AMERICAN HYMENOPTERA. 1(39 



Anterior coxae without bristles in front; front metatarsus without a boat- 

 shaped scale; apical margin of segment 6 with two teeth on each side: 

 claws without distinct basal teeth 4. 



4. Mandibular tooth hasal ; cheek beneath with a large scale-like process; front 



eoxte bare anteriorly, with large apical spines; front tarsi strongly 

 fringed, joint 1 hollowed out beneath; middle femur enormous ; seg- 

 ment 6 with strong deeply notched carina, apical margin with median 

 teeth stronger; 7 outwardly arcuate, sometimes slightly dentate; ven- 

 tral segments 4 Xaiithosarus. 



Mandibular tooth a little beyond the middle; cheek unarmed; front coxa? 

 with subapical spines; front and middle tarsi and hind ones more or 

 less red ; front tarsi hardly fringed ; joints 1-2 flattened, 3-5 simple: 

 segment 6 with two compressed teeth, apical margin with lateral teeth 

 stronger ; 7 inwardly arcuate ; apex of clypeus emarginate ; cheeks be- 

 neath with long white hair; pubescent fascia; more dense in basal 

 grooves; ventral segments 3 Ginatliodoii. 



5. Coxal spines strongly developed ; abdomen broad ; segment 6 with the carina 



transverse, strongly notched or denticulated ; mandibles 3-4 dentate. 



Megachile. 



Coxal spines not strongly developed ; mandibles 3-dentate 6. 



b'. Spines wanting; carina on segment (i high, entire or nearly so, the edge at 

 most slightly denticulated : apical margin with two lateral teeth ; 7 



pointed \ ill Illinois 



Spines reduced to short teeth or dentiform angles ; abdomen slender; segment 

 6 with the base gibbous, carina arcuate, moderately notched, apical 

 margin with lateral spine and inner dentiform carina; 7 rounded. 



Cyphopyga. 

 COELIOXY1N1. 



Females. 



Abdomen conical ; eyes hairy ; front coxte spined ; joint 1 of labial palpi shorter 

 than 2; mandibles tridentate; claws simple or with a blunt basal 

 tooth ('eelioxy s. 



Males. 



Eyes hairy ; front coxse spined ; segment 6 with 6-8 more or less evident spines. 



C'eelioxys. 



3. ANTHIDIINiE. 



ANTHIDIINI. 



Femn/rs. 



Pul villi absent ; mandibles 7-dentate ; wing hyaline ; section 2 of vein III shorter 

 than IIIi ; vein IV 2 a little beyond III 4 ; vein a well before V 2 ; orna- 

 ments pale yellow ... \ n I ii idi iim. 



Pulvilli present; mandibles 5-dentate; wings clouded ; section 2 of vein III about 

 as long as III, ; vein IV 2 well beyond III 4 ; vein « little before V 2 ; 

 ornaments orange-yellow or red IHantliMlium. 



TRANS. AM. ENT. SOC, XXIX. (22) APRIL. 1903 



