Librarian Files

False Cinch Bugs

"False Cinch bugs" are little insects that sometimes will appear in swarms in Tucson. After a wet, warm winter the juvenile "false cinch bugs" can appear.  The swarms are usually described as a weird brown mass that keeps changing shape and moving. The "false cinch bugs" will migrate in huge clouds and settle in shady areas.  These insect swarms are not harmful. If you step on these insects they will emit a stinkbug aroma. These insects do not bite or spread disease.  The masses of these insects will be around for two to three weeks.   You do not need to spray these insects.  They will not harm humans, pets or yard plants.  To control these insects:  Close your doors and windows.  Vacuum these insects if they get inside your house.  Spray these insects with a hose outside.

For an image of these bugs go to


“Clouds of odd bugs invade.” Arizona Daily Star, May 10, 2005 Page B1.

Werner, Floyd G.  Insects of the Southwest: how to identify helpful, harmful, and venomous insects. Tucson, AZ: Fisher Books. c1994. Page 108

Article tagged with: false cinch bugs, bug, insect, tucson

Last Update: 6-19-2014 1:49pm

<< Back
Pima County Website