ENTOMOLOGIST AND BOTANIST. 



ruseinblcs the Ariny-woriii in appearance, but 

 lias many habits in common. 



Lot tlic two not be conlbuniled, however. Tlie 

 trne Army-worm never appears in tlie fall of the 

 year, but always about the time wlien wheat is 

 i^etting' beyond (he milk state; and it "-enerally 

 disappears, in the latitildc of St. Louis, l)y the 

 lirst of June. It < ontines its rus ar i 



attacks entirely to thf^ gia-^-es 

 and cereals, wlicie.i-. tin 

 species undei considc i ition 

 isamuchmorcgenei illicih i 

 devouring willi equal leli'-li 

 most succulent plants, <-u( h 

 as wheat, oal.s coin,I)aile\ 

 ^'rasses, purslane, turnip*-, 

 and, as Mr. J M .loidaii ol 

 SI. Louis infbims iis, even 

 spruces. JSforeover, when 

 critically examined, the two 

 worms show many character- 

 istic diffcninccs, as will be, 

 seen by comparingFigure207, iiuiiytH'w and pi.ik. 

 which represents the true Army-worm, with 

 Figyie 2()fi, wliicli represents al a the Fall Army- 

 worm natural size, at h its head magnified, at c 

 a magnified dorsal view of one of the joints, and 

 al d a magnified side view of same.* 



With us the Fall Army-worm has done more 

 injury to corn thau to anything else. It not only 

 greedily d vours the leaves and stem, but bores 

 large hoi through the e .rs, bui'rowing in 

 them in an directioiif ..,. late corn it i. fre- 

 quently fi- nd in the " ear with the Corn- 

 worm, alL ' )tton B( ' " " oi {llcliothis armi- 

 ;/era). In. ,. , it is ai „.,i,,.:: confounded with 

 this last ini..i-. as witl '<* •, i'ue Army-worm, 

 and in reality aore near,."'i-esenibles it. The 

 Jioll-woim is, however, rougher, generally 

 jialcr, striped differently (see Figs. 150 and 1.01 

 of Vol. I), and always readily distinguished by 

 having a lar:.'.''' ' 'How or reddish 'lo-i.^ 



wlii-' • ' 



as our forms are being made up, we have (Sept. 

 20th) bred the parent moth of the Fall Army- 

 worm ; and, as we anticipated, it proves to be 

 the very same undescribed species of Prodenia 

 which we bred from Mr. Daggy's Worms. We 

 shall describe it in our next issue under the 

 more appropriate specific name of autumncdis. 



Oil flie (iroiip Eiirytdinides of the llymoiiopternns 

 Paiiiilv Clialcitlichu : 



(IN THE TllEOKY OF SPICCIK3, 

 N OF .VNTICASTKK, A NKW ANH VI 

 \LOlI.S HKNDS OF CllAl.rilMII.K. 



[C&ntinucd from page HOI.] 



[rig. 3 ] 



GENUS ISOSOMA. ^J^^ 

 To this genus, as limited above , must be referred the noto- 

 rious Joint-worm Fly, which I have clearly aacertiviucrt to 

 be the veritable a thor ol" the galls upon the stems of wheat, 

 bark" md ry. jure of which galls will be found above 



(Fig. a). I HaiTis and Kitch down to Glover and 



Pack.i , all au^, s have hitherto referred this insect to the 

 geniLs Eury/07»a,"irom which, however, it differs es,9entiully. 

 If it loiild with any propriety be refcn-ed to that .ucnu-s, we 

 should then have a case of the same genus including both 

 parasitic and plant-feeding species; and I do not oelicve Mint 

 any such violation of the great law of the unity of iiaiut.s 

 can be met with anywhere in nature. As long ago as 18(i7 , I 

 publi.shed in the Canada Farmer for that year (pp. 2ti7-8) a 

 ii^hort article, acknowledging mv error (as Ln\ en t,n the world 

 il^t)lv Practical Entomologist I, ]i\' ii i: m.l ;t ; i n, .1 mih mil.': 



'usions at which Hail i.i;i; ^n, .;irs 



'v.i)iimcly, thii! .1 ).: ■,', . , ' 111.- 



