64 WM. H. ASHMEAD. 



21. Stigma more or less developed, at least twice as long as wide. 



Abdomen smooth, polished, or microscopically reticulated, with hair bands, 

 the venter with a long, sparse pubescence ; hind legs in 9 with rather 

 long, sparse, black scopa, but conspicuously plunose; tongue much 

 elongate, extending to apex of the first abdominal segment; maxillary 

 palpi with joints 1-2 of an equal length; first joint of labial palpi 

 scarcely half the length of the second ciliated; basal joint of hind 

 tarsi in % long, slightly curved, but not produced into a process 

 beyond the insertion of the second joint Eiiteclniia Patton. 



Abdomen rarely polished, densely pubescent and usually fasciate, the ven- 

 ter with a long, dense pubescence; hind legs in £> with a long, dense, 

 whitish, griseous or yellowish scopa; tongue not greatly lengthened: 

 joints 2 and 3 of maxillary palpi almost twice as long as the first; first 

 joint of labial palpi longer than the second ; basal joint of hind tarsi 

 in % very long, strongly curved and produced into a long process 

 beyond the insertion of the second joint. 



Ancyloscelis Latr. = Diadasia Patton. 



22. Second submarginal cell, along the cubitus, longer than wide 23. 



Second submarginal cell, along the cubitus, wider (higher) than long and 



scarcely half the length of the first. 

 Transverse median nervure not interstitial, but joining the median vein a 

 little beyond the origin of the basal nervure; first recurrent nervure 

 interstitial or nearly with the second transverse cubitus ; second recur- 

 rent nervure received by the third cubital cell at its apex or just 

 before the third transverse cubitus; hind tibia? with a long, dense 

 scopa; maxillary palpi 6-jointed ; labial palpi 4-jointed. 



Exomalopsis Spinola. 



23. First recurrent nervure received by the second cubital cell a little before its 



middle, the second recurrent received by the third near its ape:: : 

 maxillary palpi 6-jointed; labial palpi? 2-jointed. 



Tetrapaulia Klug. 

 First recurrent nervure received by the second cubital cell distinctly beyond 

 its middle, or near its apex, nearly interstitial witli the second trans- 

 verse cubitus ; second recurrent nervure almost interstitial with the 

 third transverse cubitus ; basal depression of first segment bounded by 

 a transverse carina superiorly; maxillary palpi 6-jointed, joints 1-4 

 subequal in length, 2-6 shorter; clypeus in male yellow. 



IHadasiella Ashm. n. g. (Type D. coquilletti Ashm.). 



Family VI NOMADID^. 



(The Cuckoo Bees). 



To this family belong the cuckoo or parasitic bees, with three sub- 

 marginal cells in the front wings. Most of the species are bright 

 colored or metallic-blue or green, with the abdomen most frequently 

 marked with white pubescent macula?, banded, or ornate with yellow 

 or white. 



All, without exception, live parasitically in the nests of other bees, 



