CLASSIFICATION OF THE BEES. 85 



Claws in 9 simple, in % with the anterior and middle claws cleft, the hind 

 claws simple Coclterellia Ashni. (Type /'. hyalina Cr., albipewnis Cr.). .. 



Claws in both sexes cleft Neoperdita Ashni. (Type P. zebrata Cr.). 



10. Marginal cell short, not longer than the stigma, usually shorter, the stigma 

 large, well developed. 

 Head seen from in front rounded, or a little longer than wide, rarely wider 

 than long; clypeus somewhat produced, truncate anteriorly, the 

 labrum distinct, transverse ; labial palpi 4- join ted, the first joint the 

 longest, but rarely longer or much longer than joints 2-4 united ; claws 



cleft I'erdila Smith (Type P. halictoides Smith |. 



Marginal cell long, always much longer than the stigma. 



Stigma rather small or narrow, lanceolate; head large, seen from in front 



usually much wider than long ; tongue very long ; labial palpi 4-jointed, 



the first joint very much longer than joints 2-4 united ; claws cleft ; 



hind tibial spurs finely serrate; antennae short, scarcely as long as the 



width of the head Macrotera Smith. 



Stigma broad, oblong-oval, or at least not lanceolate: head normal, as seen 

 from in front rounded, not or very little wider than long; antennas 

 longer than the width of the head. 

 First cubital cell, along the cubitus, not greatly longer than the second. 

 Hind tibiae and tarsi in 9 with a long, dense pubescence: clypeus in % 

 black, with long hairs; legs black ; labial palpi 4-jointed, the first joint 

 very long, usually longer than 2-4 united; abdomen without hair 



fascias Paiiurgus Latr. 



Hind tibiae and tarsi in 9 with a short, rather sparse pubescence; cly- 

 peus in % usually yellow or marked with yellow, hardly pubescent; 

 legs black, varied with yellow; labial palpi 4-jointed, the first about 

 as long as joints 2-4 united or somewhat longer. 



Mesopleura bare or nearly; stigma in front wings very large, oval or 

 elliptical ; abdomen punctate, most frequently black, rarely rufous or 

 rufous and black, the dorsal segments never with apical hair fasciae. 



I'm 11 11 rgi 11 11* Nyl. = Pseudopanurgus Ckll. 



Mesopleura with a whitish or cinereous pubescence; stigma in front 



wings narrower, not so large; abdomen black or aeneous black, im- 



punctured, or at most finely shagreened, the dorsal segments with 



hair fasciae at apex, although sometimes interrupted. 



< alliopsi*. Smith (Type C. andreniformis Sin.). 



First cubital cell, along the cubitus, about twice, or nearly, as long as the 



second; each cubital cell receiving a recurrent nervure; transverse 



median joining the median vein much before the origin of the basal. 



Scapteruides Gribods. 



11. Median and submedian cells of an unequal length, the transverse median 



nervure uniting with the median vein somewhat before the origin of 



the basal nervure; claws cleft. 



Stigma large, broad, well developed, the marginal cell not short, longer than 



the first discoidal cell 12. 



Stigma neither large nor broad, sublanceolate, the marginal cell short, 

 obliquely truncate at apex and not quite as long as the first discoidal 

 cell; second cubital cell narrowed one-half or more above ; head seen 

 from in front much broader than long: palpi as in Macrotera Smith 

 abdomen in 9 black, in % red. 



Macroteropsis Ashm. n. g. (Type Perdita Icetior Ckll.). 



TRANS. AM. ENT. SOC. XXVI. JUNE, 1899. 



