174 TETTIGID.E OF NORTH AMERICA 



TWENTY-THREE DAYS THE TIME OF IN'CUBATION IN 

 TETTIX ORNATUS. 



At 9:30 a. m. larvas emerged from eggs I saw deposited May 10 at 

 10:50 a. m., twenty-three days ago, thirteen individuals coming out almost 

 simultaneously with little intervals between. These eggs were showing 

 from above, so shallowly were they oviposited among lichens. June I, 1898. 



HOW THE LARVA THROWS OFF THE AMNION, DESCRIBED 

 IN DETAIL IN TETTIX ORNATUS. 



10:55 a. m. Now under my eyes the fourth and fifth larvae of a new 

 brood of Tettix ornatus are emerging from the ground. The last, or fifth, 

 is forced up out of the ground like a little mummy encased in the veil-like 

 amnion. The legs pinioned to the sides and head foremost it comes up like 

 a sphinx. In a moment more the legs move vigorously, spreading and 

 rending them loose from their cramped quarters and convulsive movements 

 of the body cause a rent in the delicate amnion. Now the vestment is 

 rapidly pushed off backward and, free to breathe, the young kicks it off 

 hurriedly, and in little folds it gathers at the tip of the abdomen, when with 

 a final kick the body is released of all incumbrance. The pale white body 

 is free to commence life's struggle; each individual, endeavoring to 

 separate from the egg site, starts off, little by little leaving the place of its 

 l)irth, moving towards the light, then remaining quiet, drinking in the 

 sun's warm rays, and transforming rapidly into the ground colors for its 

 protection. Eight finally hatched from the above brood. At 11:18 a.m. 

 seven are hatched, and another at 11:33 appears. June 4, 1898. 



APPEARANCE OF THE EGG OF TETTIX ORNATUS JUST 

 BEFORE HATCHING. 



The freshly laid eggs of Tettix ornatus, as shown in the plate, are more 

 slender than those well advanced in incubation. Just before hatching they 

 become more swollen and are quite smooth; the tail-like extremity of the 

 upper pole looks smaller. Held to the light, the dark eyes of the embryo, 

 whose head now occupies this pole, can be discerned through the egg shell. 



TETTIX ORNATUS, HAVING BUT ONE LEG, COVERS HER 



EGGS. 



At 3 p. m. Tettix ornatus spent fifteen minutes depositing her eggs 

 in vivarium. The specimen has but one hind femur, which she used to 

 cover the eggs. I could see her clearly working, viewed from profile, and 

 I observed that her hind claws are used to scrape the particles into the 

 hole; particles of considerable size were pulled along. This female is gray 

 ish on the pronotuni, with blackish markings. Fifteen minutes were spent 

 in covering her eggs. June 5, 1898. 



