HKNRY J. FRANKLIN. 2!57 



Pleura not shaded, as light as anterior part of thoracic dorsum ; 

 three apical segments largely covered with light yellow (or 

 ferruginous-red) pile kirbyellus. 



20. Pleura black or strongly shaded by admixture of dark hairs, which 



usually predominate 23. 



Pleura not strongly shaded by admixture of dark hairs ; not notice- 

 ably darker than anterior part of thorax above 24. 



21. Occiput with very little or no light or yellow pile 39. 



Occiput with considerable light or yellow pile 40. 



22. First four dorsal segments of the abdomen covered with tawny or 



yellow pile 33 . 



Not all the first four segments thus covered 35. 



23. First two dorsal abdominal segments entirely covered with yellow 



pile ; apical segments with rather long, loose pile 25. 



First two dorsal abdominal segments not both entirely covered 

 with yellow pile ; pile of apical segments rather short and 

 dense 17. 



24. Second dorsal abdominal segment entirely covered with yellow 



pile 27. 



Second abdominal segment wholly or partly covered with black or 

 ferruginous pile 28. 



25. Posterior metatarsi with long, loose hairs on hind margin 26. 



Posterior metatarsi not with long hairs on posterior margin. 



penusylvanicus. 



26. Sides of head behind the eyes with little or no light or yellow pile. 



strenuus. 



Sides of head behind the eyes with considerable light or yellow 



pile polaris. 



27. Third and fourth dorsal abdominal segments entirely covered with 



ferruginous-red pile flavifrons and centralis. 



Third and fourth dorsal abdominal segments not both entirely 

 covered with ferruginous-red pile 29. 



28. Sides of head behind the eyes with very little or no light or yellow 



pile 30. 



Sides of head behind eyes with considerable light or yellow pile..32. 



29. Third dorsal abdominal segment entirely covered with yellow 



pile 46. 



Third abdominal segment not entirely covered with yellow pile..48. 



30. Second and third dorsal abdominal segments with ferruginous-red 



pile 66. 



Abdomen without ferruginous pile above 31. 



31. Apical dorsal abdominal segments covered with white pile. 



occidentalis. 

 Apical abdominal segments not bearing white pile inipatiens. 



32. Black interalar band present 51. 



Black interalar band absent 52. 



TRANS. AM. ENT. SOC, XXXVIII. (33) 



