Insect of the Week: Laetodon

Adapted from page 38-39 of Field Guide to the Flower Flies of Northeastern North America

Laetodon species are small metallic ant flies (Microdontinae) with a posterior appendix on wing vein R4+5. This genus used to be included within Microdon and was described in 2013 by Menno Reemer. The genus Laetodon includes five species, four of them Nearctic and one Neotropical. Only one species occurs within the area of the field guide. Larvae are presumed to be predators in ant nests but have not been described. 

More specifically, the Laetodon laetus is a small metallic ant fly ranging from 6.0-9.7mm in size. These are small, strongly metallic flies that are green, blue, or purple. The tibiae are orange and the flagellum has a short sensory pit on the outside edge. The eye is sparsely pilose. These insects are rare and local, with a flight time ranging from late March (in Florida) to early October (in Arizona), or late May to late September within the area of the field guide. In Maryland, the records are all from mid-to-late July. Larvae are unknown.

Field Guide to the Flower Flies of Northeastern North America
By Jeffrey H. Skevington, Michelle M. Locke, Andrew D. Young, Kevin Moran, William J. Crins, and Stephen A. Marshall

This is the first comprehensive field guide to the flower flies (also known as hover flies) of northeastern North America. Flower flies are, along with bees, our most important pollinators. Found in a varied range of habitats, from backyard gardens to aquatic ecosystems, these flies are often overlooked because many of their species mimic bees or wasps. Despite this, many species are distinctive and even subtly differentiated species can be accurately identified. This handy and informative guide teaches you how.

With more than 3,000 color photographs and 400 maps, this guide covers all 416 species of flower flies that occur north of Tennessee and east of the Dakotas, including the high Arctic and Greenland. Each species account provides information on size, identification, abundance, and flight time, along with notes on behavior, classification, hybridization, habitats, larvae, and more.

Summarizing the current scientific understanding of our flower fly fauna, this is an indispensable resource for anyone, amateur naturalist or scientist, interested in discovering the beauty of these insect.