CLASSIFICATION OF THE BEES. 00 



9 with a dense polleniferous scopa on hind tibise and tarsi; body clothed 

 with a dense pubescence: maxillary palpi 2-6 jointed. 



Fam. V. ANTH0PH0RID7E. 



9 without a polleniferous scopa or at most with a thin, sparse flocculus on 



hind tibise; body most frequently bare or nearly; the pubescence, if 



any, short and sparse, rarely densely pubescent ; species often metallic 



or rufous and black, the abdomen most frequently ornate, with white 



or yellow maculae or bands Fam. VI. NOMADIILE. 



Marginal cell long and narrow, usually as long or longer than the three sub- 

 marginal cells united. 

 Hind tibiae and tarsi with a sparse pubescense, but without a distinct scopa ; 

 maxillary palpi usually 6-jointed ; body metallic or submetallic, nearly 

 bare; abdomen elongate, subcylindrical, the segments more or less 



constricted at sutures. Small species Fam. VII. CEBATTNID^E. 



Hind tibiae and tarsi with a dense scopa; maxillary palpi 5-6-jointed, rarely 

 wanting; thorax more or less densely pubescent, at least laterally; 

 abdomen not elongate, with a scopa beneath : eyes in % often strongly 

 convergent above Fam. VIII. XYLOCOPIL\E. 



5. Lab rum large and free, uncovered ; maxillary palpi 4, 5 or 6-jointed (rarely 



wanting Oxzea) ; body densely pubescent, the hind legs with a dense 



scopa ; ventral scopa present. 



Marginal cell neither long nor narrow. .Fam. V. ANTHOPHORIDiE (pars). 



Marginal cell very long and narrow- • • -Fam. VIII. XYLOCOPIDiE (pars). 



Labrum not large and free, most frequently entirely covered by the clypeus 



(Megachilidse), or, if somewhat visible, then strongly inflexed (Stelididae). 



Abdomen in 9 with a ventral scopa; labrum entirely covered by the clypeus. 



Fam. IX. MEGACHILID.E. 

 Abdomen in 9 without a ventral scopa; labrum more or less visible, not 

 entirely covered by the clypeus, strongly inflexed. 



Fam. X. STELIDID.E. 



6. Labium or tongue short, broad, obtuse or emarginate at apex, never acute 



medially ; hind femora with or without a distinct golden brush or 



flocculus 7. 



Labium or tongue long or short, but always acute medially at apex ; hind 

 femora always with a pollen brush or flocculus, rarely very thin 

 and sparse. 



Front wings with two submarginal cells; labium or tongue long or short, 

 usually, however, narrowed and longer than the mentum ; labrum 

 rather large, distinct, not covered by the clypeus, but most frequently 

 inflexed Fam. XL PANURGIDiE. 



Front wings with three submarginal cells; labium or tongue shorter or not 

 longer than the mentum, triangular, not narrowed, rarely long; lab- 

 rum not free, more or less hidden by the clypeus, or with basal pro- 

 cesses always visible Fam. XII. ANDRENlDzE. 



7. Front wings with three submarginal cell ; head and thorax more or less 



clothed with a dense pubescence; second recurrent nervu re often more 

 or less sinuate ; lingua at apex rather deeply triangularly emarginate ; 

 hind femora in 9 with a pollen brush or flocculus. 



Fam. XIII. COLLETID.E. 



TEANS. AM. ENT. SOC. XXVI. MAY. 1899. 



