Zucchini 

In the Pacific Northwest and in British Columbia in particular, chironomids get big. Chironomids so large they are locally known as bombers. This version of the Zucchini, a popular BC fly is intended to suggest emerging bomber pupa. Large bomber patterns such as this version also make an excellent, 'stand out in a crowd' pattern when trout are targeting smaller pupa.
Material Sources:
Daiichi Hooks: www.canadianllama.com
Brass Beads: www.canadaianllama.com