170 TF.TTlGrO.E OF NORTH AMERICA 



young to appear 1 took up the eggs to find only empty shells, the young 

 having escaiied. There was a new brood hatched on the fourteenth inst., 

 but I could not locate the spot from which they emerged; it is more than 

 probable they came from the above-mentioned eggs. This being true, they 

 hatched in fifteen days. The weather has been unusually warm, thus favor- 

 ing rapid incubation. 



A SPECIMEN OF TETTIX ORNATUS HATCHING WAY 31 LIVES 

 UNTIL AUGUST 9 IN VIVARIUM. 



Of seven specimens hatched May 31 only one now remains alive. 

 There were two of this brood "bilineate," having light side stripes on the 

 pronotum; the rest were brownish with dark spots above. August g, 1898. 



TETTIX ORNATUS HATCHING IN JUNE COMES TO MATURITY 



AUGUST 14. 



A specimen hatched in June has shed its last skin, coming to maturity 

 August 14, 1898. 



TETTIX ORNATUS AND TRIANGULARIS IN CONJUGATION, 

 ESTABLISHING THE FACT THAT THESE ARE THE SAME 

 SPECIES 



I caught thirteen specimens of Tettix at Cheltenham (Chicago) in the 

 same locality I had taken them on previous years. An abandoned road 

 covered now by grasses, lichens, strawberries, and a multitude of other 

 plants, was the source of these specimens. The land is sandy below the 

 superficial layer of vegetable mold. There was one male granulatus, the 

 others representing the forms ornattts and some triangtclaris. At 9 o'clock 

 a. m. all the specimens which were put in a vivarium jar were awakened 

 to activity by the warm sunlight pouring in upon them through the window. 

 I saw at two different times a male triangjilaris in conjugation with a 

 female ornatits (long-wing form). In one instance they were together 

 several minutes, establishing beyond doubt that these two forms belong to 

 the same species. Confirmatory of this is the fact of their being found 

 associated together in nature. May 8, 1898. 



OVIPOSITION OF TETTIX ORNATUS — MALE STAYS ON THE 

 FEMALE'S BACK DURING PROCESS — EGGS SHALLOWLY 

 DEPOSITED IN THE GROUND. 



At five minutes of nine o'clock a. m., I noticed a female Tettix ornatus 

 (in vivarium) on a little patch of lichen-covered ground with her abdomen 

 curved under her, ovipositing. A male is on her back, and though burdened 

 by him a very slight up-and-down motion is perceptible in the female's 

 body. Her position is peculiar, the front and middle pair of legs .raised so 

 she is standing on tip-toe, while the back legs are drawn up partly to the 

 sides, out of the way, and taking no part whatever in the operation. I 

 looked in the jar a short time previous, and the female had not taken her 



