An associational study of Illinois sand prairie . Hart records five species of .^thraz from the sand re-gions. I have seen species of this genus flying about on baresand or in blowouts, hovering especially over hoof-prints or otherimpressions in the sand. Systoechus vulgaris Loew. August. This species was not taken because of its scarcityearly in the season. LIr. Hart found it quite commonly on is the small bee-like form which is parasitic on grasshopperegg pods. It is quite generally distributed. A very importantmember of the bunch-grass association since it is an efficientcheck
An associational study of Illinois sand prairie . Hart records five species of .^thraz from the sand re-gions. I have seen species of this genus flying about on baresand or in blowouts, hovering especially over hoof-prints or otherimpressions in the sand. Systoechus vulgaris Loew. August. This species was not taken because of its scarcityearly in the season. LIr. Hart found it quite commonly on is the small bee-like form which is parasitic on grasshopperegg pods. It is quite generally distributed. A very importantmember of the bunch-grass association since it is an efficientcheck upon the numbers of the locusts. Proctacanthus brevipennis Vied. July 6. One specimen of this robber-fly was taken at the DevilsHole, eating a beetle Strigoderma arboricola. The arepredaceous, swift7flying forms, dominant among the Diptera. Theyare best developed in the open arid associations of the west andsouthwest, and are comparatively scarce in the black-soil prairieof Illinois. They are characteristic members of the bunch-grass. 146 association. This species has not heen recorded from elsewherein Illinois. Proctacanthus rufus 7/ill. July 8, 12. An extremely large and powerful Asilid, taken eatingTetti^3:idea :lyphica on two occasions, once at the Devilsl^eck. once at the Devils Hole. Though characteristically aplains species it ranges east to Hew Jersey, Hart took P. milhertii Llacq. from August 15 to 20. Thisis a v/estern species also, and is reported to prey upon the RockyIvlountain locust. The Asilidae in the Illinois region no douhtprey upon its close relative, Melanoplus angustipennis. which isthe most abundant hunch-grass insect. The dates for P. hrevipennis range from June 6 to July6; those for P. rufus, July 8-12 fit was seen later than this),and those for P. Llilhertii. August 15-20. A seasonal relationwould seem to be clearly indicated. Syrphus arcuatus Fall^ October 7. The brightly colored syrphid flies feed in the adultstage upon pollen. The l
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