310 The Ohio Naturalist. [Vol. XI, No. 6, 



Alale abdomen silver white, first four segments with long white 

 hair, two, three and four with the hair parted at the middle and 

 directed outward, five, six and seven without long hair, hypo- 

 pygium small, black, narrowed toward apex where, froin lateral 

 view, it appears nearly evenly rounded. 



Three male specimens from Albuquerque, New Mexico, 

 collected by J. R. AVatson. 



Erax argyrosoma n. sp. Body nearh- unifonnly white all over, 

 middorsal stripe of the thorax not plainly marked. Length, 

 23 to 25 millimeters. 



Mystax and beard white, palpi black with white hair, some of 

 the occipito-orbital bristles black and some white; legs black 

 except the basal parts of the tibiae which are yellowish-red, wings 

 hyaline; anterior part of the dorsum of the thorax with short 

 black hair, posterior part and the scutellum with black and white 

 bristles and hairs. 



First four abdominal segments of the male with long white 

 hair, on two, three and four; this is parted at the middle and 

 directed outward, segments five, six and seven, silver white but 

 without long hair, hypopygium black with short white hair, some 

 what notched at the apex with the lower part extended into a 

 prominence. 



Female abdomen gray pollinose, ovipositor shining black, four 

 millimeters in length. 



Taken by J. R. Watson near Albuquerque, New Mexico. 



Erax inflatus n. sp. A dark colored species with the mystax 

 composed of black and gray hairs intermixed, wings hyaline, 

 slightly fumose at apices, legs black with the exception of the 

 extreme bases of the tibiae which are yellowish-red. Length of the 

 males 20 to 2.5 millimeters, of the females 22 to 26 millimeters. 



Front 3^ellowish-gray pollenose, antennae black, first two seg- 

 ments clothed with gra}' hair, occipito-orbital bristles and ocellar 

 bristles black, mystax composed of black and gray hairs inter- 

 mixed, beard silky white, palpi black with black hairs; thorax 

 brownish-gray pollinose with a dark middorsal stripe abbreviated 

 posteriorly, clothed with gray and black hairs and bristles existing 

 in different proportions in difterent specimens; legs black, except 

 the extreme apices of the tibia which are yellowish-red, furnished 

 with white hairs and black bristles and some golden pile on the 

 under side of some of the segments; wings hyaline, slightly dark- 

 ened at the apex. 



Male abdomen with the apex of the second segment and all of 

 the segments from three to seven inclusive silver white, segments 

 two and three with long white hair parted at the middle and 

 directed outward, four and five shows this arrangement somewhat 

 but the hairs are short; hypopygium clothed inostly with white 

 hair, enlarged at apical half until it is nearly twice as wide as the 

 seventh abdominal seginent. 



