Ninth Report of the State Batomologist 331 



auce has beeu remarked upon by several writers. Dr. Riley having- 

 received examples of it in Missouri, which were observed hopping 

 about during mild weather in midwinter, has written of it: " It becomes 

 active whenever the weather is mild. It is sometimes found in winter 

 in the early larva stages, but more often in the pupa state."* Dr. 

 Thomas has stated: " The larvae and the pupge and even the perfect 

 insects are occasionally observed during the warm days in winter."f 

 Mr. Weed [loc. cit.) saw them in Peoria county, Illinois, in the month of 

 March, 1886, "hopi^ing around on the grass, although the ground in 

 many parts of the field Avas covered with snow." Mr. Blatchley 

 records them as " frequenting dry open woods and roadsides, where the 

 half -grown young can be seen jumping vigorously about in any warm 

 sunny day in winter." In my Second Report {loc. cit.) record is made 

 of their occurrence in several localities in the State of New York 

 during the winter of 1882, in the month of February, in immense 

 numbers — millions as stated by some observers — jumping about on 

 the surface of the snow with all the life and activity of midsummer. 

 That a temperature of about fifty degrees above zero, Fahr., will 

 usually bring out the insect from its winter quarters, may be inferred 

 from the following data: Of the thermonietrical conditions attendant 

 on the February (1882) occurrences in the State of New York, I have 

 written : " From an average temperature for the several preceding weeks 

 of -\-2l° Fahr., it suddenly changed to a mean temperature (of one 

 week) of 40°, reaching at the highest, 56°." Almost the same condi- 

 tions seem to have attended the appearance at Canaan Four Corners 

 above reported: Thus, the average temperature of the week preceding 

 March 25th, as given in the " Report of the New York Meteorological 

 Bureau " for the month of March, for Albanj^, the nearest reporting 

 station to Canaan Four Corners, was +28^°; that for the week following 

 (25th to 31st), 40°; the highest temperature observed, 57°, on the 26th. 



The Two Forms of the Insect. 

 A description of C. viridifasciata has been given in the Second 

 Report on the Insects ofNevi York. Figure 15 represents the full-grown 

 insect, and its larva in 

 form and size as usually J^^^^o^ 

 seen during the winter. 

 The dimorphic forms un- 

 der which it appears are 



quite marked. They have Fig. is.— The green-striped locust. Chortophaga viridifas- 

 '' ciATA, young and adulc. 



been thought by some 



* Eiijhth Report on the Insects of Missouri. 1S~6, page 149. 

 t Eighth Rej>ort on the Insects of Illinois, 18S0, page 106. 



