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Species Accounts & Photos Other Stuff NJ's Species of Concern

  "Georgia" Swift River Cruiser
            Macromia illinoiensis georgina (Selys, 1878)

Species distribution map

Range & Habitat:

The southern race of Illinois River Cruiser, it replaces it in the coastal plain.  Intergrades occur in the overlap zone, especially Hunterdon and Somerset counties.

Patrols along large streams and rivers.

  "Southern" Illinois River Cruiser male

Click on the thumbnails to enlarge additional photos. 

Description:

Really bright, with prominent yellow on abdominal segments 1-8.  For comparison, see "Northern" Illinois River Cruiser.  Caution: intergrades do occur, especially from Hunterdon & Mercer through Monmouth Counties.  Not all can be identified as to type.  The sympatric Allegheny River Cruiser is duller, resembling the northern form.  More study is needed in this complex.

 

Conservation Status:

State: S4 - Apparently secure in New Jersey

Global: G5T5 -  

For a full explanation of the ranks, click here

Flight season:

Early Date: 5/30
Late Date: 9/11

Please scroll down for monthly graph.

 

Flight Season
(hover your mouse over the bar for actual data)
 
Number of Records
12 
0 
1 8 12 2 4
J F M A M J J A S O N D

Months

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Click here for acknowledgments
Date, distribution, and status data courtesy of Allen Barlow, NJOS
© 2006 Jim Bangma, NJOS  Comments or suggestions?  Use the Feedback Form