INVESTIGATIONS ON THE MUTILLID WASPS 51 



84. Pygidium irregularly rugose; genae with rather large, confluent punctures; 



eyes of moderate size, the distance between the eye margins and the 

 postero-lateral angles of the head equal to one-half the greatest diameter of 



the eyes scitula (p. 244). 



Pygidium lon^tudiually rugose ; genae with small, well-separated punctures ; 

 eyes large, the distance between the eye margins and the postero-lateral 

 angles of the head not greater than one-third the greatest diameter of the 

 eyes arenivaga (p. 278) . 



85. Pygidium granulate; thorax pyriform, scutellar scale absent 87. 



Pygidium longitudinally striate; thorax subhexagonal, scutellar scale 



present ^"■ 



86. Pubescence of head, thorax, and abdomen concolorous; legs clothed with 



white hairs l^elva (p. 259). 



Pubescence of head and thorax black, of abdomen fulvous ; legs clothed with 

 black hairs nogalensis (p. 258). 



87. Postero-lateral angles of head carinate 88. 



Postero-lateral angles of head rounded ^ 89. 



88. Carina of postero-lateral angles somewhat crenulate ; apical margin of second 



abdominal tergite with pale silvery pubescence at the middle. 



dilucida (p. 267). 

 Carina of postero-lateral angles not crenulate, straight; apical margin of 

 second abdominal tergite with a broad band of black pubescence. 



chrysocoma (p. 266). 



89. Antennal scrobes distinctly carinate above heliophila (p. 265). 



Antennal scrobes not carinate above 90- 



90. Pubescence of head and thorax sparse, the sculpturing not concealed. 



ohscura (p. 261). 

 Pubescence of head and thorax dense, concealing the sculpture. 



poecilonota (p. 264). 



Males 



1. Apices of middle and hind femora squarely truncate, the surface of the 



truncations sulcate ; clypeus very prominently bidentate medially 71. 



Apices of middle and hind femora more or less rounded not modified as 

 above; clypeus feebly bidentate medially 2. 



2. Posteiior trochanters produced at the apex within, into a prominent blunt 



tooth 3. 



Posterior trochanters simple, not produced within 5. 



3. Second abdominal sternite convex, not at all scabrose; pygidial area 



pubescent throughout creon (p. 2T6). 



Second abdominal sternite concave, the sides and apex scabrose; pygidial 

 area bare 4. 



4. Body black eminentia (p. 79), 



Body ferruginous furina (p. 82). 



5. Ventral surface of posterior tibiae very greatly flattened distinctly 



ai'cuate 6. 



Posterior tibiae cylindrical, ventral surface not flattened- 8. 



6. Mesonotum clothed with black pubescence; head, pronotum, scutellum, and 



metanotum with pale pubescence 7. 



Head, pronotum, mesonotum, scutellum, and metanotum with scarlet pubes- 

 cence foxi (p. 84). 



