INSECTS AFFECTINC; I'AKK AND WOODI.AXU TKEES 



595 



almost c\liiKlrlc, of ;i ilelicatc tjrccn color, i)oiiUi-(l al the mort: ckntply 

 buried end, and rounded and of a \cllo\visli tint al tlie oi)|)osite extremit}'. 



Life history. I he life hislor) of tliis insect is incompletely known. 

 The vounj^' wert- found l>y I >r Riley on the loih of May .U which time 

 after |)assin>^ their hrsi ,md thii'd molls, on Ma\' iS ,uid June 5, they trans- 

 formed to |)erfect insects |une 12. I he younj^ are descriiu-d as heiiij^'' 

 without till- hornlike |)rojection of the thorax, ami they appear to lack tht; 

 ability to hop which the adults ]>()sscss, and from which the)' tleri\e the 

 common nanu- ot treelK)i)pers. The time of o\i|)osition is not known, i)Ul it 

 is probahl) not prior to the micklle of August in New ^'ork State, tor on 

 the Sth ol that month 1 )r Liulner ohserx'ed the mature inst-cts abundantly 

 on locust, when none of the ci^^ co\erin_i(s were observcxl. A corre- 

 sponilent ot 1 )r Lintner's records HndinLJ the ei^ir coverim^f in tht! early part 

 of September. We ha\c found them in ( )ct()l)er and the insect undoubt- 

 edly winters in the egs.^. 



Food plants. This species occurs on a numlier of plants ilurin^ the 

 latter part of tlu; summer. It may be found on >^n'ape, reel hoptree and 

 trefoil, the latter its favorite home. It has been recorded as occurrinsj^ on 

 the leaves of the butternut and locust, and has been observetl on wisteria. 



Distribution. This insect has an extensi\c ran^e. ha\ ino- l)een recordetl 

 by \arious writers from Canada, .Massachusetts, New NOrk, New [ersey, 

 Pennsylvania, Maryland, Illinois, Michij^an, Iowa, Missouri and Texas. 



Bibliography 

 1882 Lintner, J. A. Ins. X, Y. ist Rep't, j). 281-88 



Thelia acuminata I'abr. 



This, one of the most i^^rotesejuely shaped of our tree 



h(jppers, is characterized by the enormous development 



of the prothoracic horn, which extends nearly \erticall\ 



with a uniform diameter to a rounded tip '<* inch above 



the large prothorax. The insect is about '^ Inch m nat.T, tniarecd (..riamaii 



Fig. 150 T h c U a ;i c u m i- 

 n a 1 .1 , enlarged (■' 



length, yellowish, densely mottled with brown or dark brown, .specially 



