HANCOCK 169 



THE NUMBER OF EGGS HATCHING IN TETTIX ORNATUS; 

 THIRTEEN AND TWELVE INDIVIDUALS IN EACH BROOD. 



The following observations on the hatching of Tettix were made June 

 22, 1898: First brood of Tettix, consisting of thirteen specimens, hatched at 

 12:50 p. m.; second brood at 2:20 p. m., twelve individuals; third brood at 

 4:-to p. m., thirteen, making a total of thirty-eight specimens for three 

 females. June 22, i8g8. 



EGGS OF TETTIX ORNATUS MORE SWOLLEN IN THE 

 ADVANCED STAGE OF INCUBATION. 



The eggs of Tettix ornatus which I have examined at the seventeenth 

 day of incubation are quite swollen at either end. The tail-like anterior 

 pole at the cephalic extremity appears relatively long and slender. The 

 surface of the egg is rough. On extracting one of the embryos it was found 

 almost ready to hatch. June 23, i8g8. 



FIFTEEN IN A BROOD OF TETTIX ORNATUS. 



Fifteen specimens of Tettix came out of the ground at 12:50 p. m. 

 June 23, 1898. 



MALES WEAKER THAN THE FEMALES— DYING IN VIVARIUM 



IN JULY. 



Anotlier dead male in the jar this morning shows how much less they 

 can stand than the females. A number of males have died and this is the 

 last one in the jar. Up to this time the specimens (females) have been quite 

 thrifty, though it is a matter of difficulty to keep licheus growing in suffi- 

 cient abundance to keep pace with their devouring habits. July 3, 1898. 



THIRD ECDYSIS OF TETTIX ORNATUS; GROWTH DEPENDS 

 ON FOOD SUPPLY. 



On July 2 three cuticles, and the following day two, making five out 

 of the seven specimens of a brood under observation, casting the third 

 exuvia. From the evidence at hand the shedding of the skin depends upon 

 the growth of the individual, and secondly upon the food supply. July 3, 

 1898. 



TETTIX ORNATUS LAYS EGGS JUNE 29 AND AGAIN JULY 7. 



A long-wing form (Tettix ornatus) oviposited to-day. This is the 

 identical specimen that laid eggs on June 29, this being the second batch of 

 eggs, with a week intervening. 



TETTIX 0RNATUS,5FIFTEEN DAYS' INCUBATION. 



On July 29 a specimen of Tettix ornatus laid eggs in vivarium and 

 they were marked by a tag. Suspecting that it was nearly time for the 



