Two field trials for commercially available and experimental mosquito traps variously baitedwith light, carbon dioxide, octenol, or combinations of these were evaluated in a malarious area at Paekyeon-Ri near Tongil-Chon (village) and Camp Greaves, Paju County, Kyonggi Province, Republic of Korea. The hostseekingactivity for common mosquito species was determined using hourly aspirator collections from a humanandpropane lantern-baited Shannon trap. The total number of mosquitoes and number of each species capturedduring the test were compared using 8 x 8 and 5 X 5 Latin square designs based on trap location. Significantdifferences were observed fbr the total number of mosquitoes collected in the 8 X 8 test, such that counterflowgeometry (CFG) with CO, > CFG with CO, and octenol > Shannon trap > Mosquito Magnet@ with octenol> American Biophysics Corporation (ABC) light trap with light, CO, (500 ml/min), and octenol > ABC lighttrap with light and dry ice > ABC light ffap with light and CO, > ABC light trap with light only. A concurrent5 X 5 test found significant differences in trap catch, where Mosquito Magnet with octenol > New Jersey lighttrap > EPAR@ Mosquito Killer with CO, > ABC light trap with light and dry ice ) Centers for Disease Control(CDC) light trap (manufactured by John W Hock) with light and octenol. Significant differences in trap catchwere noted for several species including: Aedes vexans, Anopheles sinensis, An. yatsushiroensis, An, Iesteri,Culex pipiens, and Cx. orientalis. Traps baited with octenol captured significantly fewer Cx. pipiens than thosenot baited with octenol. Likewise, no Cx. orientalls were captured in octenol-baited traps. Host-seeking activityshowed a similar bimodal pattern for all species captured. Results from these field trap evaluations can significantlyenhance surveillance efforts. Significantly greater numbers of mosquitoes were captured with mosquitotraps using counterflow technology (e.g., Mosquito Magnet and CFG traps) when compared to standard lightand carbon dioxide-baited traps. Additionally, field evaluations demonstrate that various traps can be utilizedfor isolation and detection of arboviruses and other pathogens.