I-J 



and I've lia\(' Ix'cii injured 1)\' nihjiviuidhis, t()l)acc() 1)\' lutcohUiis {cdliqi 

 H(isilliis), and ci'aiilHMTN' \)\ horl iicllus, a si)(M'i(>s not \('t I'cpoiicd I'l'oni 

 coi'n. 



Tlicrc ai'c ahoul sixty species of llie iicnns ('nnnluis in the I nit(Ml 

 Stales. So far as known tliey ai'e of \-ery siinilai' liahil, and it is (luite 

 likely that any of them lixiiii;' habitually on ,<;fass will injure corn if this 

 is (^\pos(>d to theii' attack. The speci(>s notably injurious to this crop 

 will conse(|uently depend, in all prohahility, upon those which happen 

 to pr(>dominate in the i;i-ass at the time the tieUl is plowed, and as these 

 predoininatiiiii; si)e('ies dilTer from year to year, lh<^ list above fi'lven is 

 not to be reii,ar(led as final. 



Distn'htilion. — The recorded distribntion of the four si)ccies actually 

 bred from corn (>xtends from tlu^ Atlaidic to the Pacific, and from ^hiine, 

 Canada, and ( "alil'ornia, to Texas, Louisiana, and I'dorida. 



.Moi-(> specilically. the known distribution of the species with which 

 we are luM'e especially concerned is substantially as follows: 



('. inuliihilis, from ( )idario, Massachusetts, Coiuiecticul, ami Pakota. 

 to New ^'ork, ()hio, Illinois, Kentucky, Moi'lda, bcuiisiana, Texas, 

 Nebraska, and California. 



C. Iriscclus, fi-om Canada. .Maine, Michiji'an, .Minnesota, Dakota, 

 Wyomin<>;, aiul \'ancou\-er. to New Jersey and New Mexico. 



(\ hifcolrlhis.* from .Maine, New York, Ontario, Mimiesota, and 

 Colorado, to North Carolina, Illinois, Texas. Arizona, and California. 



('. riil(iir(i(/('lliis. from .Maine. Massachusetts, New York. Canatla, 

 ^^'isconsin, and N'ancoux'er. to North Carolina. Missouri. Colorado. Utah, 

 and California. 



/.//( Ilislori/. Th(> biology of the sj)ecies has not been sufficiently 

 studi(Ml to ,<;'i\(> us a comparative knowdedge of their life histories, al- 

 though exist iiiii' exidence indicates a difference in the species with respect 

 to the number of annual li'eiKM'ations, which xaries fi'om or.c^ to three 

 in a season in \\\v sanu> locality. It is possible. liow(>\-er. that ampler 

 data would i-emo\(> this impi'ession. 



So far as known, all pass the winter in our latitude in the caterpillar 

 stage. appar(Mitl\- not full lii-own. in (\irly fall they close the mouth 

 and thicken the wall of theii' c\lindi-ical silk-lined lu^sts before goinu- 

 iido hib(M-nation. In tlu^ sprint;- th(\\- come forth, complete their growth, 

 pupate near the surface, and latiM' (Muerge as adults. " The eggs," sa\s 

 Dr. I'elt. "are usually, if not always, allowed to fall at random in tlit> 

 grass. They hatch in from ten to twenty days." l\g,gs of various 

 species ha\-e bi>en ol)taine(l by us fi-om ,hine \) {Iriscdtis) to .Inly '22 



*.\ tlioroiiKli stU(l,\ of :uitliciritativfl\- iKiiiicd ailults, (if I ho larvM'. and of I he lilcratme of llii" 

 tlirce so-called .species ((i/Zg/woicWK.?, 2(r7//rj, and liilcoldlus, aiupl.v coiitinn previous conclusions of 

 this office, that they represent only variations of a single jiolyniorpliic species, liileoldhis. The 

 <lotails will be jriven in a later portion of this report dealiiis with Ilic d.ila of less economic 

 importance relatiiiK to corn insects. 



