NO. 1124. xKrisiox or THI: MELAXOPLI SCUDDI u. 189 



but particularly in the southern end of the valley; August 2-3, Amer- 

 ican Fork Canyon, Utah, 9,500 feet; August 6, Evanston, Wyoming, 

 6,800 feet, plenty; August 11-16, South Park, Colorado, 8,000 to 10,000 

 feet, everywhere, mature; August 13, Mount Lincoln, Colorado, 11,000 

 to 13,000 feet, crowds of nymphs and images, as well as masses of dead 

 imagos under stones at summit; August 17-22, Florissant, Colorado, 

 8,000 feet; August 24, Pikes Peak, Colorado, 12,000 to 13,000 feet; 

 August 24-25, Manitou, Colorado, 6,300 feet; August 26, Colorado 

 Springs, Colorado, plenty; August 28-29, Garland, Colorado, 8,000 

 feet, plenty ; August 29, Sierra Blauca, Colorado, below 10,000 feet, none 

 seen above timber; August 30-31, Pueblo, Colorado, 4,700 feet, plenty; 

 August 31, Animas, Colorado; September 1, Lakin, Kansas, plenty. 



I have also seen specimens from the following localities, which have 

 some special interest: Fort Hayes, Kansas, collected by J. A. Allen in 

 June, 1871 (not heretofore reported in Kansas in this year); Preston, 

 Texas, Captain Pope, May 15, 1854 (necessarily the progeny of an invad- 

 in-g flight in a previous year, and none are recorded either in Texas or 

 Arkansas between 1850 and 1853, inclusive); Binggold Barracks, on 

 the Lower Eio Grande, A. Schott, presumably also in the spring of 

 1854, when the Mexican Boundary Commission was at work there; 

 Sonora, Mexico, A. Schott, and San Lorenzo, Chihuahua, Mexico, E. 

 Palmer, showing that it reaches Mexico, and that too even as far west 

 as Sonora. I have also a single specimen from California from Mr. H. 

 Edwards, but it may have been taken in that part of the State east of 

 the Sierra Nevada. 



A tabular view of " locust years " for the different States will be 

 found in the first report of the Commission, page 113. 



This insect is normally single brooded; the eggs winter and the 

 earliest (those in warm exposures) hatch in Texas from the middle to 

 the last of March, and " continue to hatch most numerously about four 

 days later with each degree of latitude north," so that in Montana and 

 Manitoba it is from the middle of May to the first of June. This is in 

 the temporary region ; probably it is correspondingly later on the higher 

 levels of the permanent breeding grounds. The young reach maturity 

 in sixty to seventy- two days, to judge from those reared in confine- 

 ment, and after a few days couple, the female beginning to lay eggs in 

 about a fortnight thereafter. The eggs arc laid in almost any kind of 

 soil, but by preference in bare, sandy places, and in their permanent 

 home they show a preference for the shaded base of shrubby plants; 

 they are laid in a sort of pod, with a quadrilinear arrangement therein. 

 Several pods may be laid by a single female, Mr. Eiley having on 

 three different occasions obtained two pods from single females in con- 

 finement, laid at intervals of eighteen, twenty-one, and twenty-six days, 

 respectively. 



The migratory instinct appears to be strongest within about three 

 weeks from the time of attaining maturity, or shortly before and during 



