soyne Parasitic Bees. 35 



antennal joints largely red; lower 



half of pleura covered with hair .... beulahensis, Ckll. 



6. Legs black 7. 



Legs red 8. 



7. Larger; black area on first segment 



narrow, i. e. not much produced 



laterally nevadensis, Cress. 



Smaller; black area on first segment 

 very broad donatus, Smith. 



8. Scutellar teeth long and sharply 



pointed, at least partly red ; dark area 



on disk of first segment very small. . 9. 



Scutellar teeth shorter, entirely black . 10. 



9. Larger; mesothorax mainly red .... pitnarum, , Ckll. 

 Smaller; mesothorax black mesillce, Ckll. 



10. Area on first segment a broad trans- 



verse band 11. 



Area on first segment small, not pro- 

 duced laterally ; size large texanus, Cress. 



11. Tegulse clear light red; mesothorax 



with an anterior patch, not two dis- 

 tinct stripes occidentals, Cress. 



Tegulae dark reddish to dark fuscous ; 



mesothorax with two distinct stripes. 12. 



12. Larger; labrum entirely black helianthi, Rob., var. 



Smaller; labrum with two red spots. . helianthi, Rob. 



Males. 



Abdomen with eight club-shaped light 



marks verbesince, Ckll. 



Abdomen not so marked 1. 



1. Markings of abdomen orange, white on 



sixth segment nautlanm, Ckll. 



Markings of abdomen white or pale 

 cream-colour 2. 



2. Mark on first abdominal segment semi- 



lunar 3. 



Mark on first abdominal segment a 



transverse band 4. 



3. Legs black concolor, Rob. 



Legs red lunatus, Say. 



4. Bands on second to fourth segments 



interrupted in middle line ; size 



small ; femora black olympiellus, Ckll. 



Bands on third and fourth segments, at 

 least, entire ; hind femora, at least, 

 red 5. 



5. Lower part of pleura bare G. 



Lower part of pleura covered with hair. 7. 



0. Larger ; tegulas clear red occidentalis, Cress. 



Smaller; tegulae darkened helianthi, var. arizonensis, 



7. Anterior femora red; abdominal mark- [Ckll. 



ings white isocomce, Ckll. 



Anterior femora black ; abdominal 

 markings cream - colour ; antennae 

 black Cressoni, var. fraserce, Ckll. 



3* 



