REPORT OF THE ENTOMOLOGIST. 293 



in this valley the present season were produced from eggs that had 

 been deposited here during the preceding autumn. 



As above stated, when I'arrived at the Buhach plantation the locusts 

 were most abundant along the outer edges of the orchards and vine- 

 yards, while the more central parts were almost wholly free from them. 

 Kow, if the locusts had migrated to this plantation, would they not 

 have been found as often in the center of the orchards and vineyards 

 as along the outer edges? But if the locusts had hatched out upon the 

 plautation we should expect to find them the most numerous in the vi- 

 cinity of uncultivated land, where the eggs would not have been dis- 

 turbed by the plow and cultivator ; and this was exactly the situation 

 where they were the most numerous — in the vicinity of the uncultivated 

 laud along the outer edges of the orchards and vineyards. Had the 

 eggs been deposited last autumn in the more central parts of the or- 

 chards and vineyards, the subsequent cultivating of these would have 

 destroyed the eggs, so that no locusts would have hatched out in such 

 situations ; and none were found there. 



Moreover, I found upon the uncultivated land referred to above quite 

 a number of young locusts, which were evidently the young of the De- 

 vastating Locust {21. devastator), since, in their markings, they approach 

 that species more closely than they do any other of the Spine-breasted 

 Locusts which inhabit the San Joaquin Talley. The following is a de- 

 scription of these young locusts, drawn from fresh specimens: 



Head, aslien-gray, whitish below each eyo. Thorax, ashen-brown ; two dark-brown- 

 ish subdorsal stripes, one on each side, and below each is a whitish line, then a dark 

 spot bordered below by a whitish line. Abdomen, ashen-pink, mottled with dark 

 brown. Venter, whitish, unmarked. Legs, ashen-yellow ; hind femora with a longi- 

 tudinal black stripe on the outer side, interrupted at the middle of the femur and sub- 

 interrupted at the first one-fourth ; upper side of hind femora marked with three 

 black spots, the first at one-fifth, the second at two-fifths, and the third at two-thirds 

 the length of each hind femur from its base, the first spot sometimes wanting, the 

 second and third spots extending slightly upon the inner side of each hind femur 

 before the tip. There is a blunt spine between the front legs. 



In all of these characters the agreement with the adult Devastating 

 Locust is very close. There are only three species of Spine-breasted 

 Locusts inhabiting the San Joaquin Valley which approach this species 

 very closely in their markings ; and from each of these both the adult 

 Devastating Locust and the young locusts above described difler as 

 follows : 



JUeJanoplus cinereiis Scudder (the Ash-colored Locust), has no black 

 spots on the hind femora. 



Mclanophts sp. (probably only a variety of ddi'astator) has no distinct 

 black subdorsal stripes on the thorax. 



Faroxya sp. (near atlayitica Scudd.) has the subdorsal stripes of the 

 thorax well defined, not interrupted, and of nearly the same width 

 throughout their entire length, while in the adult Devastating Locust 

 aud the young ones above described these stripes taper posteriorly, are 

 not well defined, and are generally interrupted. 



These young ones quite closely resemble those of the Differential Lo- 

 cust {Caioptenus differentialis Thomas), but differ in having no black 

 dots on the groove on the under side of each hind femur. 



It seems quite evident, therefore, that the young locusts above de- 

 cribed are those of the Devastating Locust, the species which committed 

 the most extensive depredations in the San Joaquin Valley the present 

 season ; and if they were the young of that species, then the latter 

 breeds in the San Joaquin Valley, since it would have been quite im- 

 possible for these young ones — many of which were not more than one- 



