80 WM. H. ASHMEAD. 



Clypeus lengthened and deeply emarginate; maxillary palpi 1 -join ted ; 

 abdomen longer, cylindrical, with large white spots, in 9 with the 

 apical margin of the sixth segment toothed, in % with the seventh 

 armed with a tooth HI el idoiiiorphu Moraw. 



3. Clypeus rounded, not lengthened ; maxillary palpi 2-jointed ; abdomen rounded 



or oval, black, rarely with small, indistinct maculae; % with the 

 seventh segment rounded Stelis Panzer. 



4. Apex of scutellum with a deep median depression ; maxillary palpi 2-jointed ; 



labial palpi 4-joiuted ; mandibles 3-dentate; apical abdominal segment 

 in t, tridentate Parevaspis Ritsema. 



Subfamily II. CcELIOXIlOE. 



The bees composing this group are very much commoner and much 

 more numerous in genera and species than are the Stelidinse. Their 

 habitus also is quite different; as a rule, more robust, less ornate, 

 black, or at most with a rufous abdomen, the segments being some- 

 what constricted at sutures, or, if not, the abdomen is acutely pointed 

 at apex ; claws always without pulvilli between. 



Dr. Friese suggests that Oclioxys, Dioxys, etc., originated from 

 Wegachile. 



The genera are fairly numerous, separated as follow.- : 



T'lhfe of Genera. 



Marginal cell at apex mure or le.ss remote from the costa, or somewhat truncate' •'-'. 

 .Marginal cell at apex attaining the costa. 



Median and submedian cells about equal ; mandibles simple ; hind femora 



normal H y poch rot «e ilia Hblmberg. 



Median and submedian cells unequal: mandibles at apex bidentate; hind 

 femora much swollen, their tibise dilated, the tarsi very long. 



(Ediscelis Philippi. 

 '.'. Marginal cell at apex acuminate or narrowly rounded ; mandibles usually 



dentate 3. 



Marginal cell at apex truncate or broadly rounded most frequently with a 

 slight appeudage; mandibles acute or at least not dentate: abdomen 



rufous or rufous and black, ornate, rarely entirely black 5. 



3. First cubital cell distinctly longer than the second 8. 



First cubital cell not longer than the second, equal or distinctly shorter ; third 



antennal joint normal 4. 



1. First cubital cell equal to the second or only slightly shorter: second cubital 

 cell receiving both recurrent nervures, the first near its basal angle, the 

 second before its apex : submedian cell much longer than the median : 

 abdomen short, elliptic or oval-lanceolate; labial palpi 4-jointed. the 

 first more than twice longer than the second, obconical, the last hardly 



longer than the third, fusiform PMeuflopeoIus Holmberg. 



First cubital cell distinctly shorter than the second, the latter receiving both 

 recurrent nervures, the first at its basal third, the second just before 

 the second transverse cubitus; submedian and median cells of an 

 equal length : abdomen oval Biastes Panzer 



