Length to tip of wings: ♂ 12 mm. ♀ 14 mm.; expanse ♂ 21 mm., ♀ 25 mm.

Head (exclusive of eyes ) somewhat wider than prothorax, yellow with obscure light brown markings; lateral tubercles small, pale; ocelli ringed with black, the black sometimes extending a short distance forward and/or toward the eyes. Antennae yellow at base, brown toward the tips, palpi brownish.

Proboscis fully developed. First segment of palpus with a fringe of scales; second segment long, upturned and smoothly scaled. Front rough, with a flattened or somewhat truncated prominence. Genae quadrate ventrally. Male antennae ciliated, scaled above. Fore tibiae with or without claws ; mid and hind tibiae with some fringing scales; mid tibiae of male swollen and enclosing a tuft of long sex scales. Metathorax with slight, depressed tuft. Abdomen smoothly scaled. Venation : fore wing with veins 3, 4 and 5 close together at lower angle of cell, 6 from upper angle, 7 connate from end of areole with 8+9 which are long-stalked (three-fifths distance from areole to margin), 10 from areole, 11 from cell; hind wing with veins 3 and 4 usually connate, 5 arising near 4 and rapidly diverging, 6 and 7 connate from upper angle, 8 touching cell at point only.

The subfamily Geosarginae forms a troulesome complex in the New World tropics, and much work will be necessary before certain generic and specific relationships can he determined. In the Nearctic region, however, conditions are not so serious; for, in spite of the fact that certain of the genera are not very satisfactorily defined, the species are comparatively few and, for the most part, quite distinct. It is hoped that the present review will serve to identify the species found in America north of Mexico.

Numerous species of bees, commonly referred to Panurginus, must, as has been shown by Crawford, be referred to Pseudopanurgus. This is brought out, not only by venation, but also by characters of the genitalia and sternites. It is possible that these insects are to be separated subgenerically from the coarsely punctate, typical, Pseudopanurgus, but their relationship is not with Panurginus. The South American species which I have seen are also Pseudopanurgus.