Effects of Pesticide on C. nipponicus.....................................................37
 Effects of Pesticide on R. lophanthae ....................... ........ ............ 37
 D isc u ssio n ............................................................................................................. 3 7

4 THE CYBOCEPHALIDAE (COLEOPTERA) OF AMERICA NORTH OF
 M E X IC O .......................................................4 2

 In tro d u ctio n .......................................................................................4 2
 Taxonom ic History ......................... ........................ ..... ..... 45
 M materials and M methods ....................................................................... ..................46
 M a te ria ls ...................................................................................................4 6
 M e th o d s ...........................................................................4 7
 D definitions ..........................................................................48
 Cybocephalus Erichson 1844 ............................................................49
 Key to the species of Cybocephalus of America north of Mexico ...........................49
 Cybocephalus californicus Horn ......................................................... 50
 Cybocephalus kathrynae T. R. Smith, New Species..........................................60
 Cybocephalus nigritulus LeConte ................. ................. .............................63
 Cybocephalus nipponicus Endrdy-Younga ..................................... ...............68
 Cybocephalus randalli T. R. Smith, New Species .......................................... 73

5 THE CYBOCEPHALIDAE (COLEOPTERA) OF THE WEST INDIES AND
 T R IN ID A D ........................................................................................................... 9 1

 In tro d u ctio n ................................................................... ................................ 9 1
 M materials an d M eth od s ......................................................................................... 92
 M materials ...................................... ................................................ 9 2
 M e th o d s ...........................................................................9 3
 Definitions ........................................ ........................93
 Key to the Cybocephalidae of the West Indies and Trinidad .............. ............... 93
 Cybocephalus Erichson 1844 ........................................................... ................. 94
 Cybocephalus antilleus T. R. Smith, New Species ............................................ 94
 Cybocephalus caribaeus T. R. Smith, New Species ..................................... 96
 Cybocephalus iviei T. R. Smith, New Species ........................................ ....99
 Cybocephalus nipponicus Endr6dy-Younga .................................... .....102
 Cybocephalus geoffreysmithi T. R. Smith, New Species ......................................103
 Pycnocephalus Sharp 1891................................ ........................105
 Pycnocephalus deyrollei (Reitter), New Combination ............................................106

6 THE CYBOCEPHALIDAE (COLEOPTERA) OF MEXICO .............................119

 In tro d u c tio n ......................................................................................................... 1 1 9
 M material and M methods .......................................................................... ............... 119
 M ateria ls .......................................................................................... 1 19
 M e th o d s ................... .............................................................................. 12 0
 D definitions ............................................................0... ......120
 Key to the Cybocephalidae of Mexico ...................................................121