Home / Gossamer-Winged (Lycaenidae) / Miami Blue (Cyclargus thomasi bethunebakeri)

Miami Blue (Cyclargus thomasi bethunebakeri)

Miami Blue Butterfly

The Miami Blue is a metallic blue butterfly, which is the only subspecies of the Cyclargus thomasi and is found in the US. The population of these arthropods has gone endangered, threatened mainly because of critical factors like habitat loss, invasion by non-native flora, measures taken for mosquito control, vegetation management, and of course, the unethical collection of butterflies.

Scientific Classification

  • Family: Lycaenidae
  • Genus: Cyclargus
  • Scientific Name: Cyclargus thomasi bethunebakeri

Description & Identification


Miami Blue Butterfly Caterpillar floridamuseum.ufl.edu

The larvae of these creatures are usually bright green with a black head. They have a slug-like shape with a reddish to a tan dorsal line running through the middle. There are also white lateral lines on both sides of the creature.


Miami Blue Butterfly Pupa entnemdept.ufl.edu

When the caterpillar assumes the form of the chrysalis, its body color changes to brown or black. It takes almost 30 days for the insect to metamorphose into an adult Miami Blue butterfly.

Adult Butterfly

Sexual Dimorphism: In the males of the species, the top portion of the wings has a metallic blue shade, while in the females they are dark gray along with some blue tinge around the base.

Color and Appearance: These are very small size butterflies with both the male and the female having two pairs of wings that are of bright blue color on the dorsal side, and a gray shade at the ventral with four black basal spots. However, they are sexually dimorphic with the male Miami Blues’s hind wings having a narrow black border, while the female has a thick black border, along with and an orange eyespot (mimicry) close to the outer angle of the hind wings.  Both the sexes have a broad, white band on both the wings.

Miami Blue Butterfly Images

Miami Blue Butterfly Photos

Average wingspan: 22 to 28 mm.

Flight pattern: Normal to moderately fast.


Miami Blue Butterfly Eggs floridamuseum.ufl.edu

The females would lay up to 300 eggs, one at a time on the host plant.

Quick Facts

Distribution/Range Detailed and definitive information is not available on the historical range of the Miami blues
Habitat This is a coastal species that lives in the tropical coasts, scrub and pine rocklands
Host plants Primarily three plant species, viz. black bead, balloon vine, and gray nickerbean
Adult diet/food Eats flower nectar and rotting fruits

Did You Know?

  • Research says that up to seventeen species of ants tend to protect the larvae from predators and parasites, but it ultimately gets killed and consumed by them.
  • In its entire life cycle, a single Miami blue is capable in the reproduction of multiple generations every year, between February and November.
  • The female of this species is larger than the male.
  • While once it was common throughout South Florida, these creatures are now limited to only a single population, estimated at 34 adults in 2012.
  • Presently, the University of Florida researchers are engaged in a unique conservation program to help recover the population of this butterfly.

Cyclargus Thomasi Bethunebakeri 

Miami Blue Butterfly Habitat

Miami Blue Butterfly Habitat https://www.butterflyidentification.com/butterfly-facts/butterfly-habitat

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Scientific Classification

  • Family: Lycaenidae
  • Genus: Cyclargus
  • Scientific Name: Cyclargus thomasi bethunebakeri
Published by Avatar on July 9, 2018.
Last Updated: December 19, 2022. ✅ Verified by: Butterfly Team