Wisconsin Odonata Survey

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Macromia illinoiensis illinoiensis  Walsh, 1862
Swift River Cruiser (Illinois River Cruiser ssp.)


Macromiidae, Cruiser Family

Status-Global/State:

Global: G5     Wisconsin: S4    

Distinguishing Characteristics:

River cruisers are generally larger and more metallic than the stream cruiser. This large dark brown dragonfly has a single lateral yellow stripe on each side of the thorax. The length of the body varies from 2.6 to 3.0 inches. The abdomen has yellow spots along its length. The end of the male's abdomen is slightly clubbed. Eyes are bright green. It is very methodical in its flight, foraging at long distances, including upland areas.

Description of Habitat/Range:

It is usually found at fast streams, large rivers and lakes with moderate wave action. Like the stream cruiser, the larvae may travel more than 40 to 50 feet before emerging. It is commonly found throughout eastern United States and southeastern Canada, and is fairly common in northern Wisconsin.

Flight Season:

Early June to early September in Wisconsin.


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
13%
(84)
72%
(482)
13%
(87)
2%
(12)
<1%
(2)
<1%
(1)
Shading illustrates monthly percentages of the total flight season records for the species. Each flight season record is a unique date/location/observer combination where one or more adult or an exuvia was recorded (excludes nymphs). The actual number of flight season records for each month is shown in parentheses.

Flight seasons begin earlier in the southern part of the state, often by a week or more. Also, flight charts may not be accurate for rare species because of few data available.
View user-submitted photos

(Click on photos to enlarge)
Photo of Male Illinois river cruiser
Male Illinois river cruiser. © Dan Jackson

Male Illinois river cruiser
Photo of Male Illinois river cruiser
Male Illinois river cruiser. © Andy Paulios

Male Illinois river cruiser
Photo of Immature male Illinois river cruiser
Immature male Illinois river cruiser. © Dan Jackson

Immature male Illinois river cruiser
Photo of Female Illinois river cruiser
Female Illinois river cruiser. © Dan Jackson

Female Illinois river cruiser
Photo of Male and female Illinois river cruiser
Male and female Illinois river cruiser. © Dennis Paulson

Male and female Illinois river cruiser



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