166 Annals Entomological Society of America [Vol. IV, 



reddish in part ; tibiae reddish with the extreme apices darker ; all of the 

 tarsi brown or black. Abdomen largely gray pollinose and clothed with 

 pale hairs; dorsally the first six segments each have a rectangular black 

 marking which occupies about the anterior half of its respective seg- 

 ment. Male genitalia black, clothed with pale hair, female genitalia 

 shining black. 



Specimens from Kansas, Wisconsin, Illinois and Ohio. 



Promachus rufipes Fabricius. 



Total length 28 to 35 millimeters. This is a larger species than 

 vertebratus. The color of the thorax is much browner than in that 

 species and the color of the wings is more pronounced. The palpi are 

 black with black hair and the hypopygium is shining black with scat- 

 tering black hairs. The legs are somewhat variable, or at least in the 

 specimens before me they show two distinct types of coloration. The 

 specimens that agree closer to the original description have pure black 

 femora and reddish yellow tibiae with black apices. In another set of 

 specimens the femora and tibiae, except the apices, are reddish brown 

 throughout and do not show any contrast. In other respects the two 

 series of specimens exactly agree and I prefer to consider them all 

 rufipes. 



Specimens at hand from District of Columbia, Tennessee, 

 Mississippi, Iowa and Ohio. 



Promachus sackeni n. sp. 



I take this to be Promachus No. 2, Biolog. Cent. Am., 

 Volume I, page 193. 



Total length 22 to 27 millimeters. Mystax composed of black and 

 yellow bristles intermixed, palpi black, mostly with black hairs but 

 there may be light colored ones intermixed, especially on the basal 

 parts, beard white, thorax gray pollinose above with the usual mark- 

 ings, wings uniformly pale brownish, the dark marking in the first 

 submarginal cell very little more than one-fourth as wide as the cell at 

 the widest part, femora, apex of the tibiae and the tarsi black with 

 black bristles, remainder of the tibiae yellowish red with numerous 

 pale hairs and a few black bristles, claws pointed and distinctly curved. 

 Abdomen with much yellowish hair which on the sides is rather long; 

 segments two to seven in the male and two to five in the female with 

 gray pollinose triangles on the sides, the inner angles on each side- 

 meeting above on each of segments two to five in both sexes and forming 

 a posterior gray band; the hypotenuse of each triangle is slightly con- 

 cave, leaving on each segment a semicircular spot which is clear black; 

 hypopygium black, slightly wider than the abdomen, evenly rounded 

 posteriorly, with mostly black hairs dorsally and pale yellow hairs 

 laterally; ovipositor black, somewhat longer than abdominal segments 

 four and five. 



