1 68 TETTJGID.E OF NORTH AMERICA 



HATCHING OF TETTIX ORNATUS. 



At eleven minutes of three p. m. I discovered in jar No. i a new brood 

 issuing from the ground. Three have come out, while following close in the 

 trail come two together, pushing the last one ahead. A few moments after 

 the first came out it jumped two inches away. There was one that came out 

 previous to my first observation. I saw a pale specimen alone, one inch 

 away, and suppose it is one of the brood, six in all. There is a probability 

 that some came out before this. There is a determination to get away from 

 the egg site as soon as the locust emerges, each walking toward the 

 source of light in the jar. Instantly after the amnion is shed the little 

 Tettigids stand on their feet, getting their equilibrium. Sometimes the 

 insect by forcible convulsive motion of the body succeeds in breaking 

 the egg shell and comes up out of the ground with the amnion still intact; 

 then by an expanding movement of the legs the amnion tears open and 

 the young set free at once find a footing on the ground. In another 

 instant it may be walking quite freely away or even jump, if disturbed, a 

 distance of one or two inches. June 14, 1898. 



TETTIX ORNATUS HATCHING IN JUNE. 



A brood hatched in my absence to-day in jar I. I saw about haIf-a-doze:i 

 specimens, still pale, on my return. June 15, 1898. 



ECDYSIS OF TETTIX ORNATUS — SECOND EXUVIATION — 

 DIVERGENCE OF COLORING IN THE SAME BROOD. 



There is evidence in my vivarium jars that the brood hatching May 

 31 are shedding their skins for the second time. One under my eyes has 

 climbed upon a grass blade an inch from the ground and is pale. Near it, 

 an eighth of an inch away, clinging to the grass, is the cast-off cuticle. 

 Three others evince ecdysis having taken place to-day. The first shedding 

 occurred on the tenth and eleventh days of the present month (eight and 

 nine days ago); June 19, 1898. The following day I found new evidence of 

 exuviation by the discovery of a specimen emerging from the cuticle. It 

 was pale, as usual, though some slight pigmentation was observable. Another 

 specimen of reddish color cast its skin. In the seven specimens left of this 

 brood hatched May 31 there is considerable divergence in the variety of 

 ornamentation, showing this peculiarity extends to individuals of the same 

 brood. 



BROOD OF TETTIX ORNATUS HATCHED, CONSISTING OF 

 TWELVE SPECIMENS — TARDINESS IN HATCHING OF 

 TWO SPECIMENS. 



I found a brood coming out of the ground at i o'clock p. ni., which 

 consisted then of ten specimens. They came out as usual, one after 

 another, but at 2:30 p. m. another tardy individual appeared, making eleven 

 up to this time. Again at 4:25 p. m. another hatched, making twelve in 

 all. June 20, 1898. 



