30 John Todd Zimmer 



at Halsey, Nebraska. On August 25, 191 1, when I was col- 

 lecting at that locality, Mr. A. G. Vestal, who was with me, called 

 my attention to a bug which he had picked up. I found it to be 

 an individual of the present species and search revealed the pres- 

 ence of such an abundance of others that I was able to secure a 

 hundred or more in a comparatively short time. The habitat of 

 the species here was a sandy stretch of ground, occupied by a 

 prairie-dog town and covered with typical Nebraska sandhill vege- 

 tation, including among the plants Euphorbia geyeri. This plant, 

 growing flat on the ground and spreading out rather broadly, 

 sheltered the insects, which were found, sometimes a dozen or 

 more at a time, under the prostrate stems and leaves. The same 

 plant grew higher up on the hills and in the blow-outs, and I 

 found the bug once in such a location on September 2, when I 

 collected a dozen or more. On September 15, at Crawford, Ne- 

 braska, I collected another specimen in a canyon of the pine ridge 

 near the canyon's mouth, although I did not take it from the 

 Euphorbia, and at Halsey, again, on the 23d of the same month I 

 found it still abundant, althoug*h after a heavy frost. 



The individuals secured are in several stages of development 

 and show, as well, various degrees of oxidation; some are of a 

 uniform shade of pale fulvous, except for the white markings, 

 and others are distinctly blackish in places as described by Mr. 

 VanDuzee in Trans. Am. Ent. Soc, XXX, p. 10. The venter is 

 quite reddish in the very pale specimens but deepens almost to 

 black in the more fully matured ones, especially on the pectus. 

 The females, perhaps, average a little larger and darker than the 

 males, and in both sexes the entire margins behind the head are 

 finely ciliated as in T. ciliatus. 



EXPLANATION OF BIBLIOGRAPHICAL REFERENCES 



Am. Ent. — American Entomology (Thomas Say). Philadelphia. 



1817-28. 

 Am. Entom. — American Entomologist. 

 Amoen. Acad. — Amoenitates Academicae (Carolus Linnaeus). 



Stockholm. 1749-69. 



248 



