244 WILLIAM J. FOX. 



SECTION 11. 



FEMALES. 



1. — Greater part of femora reddish distinct US. 



Greater part of femora or the legs entirely black 2. 



2. — First joint of fore tarsi much contracted basally, apical |iortion of first three 



abdominal segments silvery contractus. 



First joint of fore tarsi not contracted 3. 



3. — First two dorsal segments of abdomen, apically, silvery; legs, except tarsi, 

 black, the tibiae with dense silvery pubescence; metanotum distinctly 



punctured aurulentus. 



First four or five segments silvery 4. 



4. — Space between eyes at top about equal to length of joints 2 and 3 of anteunse 



united 5. 



Space between eyes at top greater than length of joints of the anteunse 2 and 



3 united 6. 



5. — Abdomen reddish, or red and black : hind tibise armed outwardly with a 



series of short, black, stout and blunt thorns abdoniiiialis. 



Abdomen black ; posterior tibife armed outwardly with a series of whitish, 



long and rather acute thorns sericatus. 



6. — Mandibles very broad and flat, with an exceedingly narrow notch ; abdomen 



black obscurus. 



Mandibles of the normal form, with abroad notch. 7. 



7. — Metanotum not at all furrowed ; abdomen varying from red and black to 



entirely ferruginous; size also variable rufbfasciatus. 



Metanotum more or less furrowed 8. 



8. — Space between eyes at top greater than the length of antennal joints 2 and 



3 united; clypeus not dentate obfluctus. 



Space between eyes at top a little less than the length of second and third 

 antennal joints united; clypeus armed with a large prong on each side. 



niergus. 



MALES. 



1. — Wings yellow, with the apical portion dark 2. 



Wings not yellow, hyaline or subhyaline 3. 



2. — Third joint of antennse nearly one-third longer than the fourth ; metanotum 



distinctly punctured ; tibise and tarsi black aiiriilentus. 



Third joint of antennae but little longer than the fourth ; metanotum not 

 punctured ; apex of femora, tibiae and tarsi yellow ferruginous. 



eloiigatus. 



3. — Abdomen and legs more or less red 4. 



Abdomen and legs black 5. 



4. — Third joint of antennae in length about equal to the fourth ; metanotum 



slightly furrowed; femora, except base, reddish ruTofasciatus. 



Third antennal joint shorter than tlie fourth ; metanotum not furrowed ; 



femora, except apex, black iniiiinius. 



.5. — Space between eyes at top much less than the length of antennal joints 2 — 4 



united 6. 



Space between eyes at top about equal to the length of antennal joints 2 — 4 



united; apical margins of the wings fuscous parvus. 



6 — Notch on outer edge of mandibles very narrow; body not densely silvery 



sericeous obscurus. 



Notch on outer edge of mandibles as usual ; body rather densely clothed with 

 silvery sericeous pile sericatus. 



