Our l.iviiii; Rfsoiiicf.y — Imcitchnitc.s 



JS7 



Illinois. As yel. no cause for lliis reduced distri- 

 bution has been pioposed. Tiiis is tiie most spec- 

 tacular example we have discovered, but similar 

 distribution patterns have been noted in other 

 species, particularly within the genus 

 Acroneiiria. Our recent collections reveal that 

 generalist species — those tolerant of a variety of 

 environmental perturbations — appaiently are 

 becoming the dominant species in Illinois. 

 Allocapnici vivlpani, Tueniopteryx hiirksi. and 

 Isopcrla hilmeata are examples of this trend: all 

 are widespread throughout Illinois in many eco- 

 logical habitats. 



References 



Prison. T.H. 1929. F;ill and winter stoncnics. or Plecoptera. 

 of Illinois. Bull, of the Illinois Natural Historv Survey 

 l8:34.'i-409. 



Prison. T.H. 19.^5. The stonetlies. or Plecoptera, of Illinois. 

 Bull, of the Illinois Natural History Survey 20:281-471. 



Prison, T.H. 19.17. Studies of Nearctic insecLs. II. 

 Descriptions of Plecoptera. with special reference to the 

 Illinois species. Bull, of the Illinois Natural History 

 Survey 21:78-99. 



Prison. T.H, 1942. Studies of North .American Plccoplera. 

 with special reference to the fauna of Illinois. Bull, of the 

 Illinois Natural Histoi7 Survey 22:235-355. 



Ricker, W.E.. and H.H. Ross, 1968. North American species 

 of Taeniopteiyx (Plecoptera: Insecta). Journal of the 

 Pisheries Research Board Canada 25:1423-1439. 



Ricker, W.E.. and H.H. Ross. 1969. The genus Zeali-iutra 

 and its position in the family Leuctridae (Plecoptera, 

 Insecta). Canadian Journal of Zoology 47:1 113-1 127. 



Ross, H.H.. and W.E. Ricker 1971. The'classification, evo- 

 lution, and dispersal of the winter stonefly genus 

 Allocapniii. Universitv of Illinois Bioloay Monographs 

 45:1-162. 



Wctib. D.W,. and M.A. Harris. 1993. Survey of 21 rare 

 species of stonetlies (Plecoptera) in Illinois. Illinois 

 Natural History Survey. Center for Biodiversity Tech. 

 Rep. I993(3):l-I4. 



For further information: 



Donald W. Webh 



Illinois Natural History Survey 



Center for Biodiversity 



607 East Peabody Dr. 



Champaign, IL 61820 



