The Ohio Naturalist. 
[Vol. XI, No. 6, 
Male 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, from lateral 
view, it appears nearly evenly rounded. 
Three male specimens from Albuquerque, New Mexico, 
collected by J. R. Watson. 
Erax argyrosoma n. sp. Body nearly uniformly 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 vellowish-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 25 millimeters, of the females 22 to 20 millimeters. 
Front yellowish -gray pollenose, antennae black, first two seg- 
ments clothed with gray 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 different 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 mostly with white 
hair, enlarged at apical half until it is nearly twice as wide as the 
seventh abdominal segment. 
