Casbia celidosema 
Casbia scardamiata 
Cascade Timberline Grasshopper 
Cascera bella 
Case-bearing clothes moth 
Case-bearing leaf beetle 
Casey's lady beetle 
Cassagnaudiella pruinosa 
Cassida circumdata 
Cassida deflorata 
Cassida stigmatica 
Cassida vibex 
Cassin's 17-Year Cicada 
Cassius Blue 
Cassolaia maura 
Cassyma chrotadelpha 
Castalia Green Mantle 
Castiarina acuticeps 
Castiarina adelaidae 
Castiarina aeraticollis 
Castiarina andersoni 
Castiarina argillacea 
Castiarina atricollis 
Castiarina aurantiaca