90 WM. H. ASHMEAD. 



Marginal cell more or less narrowly rounded at apex, its extreme tip not 

 attaining the costa ; submedian cell fully as long as the median, the 

 transverse median nervure interstitial. 



Second cubital cell a little longer than wide, receiving the first recurrent 

 nervure a little beyond the middle, rarely at the middle: the third 

 cubital cell receiving the second recurrent far beyond the middle; 

 abdomen most frequently fasciate or subfasciate with hair bands, 

 more rarely bare; pygidial plate subtriangular, usually subtruncate 

 at apex; maxillary palpi 6-jointed. labial palpi 4-jointed ; superorbital 

 fovea very large, broad, represented by broad depressions along the 

 inner upper orbits Aiulrona Latr. 



Second cubital cell receiving the first recurrent nervure at the middle, the 

 second recurrent received by the third cubital cell at its middle; mid- 

 dle tibial spur and the longer spur of hind tibiae, which is very long 

 and bent, serrated ; maxillary palpi 6-jointed, labial palpi 4-jointed. 



Steiiotritus Smith. 



Second cubital cell wider (higher) than long, narrowed above; along the 

 cubitus about half as long as the first cubital cell, and reaching the 

 first recurrent nervure near the apex ; abdomen fasciate; hind tibiae 

 in 1, strongly curved and angulately dilated at apex beneath. 



Anoy la Lepel. = Prislotrichia Radoszk. 



Subfamily II. Halictin^e. 



The bees belonging to this subfamily agree with the Andreninae 

 in all essential characters, but the basal nervure in the front wings 

 is always strongly curved or bent inwardly towards base of the wing, 

 the epimera of the mesothorax well separated, distinct, while the 

 apical dorsal segment in the 9 always has a distinct riraa,or median 

 grooved furrow on its disk. 



The tongue may be either long or short. The rima on the last 

 dorsal segment, and the distinct scopa or flocculus on hind legs in 9 

 must be depended upon to separate these bees from the Sphecodinse. 



Eleven genera are known, recognizable by the aid of the following 

 table : 



Table of Genera. 



First cubital cell, along the cubitus, distinctly longer than the third, or as long 

 as the second and third united ; stigma well developed ; transverse 



median nervure never not angulated 2. 



First cubital cell, along the cubitus, as long or very nearly as loug as the third ; 

 stigma not well developed ; transverse median nervure angulated ; 

 maxillary palpi 6-jointed. 

 Vbdoinen black, densely pubescent; antennae in 9 short, clavate, in % 

 involute at apex, the last joint triangular; labial palpi 4-jointed. 



Systropha Latreille. 



