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EIGHTH ANNUAL REPORT 



ITS HISTORY IN MISSOURI IN 1875. 



The most noticeable feature connected with the appearance of the 

 "worm in our own State was its harmlessness, or non-appearance in the 

 western or locust-stricken portion. Most of these counties are large 

 stock-raising counties, and abound in rich prairie and good meadows. 

 Under ordinary circumstances, the worms would have flourished 

 there; but last spring, though I have records of their appearance, the 

 loctists either destroyed them or caused them to starve before they 

 acquired full growth. The following list of counties in which no 

 Army Worms were noticed or in which they were soon killed out, is 

 made up from reports from my correspondents, and very forcibly illus- 

 trates the feature referred to : Andrew, Barton, Benton, Buchanan, 

 Bates, Barry, Caldwell, Clay, Clinton, Cass, Cedar, Daviess, Dade, 

 Dunklin, Grundy, Gentry, Henry, Harrison, Hickory, Holt, Henry, 

 Jackson, Johnson, Jasper, Lafayette, Linn, Marion, McDonald, Macon, 

 Newton, Oregon, Pulaski. Pettis, Putnam, Ray, Sullivan, Scotland, St. 

 Clair, Texas, Taney and Vernon. 



In nearly all of the counties not mentioned I have records of its 

 appearance, and often in such numbers that whole fields and meadows 

 were cut down. 



SEXUAL DIFFERENCES. 



As throwing light on the mode of oviposition the sexual charac- 

 teristics interest us. The sexes at first glance are not easily distin- 

 guished. There are no colorational differences, nor does the abdomen 



of the one sex difi"er materially in 

 size or form from that of the other. 

 Yet a careful examination with an 

 ordinary lens will enable one to 

 separate them with sufficient certain- 

 ty by the smoother antennae (Fig, 22. 

 e) and more pointed abdomen (Fig. 

 22, h) of the female compared to the 

 more hairy or ciliate antennas (Fig. 

 22, d) and blunter abdomen of the 

 male (Fig. 22, a). The antennae of the 

 female will generally be found quite 

 naked toward the base, while those 

 of the male show two rows of stiff 



Genitalia OF MaliTXrmy Worm Moth :— hairS, abOUt half aS loug aS the an- 



A, end ot body, denuded of hairs, showing ' 



the upper clasps ))r()tiuding, and the natural teUUal width. In both SeXeS the tip 

 ))osition of the hidden organs by dolled lines; 



B, the organs extruded. of l^jjg, abdomen is covered with a 



