Female mosquito collections from stable traps, baited with domestic animals, CO2 and light, set at a rice-farm site and a bayou floodplain site in Brazoria Co., TX during 1973 included specimens representing 5 mosquito genera. Psorophora columbiae was by far the most predominant species in the collections made at both study sites and, therefore, was the species receiving the most attention during the course of this study. The horse-baited stable trap was generally more attractive to female P. columbiae than were traps with other baits. The calf-baited trap was the next most attractive to females of this species and out competed the horse-baited stable trap for P's columbiae females at the rice farm site. Subsequent assessment of blood-engorged mosquito specimens collected from resting habitats at the same sites during 1974 indicated that cattle and to some degree, horses, served as the primary sources of blood meals for the Ps. columbiae specimens. Data on the bloodmeal sources for specimens of other mosquito species collected in this part of the study are included as additional information .