AMERICAN HYMENOPTERA. 175 



3. ANTHIDIIN.5]. 



ANTHIDIINI. 



ANTH1DIUM Fabricius. 



Females. 



A longitudinal stripe on each side of vertex ; face, clypeus, mandibles and bases 

 of tibiae black ; segments 2-5 with lateral fasciae greatly indented an- 

 teriorly ; apex of clypeus with two teeth on each side • • • psoralese. 



A transverse stripe on each side of vertex ; face, clypeus, mandibles and bases of 

 tibia? marked with yellowish ; segments 2-4 with two spots on each 

 side cognatum. 



Males. 



Lateral spines on segment 7 with incurved points; ventral segments 4-5 emargi- 

 nate; 6 with broad produced median portion having the sides of its 

 base sinuate; longitudinal stripe on each side of vertex; segment 6 

 with two discal comma-shaped marks psoralese. 



Lateral spines on segment 7 broadly rounded ; ventral segment 4 with one, b' 

 with three compressed apical teeth ; scape in front, transverse stripe 

 on each side of vertex, stripe on anterior and middle tibiae, spot on 

 base of bind ones, two discal suhquadrate spots on segment 6, yellow- 

 ish cognatum . 



IHA\ THIDII M Cockerell. 

 Male. 



Segment 6 with a median raised line, on each side an elevated portion termina- 

 ting in a discal subapical tooth and a lateral apical one ; 7 einarginate. 

 with a median carina terminating in a tubercle boreale. 



STELIDINI. 



Steiidhun trypetinum Rob. 



9IICROSTEL.IS gn. nov. (Type Stdis lateralis Cressou). 



Females. 



Abdomen with narrow fasciae continuous or interrupted ; vein IV 2 usually before 



III 4 fcederalis. 



Abdomen 8-14 spotted ; vein IV 2 usually opposite or beyond III 4 • ■ • lateralis. 



Males. 



Ventral segment 3 with a median apical dentiform carina; dorsal segments 1-5 



with narrow continuous or interrupted fasciae fcederalis. 



Ventral segment 3 simple; dorsal segments 1-5 with lateral spots • • • lateralis. 



TRANS. AM. ENT. SOC, XXIX. APRIL, 1903 



