47 



IJcctcs spiiiosiis Say. June 28. 



Fre(iuently found in dry or sandy regions. Associated with spe- 

 cies of ragweed {Ambrosia), on which they breed. The larvae 

 burrow in the stems. The species ranges from New England to 

 New Mexico and Colorado. A prairie species. Taken at the Devil's 

 Hole. 



Mecas pcrgrata Say. June 25, July 5. 



Scarce ; found also in the dry soils of southern Illinois and 

 Indiana. This, like many other insects of dry regions of the South, 

 finds its northern limits in sandy localities. (Cf. Hart, '07:203.) 

 Found in low herbage of open areas. A prairie species. Devil's 

 Hole, in mat of Chrysopsis. 



Tctraopcs fctraoplitlialimis Forst. June 6, 8, 24, July i. 



A common and widely distributed species, found on species of 

 Asclcpias. A prairie form, but rare in the bunch-grass. The milk- 

 weeds begin to bloom in June ; the adult beetles are first seen at this 

 time, continuing abundant throughout the early part of the summer. 



Tetraopes fcinoratus Lee. July 25, 29, August 15, 16, September 8. 

 Closely resembling the preceding species, but with antennae 

 ringed with gray at the joints. It is common in late summer, as 

 indicated by the dates, part of which are from Hart's records, while 

 T. tetraophtlialmus is an early-summer species. This is apparently 

 an example of time adjustment, by means of which closely related 

 species are removed from competition. 



TypopJwnts canclliis atcrriiiuis Oliv. April 4. 



This is the first species, taxonomically, in the list of sand region 

 Chrysouiclidae. This group of beetles is exclusively leaf-eating. 

 They are represented in practically all associations, and reach their 

 maximum development in tropical and subtropical regions. A very 

 common species, often found on foliage of wild grape. Taken from 

 under a log in bunch-grass bordering a cultivated field. 



Clirysoclius auratiis Fab. June 25, July 5, 12, 25. 



Common and widely distributed. It lives upon the foliage of 

 Apocynum and Asclcpias. Quite common in the bunch-grass. Taken 

 on Asclcpias syriaca, Asclcpias phytolaccoidcs, and a species of 

 Apocynnin. In an abandoned field near the Devil's Hole, which was 

 reverting to bunch-grass, the Apocyniiui was verv' abundant over a 

 large area, and four or five Clirysoclius beetles were seen on each 

 plant. 



