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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Hellgrammite Genus Chauliodes (Fishflies)

Where & when

In 428 records from GBIF, adults of this genus have mostly been collected during June (14%), July (14%), August (14%), May (12%), September (11%), April (9%), March (7%), and February (6%).

In 56 records from GBIF, this genus has been collected at elevations ranging from 3 to 12631 ft, with an average (median) of 778 ft.

Specimens of the Hellgrammite Genus Chauliodes

1 Female Adult

Start a Discussion of Chauliodes


  • Brigham, W.U., A.K. Brigham, and A. Gnilke. 1982. Aquatic Insects and Oligochaetes of North and South Carolina. Midwest Aquatic Entomologist.
  • Stehr, Frederick W. 1998. Immature Insects. Kendall/Hunt Publishing Company.
  • Usinger, R.L. 1956. Aquatic Insects California, with keys to North American Genera and California species. University of California Press.

Hellgrammite Genus Chauliodes (Fishflies)

Species in Chauliodes: Chauliodes rastricornis
1 species (Chauliodes pectinicornis) isn't included.
Common Name
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