72 REPORT OF THE STATE ENTOMOLOGIST I92I 



below. Second and third thoracic segments with anterior, narrowly 

 linear submedian tubercles and broader submedian posterior tuber- 

 cles, the latter somewhat expanded laterally. Near the middle of the 

 segment and just below the sublateral white line there is an irregu- 

 larly oval large tubercle with a roughly triangular one a little pos- 

 terior and ventral and a smaller, slightly anterior and ventral. 

 There is a circular, moderately large tubercle on the base of the 

 true legs. Abdominal segments with the anterior, submedian 

 tubercles relatively much larger, irregular and extending nearly 

 across the brownish or reddish submedian stripes. The posterior 

 submedian tubercles a little more lateral and much smaller than the 

 anterior pair. Around the spiracle there is a dorsal, a posterior and 

 a ventral tubercle, all rather large and irregular and a much smaller 

 anterior tubercle, all but the ventral being more or less fused on 

 the second and third abdominal segments. The ninth abdominal 

 segment with an irregular, somewhat illy defined chitinous area, 

 somewhat emarginate mesially, covering the posterior two-thirds 

 of the dorsum of the segment and joined by a slender extension to 

 a broadly oval, lateral tubercle. Suranal plate covering most of the 

 segment and in well-marked specimens with the lateral angles more 

 or less fuscous. True legs mostly dark brown or black, prolegs 

 unicolorous except that the row of hooks is more or less fuscous. 



This older stage of the stalk borer was found repeatedly during 

 July in corn, working in a manner very suggestive of European 

 corn borer though the burrow was usually larger and the borer 

 itself markedly distinct. 



The stalk borer occurs in a number of thick-stalked plants, 

 specially potatoes, tomatoes and dahlias. It is a local pest and its 

 operations are mostly confined to the outer rows in cultivated fields 

 or to those weedy the preceding season. Clean and thorough culti- 

 vation is a most effective control measure. The cutting and crush- 

 ing or burning of wilting tips is also of service. 



Lined corn borer (Hadena fractilinea Grote) . The 

 yellowish, dull reddish-brown striped, rather slender caterpillars 

 about I inch long, may work in early June in the heart of young 

 corn, tunnelling the stalks and giving evidence of their presence 

 by the irregular holes near the base of the leaves and the wilting of 

 the earlier injured plants. The work of this pest is very similar to 

 that of young stalk borers, though the striking blotchy markings 

 of the latter make it very easy to distinguish between the two. The 

 caterpillar of the lined stalk borer presents a superficial resemblance, 

 size and all, to the recently introduced European corn borer though 

 it can be easily distinguished therefrom by the practical absence of 

 brown spots, really chitinized or horny tubercles, and the fact that 

 usually it works only in young corn, generally in early June, 



