Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

2018 BugGuide Gathering in Virginia July 27-29: Registration and Discussion

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

Fat body - Culex pipiens - female

Fat body - Culex pipiens - Female
Victoria, Vancouver Island, British Columbia, Canada
December 26, 2005
Here is a female Culex pipiens that I just found in my mother's house. It has the hypertrophied fat body typical of overwintering females. Almost looks like it is gravid, but dissection would reveal the ovaries in Christopher's stage II only. They are inseminated, and when they emerge from hibernacula, they seek a bloodmeal to mature their eggs. In colder climates, Anopheles, Culiseta and Culex all undergo this "reproductive diapause". Most Aedes s.l., and Psorophora overwinter as eggs, and Coquilletidia and Wyeomyia smithii overwinter as larvae.