171 



Jassid/E 

 Platymctopius frontalis Van D. 



This leaf-hopper was taken in sweepings in the cone-flower col- 

 ony (Sta. I, e) Aug. 12 (No. 40). 



APHIDID/E 



Microparsus variabilis Patch. 



This plant-louse infests the leaves of the Canadian tick-trefoil, 

 Desmodium canadcnsc, and causes the leaves to curl. Quite a colony 

 of these plants found infested (near Sta. I, / ) Aug. 24, were stunted 

 and deformed by these plant-lice (No. 160). Consult Patch (Ent. 

 News, Vol. 20, pp. 337-341. 1909) for a description of the insect 

 and a plate showing the injury which it causes; also Williams (Univ. 

 Studies, Univ. Neb., Vol. 10, p. 76, 1910) and Davis (ibid., Vol. 11, 

 p. 28. 1912). 



Aphis asclepiadis Fitch. Milkweed Plant-louse. 



Plant-lice of this species were abundant upon the younger ter- 

 minal leaves of the common milkweed, Asclepias syriaca, along the 

 railway track north of Charleston (Sta. I) Aug. 12 (Nos. 28, 29, 

 and 154). Associated with them were workers of the ants Formica 

 fusca Linn. var. subscricca Say (Nos. 28, 29, and 154) and For- 

 mica fusca Linn. (No. 28). On a milkweed plant which lacked the 

 plant-lice were found associated another ant, Formica pallide-fulva 

 Latr., subsp. schaufussi Mayr, var. incerta Emery, and the metallic- 

 colored fly P silo pus sip ho Say. 



At Urbana, 111., a very abundant plant-louse on wild lettuce, 

 Lactuca canadensis, is Macrosiphum rudbeckier Fitch (det. by J. J. 

 Davis). The upper, tender branches of these plants are in the fall 

 covered with vast numbers of these lice, both wingless and winged. 

 That this species feeds upon a number of other prairie plants is a 

 point of much interest because of their distinctly prairie character. 

 It is reported from Vernonia, Solidago, Bidcns, Ambrosia, Cirsium, 

 Silphium, and Cacalia (Thomas, Eighth Rep. State Ent. 111., p. 190. 

 1879). 



Pentatomid.e 



Euschistus variolarius Beauv. (PI. XLI, fig. 3.) 



This common plant-sucking bug was taken on flowers of the 

 swamp milkweed, Asclepias incarnata (Sta. I, d), Aug. 9 (No. 12) ; 

 from the blue-stem Andropogon colony (Sta. I, g), where a large 

 robber-flv, PromacJius vcrtcbratus, was taken astride a grass stem 

 with one of these bugs in its grasp Aug. 12 (No. 39) ; at Station 



