108 



This Katydid occurs in abundance in New England and the Middle At- 

 lantic states, and in the past has been confounded by many writers both 

 with S. curvicauda and with S. furcata. In size, general appearance and 

 structure of anal spines of male it is very similar to furcata, but may 

 readily be known by its shorter posterior femora, and by its narrower 

 wing covers. 



Measurements: Male— Length of body, H mm., of tegmina, 2G mm.; 

 of posterior femora, 19 mm.; of pronotum, 4 mm. Width of tegmina, 5 

 mm. Female— Length of body, 19 mm.; of tegmina, 25 mm.; of ovipos- 

 itor, 5.5 mm. 



The male of angustifolia is our smallest member of the genus. In Indi- 

 ana it is known only from Fulton county, several specimens of both sexes 

 having been taken on October 7th, from the borders of a peat bog in a 

 tamarack swamp, near Kewanna. This, as far as known, is its first record 

 west of Xew Jersey. It will probably be found to occur only about the 

 bogs and swamps of the northern half of the State. 



Mr. S. H. Seudder, who has studied carefully the songs of many species 

 of Orthoptera and has even set a number of them, including that of angus- 

 tifolia, to music, has given a pleasing account of its song® from which I give 

 the following extract: "It is more noisy by night than by day; and 

 the songs differ considerably at these two times. The day song is given 

 only during sunshine, the other by night and in cloudy weather. I first 

 noticed this while watching one of the little creatures close beside me ; as 

 a cloud passed over the sun he suddenly changed his note to one with 

 which I was already familiar, but without knowing to what insect it be- 

 longed. At the same time all the individuals around me, whose similar 

 day song I had heard, began to respond with the night cry ; the cloud 

 passed away, and the original note was resumed on all sides. Judging 

 that they preferred the night eong to that of the day, from their increased 

 stridulation during the former period, I imitated the night song during 

 sunshine, and obtained an immediate response in the same language. The 

 experiment proved that the insects could hear as well as sing. 

 The note by day is 6 : r w i and lasts for one-third of a second. The night 

 song consists of a repetition, ordinarily eight times, of a note which sounds 

 like t c h "'. It is repeated at the rate of five times in three quarters of a 

 second, making each note half the length of the day note." 



"Distribution of Insects in Xew Hampshire, L87 



