promachus vertebratus Schiner, Verh. Z. B. Ges. xvi, 688. 



% . — Length 25 mm. Seven specimens from Kansas I refer to this 

 species; they resemble P. rujipes very much, though probably different. 

 The third joint of the antennje is more broadly oval and shorter, as is 

 the whole antenna ; the third joint is, moreover, yellowish at the base. 

 The front is comparatively broader, and the thorax is more grayish, not 

 reddish brown. The color of the pollen throughout is less yellowish. 



In one of these specimens the tip of the tibicC is not black, and the 

 tarsi are yellowish. The differences between this and rvjipes are not the 

 most satisfactory, but the deeper brown color in riijipes renders this easily 

 distinguishable to the eye. 



Promachu^i princcps n. sp. 



Promachus n. sp. Williston, Trans. Amer. Ent. Soc. xi, pi. ii, fig. 15. 



% , 9 • — Length 25-27 mm. Face covered with white pollen and white hair, 

 the bristles rather thin and abundant on the middle, above them the hair is rather 

 abundant, below the antennje ; along the oral margin on each side there are about 

 four rather weak black bristles; the ground-color of the face on each side is in 

 part red. Antennae black, the first joint with white, the second with black hair, 

 third joint broadly ovate, but little less than half as wide as long. Front thickly 

 gray pollinose, with white hair, except some short black bristles on the sides and 

 ocelli. Occipito-orbital bristles black; beard silky white, as is also the hair on the 

 proboscis below, the palpi with more or less black bristly hairs. Dorsum of thorax 

 thickly grayish pollinose, with two brownish median stripes, separated by a linear 

 interval, and on each side with larger, less distinct brownish spots; clothed with 

 short sparse black hair, behind and on the scutellum with long white pile, bristles 

 black; pleurse thickly pollinose and with sparse white pile; the ground-color of 

 the humeri, less distinctly on the post-alar callosities, and portions of the coxae, is 

 yellowish red, the thorax elsewhere is black. Abdomen black, but little shining, 

 with very short black hair, the sides of all the segments broadly gray pollinose, 

 extending across on the posterior part of the segments, and with longer, but sparse 

 white hair; seen from in front the abdomen shows a black, somewhat shining spot 

 on each segment, very large on the front segments, so tJiat there is only a narrow 

 gray border behind, becoming successively smaller, so that on the last segment it 



