June, '19] 



MOSHER: EUROPEAN CORN AND OTHER BORERS 



263 





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22 ^^°^6 



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25 



Fig. 12. 15, Pyralidae, Crambus sp., setal map of prothorax; 16, proleg;'i 17, 

 ocellar arrangement; 18, Diatroea zeacolella, setal map of prothorax; 19, tenth 

 abdominal segment; 20, Diaphania nitidalis, setal map of prothorax; 21, proleg; 22, 

 ocellar arrangement; 23, tenth abdominal segment; 24, Pyratista nvbilalis, setal map 

 of prothorax; 25, proleg; 26, ocellar arrangement. 



CramhinoE. — Many members of this subfamily resemble certain 

 Pyraustinae in many characters. The ocellar arrangement (Fig. 12, 

 no. 26) and that of the setae on the tenth abdominal segment (Fig. 12, 

 no. 19) seem to be very constant characters, as well as those given in 

 the key. Fracker states that some Crambids have the proleg hooks 

 arranged in a broken circle like Pyransta (Fig. 12, no. 25) but of two 

 sizes instead of three. None of these have been found among the 

 species under observation. In this subfamily the genus Crambus has 

 a few species which are borers, and the genus Diatrsea has two, the 

 larger cornstalk-boror, D. zencokUa, and the sugar-cane moth borer 

 D. saccharalis cramboides. Out of the largo genus Crambus only four 

 named species, vulgivagellus, trisectus, leachellus, and hortnelhts, 



