150 



prej)ared (loscriptions are more or less occiipuMl with chni'actei's of wide 

 application, aiul contain l)ut littk> that is sufFuncntly |)reciso and reliable 

 for specific identification. Jiioloiiical notes on \\\o adnlts of Oliio sjiccies 

 have been published by Hine.* 



The Larva. 

 In the collections of the Illinois State Laboratory of Natural History 

 are 215 larvie apj)arontly of this genus, mostly from pastures and corn 



fields. These represent at least four or 

 five species, three of which we have rec- 

 ognized and bred to the adult. 



Common Characters. — Body subcylin- 

 drical, usually about 12-25 mm. long, and 

 2-3 mm. thick, unicolorous, or with pale 

 median line or irregular striping, no clear- 

 cut pattern; finely granulate; setiferous 

 corneous spots all present and very large, 

 occupying nearly the full widths of the 

 lobes bearing them, feebly elevated, rather 

 smooth and shining, usually darker than 

 the ground color; setae pale, dark at base, 

 puncture ringed with blackish. On each 

 side of the third abdominal segment (first 

 leg-bearing), as a typical segment, two of 

 these spots are dorsal, one on the anterior 

 lobe, and one behind it on the posterior 

 lobe; two lateral, both anterior, one above, 

 one below the spiracle, the lower bisetose 

 (not unisetose as in the figure), and two 

 sub ventral, one posterior, the other lower 

 down, exterior to the leg base and trisetose. These spots are unise- 

 tose except as otherwise stated. Often a similar but non-setose 

 accessory spot on the posterior lobe behind the upper or each. of the 

 lateral spots, and a smaller one (the stigmatal) just behind the spiracle, 

 evidently a detached part of the suprastigmatal, with which it is often 

 still connected. Spiracles oval, with a raised blackish rim of uniform 

 thickness, the prothoracic much larger than the rest, which are about 

 equal in size. 



Head sub-alutaceous (Fig. 139, a), basally with some fine impressed 

 reticulations which break up the color pattern more or less into smaller 

 spots. A whitish V just outside the Y-shaped suture. Color pattern, 

 when visible, of dark basal markings, with five anterior extensions, 

 alternately tapering, as follows: A discal triangular extension with 



Fig. 136. Crambus trisectus, larva, 

 dorsal and side views. Aliout four 

 times natural size. 



*"Ohio Crambidje." Journ. Columbus Hort. Soc, Vol. 12, pp. 24-27. 1897. 



