93 



almost entirely within the prothorax, so that at most the man- 

 dibles, tip of mentum and palpi project beyond the prothorax. 

 When picked up, they give quite a cold sensation to the touch. 

 Sometimes they emit a blackish fluid from the mouth, in the 

 manner of locusts. Erroneously, according to the claims of 

 priority, although the error is more appropriate than the truth, 

 they are commonly called " glow-worms." By the suggestion 

 and indications of Mr. E. P. Austin, I conjecture that they 

 are the larvoe of Asaphes memnonius. B. Piekman Mann. 



The Note of the Katydid. 



Since I began to study the character of the notes produced 

 by different species of Orthoptera, it has been my fortune to 

 hear that of the true Katydid QCyrtophyllus concavus) but once. 

 This insect lives in tree tops, one or two only in a tree, in little 

 colonies scattered here and there over most of the United States 

 east of the Rocky Mts. One such colony I encountered in the 

 heart of the city of Springfield, Mass., and spent an evening en- 

 deavoring to reduce the notes to scale. The insects which I 

 observed were from fifteen to twenty rods distant, perched in 

 the tops of maple, cherry and elm trees, not far above my 

 window. 



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BED i - a>» &' -0 S'—i O O 0.' thi 1 



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They ordinarily call " Katy, " or say " she did, " rather than 

 " Katy did r ' ; that is, they rasp their fore wings twice, more 

 frequently than thrice ; these two notes are of equal (and 

 extraordinary) emphasis, the latter about one quarter longer 

 than the former ; or, if three notes are given, the first and sec- 

 ond are alike and a little shorter than the last; the notes are 

 repeated at the rate of two hundred per minute ; and while 

 the interval between two series of notes varies to a certain 

 degree, it is seldom greater than two and one-third seconds, or 

 less than a second and a quarter ; usually it is between one and 

 seven-eighths and two seconds. The accompanying cut, in which 

 each bar represents a second of time, attempts to reduce this to 

 a scale. 



