soap, fish oils, and imidacloprid were much less toxic. At half the simulated field rate, C.

nipponicus had 33% survivorship with insecticidal soap, 23% survivorship with

imidacloprid, and 17% survivorship with fish oil. At half the simulated field rate, R.

lophanthae had 56% survivorship with insecticidal soap, 36% survivorship with

imidacloprid, and 53% survivorship with fish oil. Mortality rate for each beetle species

rose with increasing concentration of each pesticide.

 The 17 species of Cybocephalidae in North America (including Mexico) and the

West Indies are revised. Included are redescriptions of Cybocephalus aciculatus

Champion, C. californicus Horn, C. nigritulus LeConte, C. nipponicus Endrody-Younga,

C. schwarzi Champion, Pycnocephalus metallicus Sharp and a new combination of P.

deyrolli (Reitter). Also included are descriptions of 10 new species: C. antilleus, C.

caribaeus, C. iviei, C. kathrynae, C. randalli, C. geoffreysmithi and four as yet unnamed

new species from Mexico. A key to species, illustrations of morphological features

including detailed drawings of male genitalia, distribution data, and host lists are

provided. The confusion involving C. nipponicus and C. binotatus Grouvelle is

discussed and the differences between them are made evident.