PAPERS ON ZOOLOGY 161 



— . Third antennal segment shorter than the fifth ; occiput usually 

 with black hairs dominating; malar space longer than its 

 width at apex ; first five dorsal abdominal segments yellow, 

 remaining two segments black fermdus subsq. dorsalis Cress. 



15. Occiput with yellow pubescence dominant; usually a large 



amount of dirty white or pale yellow pubescence above the 

 bases of the antennae ; middle anterior area of the clypeus 

 bare and glossy, with a few hairs on its anterior portion ; 

 yellow pubescence of the thorax and the abdomen a tawny 



yellow borealis Kirby. 



— . Occiput with black pubescence dominant ; pubescence about the 

 bases of the antennae black, or with black and light gray 

 hairs intermixed ; clypeus nearly covered over with pubes- 

 cence ; the yellow pubescence of the thorax and the abdomen 

 more of bright lemon yellow IG 



16. Black band between the bases of the wings usually narrow and 



distinct ; scutellum usually well covered over with yellow 

 pubescence ; first five dorsal abdominal segments yellow, the 

 two apical segments black ; yellow pubescence usually lemon 

 yellow in color; size medium (18-24 mm.) . . . ./err(rf(/s Fabr. 

 — . Black band between the bases of the wings more or less indis- 

 tinct ; scutellum usually with a large amount of black 

 pubescence ; first four dorsal abdominal segments usually 

 entirely yellow ; apical segments black, yellow, ferruginotis 

 or with combinations of these three colors ; pubescence more 

 or less dull yellow in color; size large (22-30mm. ) 

 pennsylvamcus DeGeer. 



Key for the Separation of the Queens of the Genus 

 Bremus from Illinois 



1. Anterior dorsal portion of the thorax yellow, a black band 



between the bases of the wings ; scutellum usually yellow, 

 but sometimes completely dominated by black pubescence .... 2 

 — . Dorsum of the thorax completely yellow, except for occasional 



black hairs about the center of the disk 12 



2. Third, fourth, fifth and sixth dorsal abdominal segments black 3 

 — . Third, fourth, fifth and sixth dorsal abdominal segments not 



entirely black 4 



3. Occiput of the head bearing black pubescence, or with only a 



few yellow hairs intermixed ; ocelli placed well below the 

 supra-orbital line; second dorsal abdominal segment entirely 



yellow; of large size (20-2Smm.) f rat emus F. Sm. 



— . Occiput of the head bearing mostly yellow pubescence ; ocelli 

 slightly below the supra-orbital line ; second dorsal abdominal 

 segment usually with black on its side margins; of small 

 to medium size (14-16mm.) rufocinctus Cress. 



4. The first four dorsal abdominal segments entirely yellow ; fifth 



and sixth segments black 5 



— . Dorsal abdominal segments not so colored G 



5. Occiput and face with considerable light yellowish pubescence ; 



the middle anterior portion of the clypeus smooth and 

 glossy J)arealis Kirby. 



— . Occiput and face with black pubescence ; clypeus with middle 

 portion more or less punctate, and as a rule not glossy 

 fervidus Fabr. 



6. Second and third dorsal abdominal segments entirel.v yellow, 



first segment either yellow, black or both, remaining three 

 segments black 7 



