HENRY J. FRANKLIN. 79 



Other dorsal segments than the third bearing yellow pile, the third 

 either yellow or black 42. 



38. Dorsum of thorax unicolorous 39. 



Dorsum of thorax bicolored 41. 



39. Dorsum of thorax black 40. 



Dorsum of thorax yellow steiiidachiieri. 



40. Malar space nearly one-fourth as long as the eye niexicanus. 



Malar space but little more than one-fifth as long as the eye. 



inedins. 



41. Black interalar band more than half as wide (from front margin 



to rear margin) as long (from wing base to wing base). 



inediiis. 

 Interalar band not more than half as wide as long iiicarum. 



42. Dorsum of thorax unicolorous 43. 



Dorsum of thorax bicolored 45. 



43. Dorsum of thorax yellow 44. 



Dorsum of thorax dark ephippiatns. 



44. The two basal dorsal abdominal segments entirely covered with 



yellow pile morrisoiii. 



The two basal dorsal segments not entirely yellow. 



steindaclmeri. 



45. All the dorsal abdominal segments beyond the second entirely 



dark 46. 



One of the dorsal segments beyond the second partly or entirely 

 clothed with yellow pile 47. 



46. Scutellum and first dorsal abdominal segment with little or no 



light or yellow pile crotchii. 



Scutellum and first dorsal segment clothed with entirely or mostly 

 yellow pile fraternus. 



47. Pleura yellow 48. 



Pleura black 49. 



48. Third dorsal abdominal segment clothed with yellow pile from 



side margin to side margin bra.siliensis. 



Third dorsal segment bearing yellow pile on its middle portion 

 only , .^.viliiiattae. 



49. Scutellum and first dorsal abdominal segment well clothed with 



yellow pile soiiorns. 



Scutellum usually either mostly or entirely dark and the first dorsal 

 segment usually with considerable black pile on its front 

 portion peiiiisylvaiiicus. 



TRANS. AM. ENT. SOC, XXXIX. 



