196 AMERICAN HYMENOPTERA. 



PLATE X. 

 Fig. l\.—Bombus {Bombias) frateruus, ventral aspect of left side of 



genitalia. xl7. 

 " 72. — Bombus impatie?is, dorsal aspect of end of left clasper. x20. 

 " 73. — Bombus [Bombias) iievadensis, ventral aspect of right side 



of genitalia. x20. 

 " 74. — Bombus fernaldi, new name. Dorsal aspect of end of left 



clasper. x20. 

 " IS.— Psithyrus laboriosus, ventral aspect of base of genitalia with 



spathas removed. x20. 

 ' ' 76. — Bombus perplexus, ventral aspect of end of right clasper. x20. 

 " 11 .—Bombus kirbyelius, dorsal aspect of left clasper of male. xl7. 

 " 78. — Bombus californicus Smith. Dorsal aspect of end of left 



clasper. x20. 

 " 79. — Bombus [Bombias) ru/ocinctus, ventral aspect of right side 



of genitalia. x20. 

 " SO.— Botnbus [Bombias) fraterTtus, head of sagittaof genitalia. x40. 

 " 81. — Bombus [Bombias) crotchii Cresson. Ventral aspect of right 



side of genitalia. x20. 



PLATE XL 

 Fig. 82. — Bombus [Bombias) nevadensis, dorsal aspect of left clasper. 



x20. 

 " 83. — Bom.bus [Bombias) auricomus, dorsal aspect of left side of 



genitalia. x20. 

 " 84. — Bombus [Bombias) rufocinctiis, dorsal aspect of left side of 



genitalia. x20. 

 " 85. — Bombus [Botnbias) separaius Cre?,s,on. Dorsal aspect of left 



side of genitalia. x20. 

 " 86. — Bombus [Bombias) morrisoni, dorsal aspect of left side of 



genitalia. x20. 

 ' ' 87. — Bombus [Bombias) fraternus, dorsal aspect of left clasper. xl7. 

 " 88. — Bombus [Bombias) crotchii, dorsal aspect of end of left 



clasper and sagitta. x20. 

 " 89. — Bombus [Bombias) morrisoni, ventral aspect of right side of 



genitalia. x20. 

 " 90. — Bombus [Bombias) separatus, ventral aspect of right side of 



genitalia. x20. 



PLATE XIL 

 Fig. 91. — Psithyrus suckleyi, new species. Dorsal aspect of left clasper 

 of genitalia. x20. 

 " 92. — Psithyrus ashtojii , dorsal aspect of left side of genitalia. x20. 

 " 93. — Psithyrus variabilis, dorsal aspect of left clasper of genitalia. 

 x20. 



