HENRY J. FRANKLIN. 195 



Fig. ^S.—Bombus perplex us, outline of inner aspect of left mandible of 

 queen. xl7. 



" 46. — Psithyrus interruptus. outline of inner aspect of right mandi- 

 ble of female. xl7. 



" 47. — Bombus perple.rus, outline of tegula of queen, xll. 



" 48. — Psithyrus latitarsus, outline of inner aspect of end of right 

 posterior tibia of female. xl7. 



" 49. — Psithyrus latitarsus, outline of inner aspect of right mandible 

 of female. xl7. 



" 50. — Bo)nbus dahlbomii GvL&rm. Side piece connected with sting 

 sheath of female. x9. 



" 51. — Bombus perplexus, outline of labrum of male. xl7 



" 52. — Bombus vagans, base of fore wing of queen. x20. 



PLATE VIII. 

 Fig. 53. — Bombus {Bombias) fraterinis. head of queen. x5. 



" 54. — Psithyrus tricolor, new name. Ventral aspect of outer spatha 



of male. x26. 

 " 55. — Bombus {Bombias) rufocinctus Cresson. Inner spatha of 



male. x26. 

 " 56. — Bombus sp. Spots on an area of sensitive portion of antenna. 



x360. 

 " 57. — Psithyrus laboriosus, o\xW\x\Q oiX^hrwvn oi xnaXe. x26. 

 ' ' 58. — Bombus affi?iis, lateral aspect of tip of antenna of worker. x26. 

 " 59. — Psithyrus variabilis {Cresson) . Inner spatha of male. x26. 

 " 60. — Psithyrus ashtoni (Cresson). Ventral aspect of outer spatha. 



x26. 



PLATE IX. 



Fig. 61. — Bo>Hbus borealis Kirby. Ventral aspect of left side of geni- 

 talia of male. x20. 



" 62. — Bombus impatiens, ventral aspect of end of clasper of male. 

 x20. 



" 63. — Bombus kirbyellus Curtis. Ventral aspect of right side of 

 genitalia of male. xl7. 



" 64. — Bombus vagatis, dorsal aspect of right side of genitalia. x20. 



" 65. — Bombus ternarius, dorsal aspect of left side of genitalia. 

 x20. 



" 66. — Bombus pennsylvanicus, dorsal aspect of left side of genitalia. 

 x20. 



" 67. — Bombus vagans. ventral aspect of right side of genitalia x20. 



" 68. — Bombus borealis, dorsal aspect of left side of genitalia. x20. 



' ' 69. — Bombus perplexus, dorsal aspect of end of right clasper. x20. 



" 70. — Boynbus pennsylvanicus, ventral aspect of right side of geni- 

 talia. x20. 



TRANS. AM. KNT. SOC, XXXIX. 



