FIELD BOOK OF INSECTS. 



5. No distinct interalar, black band 6. 



Black interalar band 9. 



6. First to fourth abdominal segments largely yellow. 



B. Jervidus dor sails. 

 Third and fourth segments largely black 7. 



7. Ocelli large, the lateral ones farther from each other 

 than from the margins of the eyes and below the supra- 

 orbital line ; occiput and face largely black ; first abdominal 

 segment yellow, the others black except for (usually) 

 brownish at the middle of the base of the second 



B. B. separatus. 

 Ocelli small 8. 



8. First abdominal segment yellow, second and following 

 segments without yellow; occiput largely yellow; face 

 wide and largely black B. impatiens (Plate XCIV). 



First abdominal segment yellow, some yellow at basal 

 middle of the second, otherwise the abdomen black; 



occiput largely yellow; face long, triangular, black 



B. bimaculatus. 



First abdominal segment largely yellow; the yellow 7 

 which largely covers the second segment is notched in the 

 middle behind and, in the workers, usually mixed with 

 red; third to fifth black; frequently considerable interalar 

 black; occiput largely black; face wide and black; pleura 

 yellow B. affinis. 



First and second segments largely yellow and re- 

 mainder of abdomen largely black ; disk of thorax not nude 

 and without black; pleura usually black; occiput largely 

 yellow; face largely black B. perplexus. 



First and usually the second abdominal segments 

 yellow, the remainder usually largely black; pleura yellow; 

 disk nude and with scattered, black hairs; occiput largely 

 yellow in queens and usually so in w r orkers; face long and 

 largely black B. vagans. 



9. Second and third abdominal segments red, second and 

 fourth largely yellow, the remainder black 



B. ternarius (Plate XCIV). 

 Third and following segments black, the first two 



largely yellow 10. 



Third segment yellow 1 1. 



10. Ocelli large, separated from each other, and below 



450 



