1874 (twelve years ago), show no differences when compared with recent 

 specimens from this locality, except perhaps that the species has grown 

 slightly more robust. Yet it undoubtedly varied in its normal state in 

 the West, before it began to increase and take to the potato. The in- 

 teresting particulars of its yearly eastward spread since 1859 ^^^ given by 

 Packard in his Report on the Rocky Mountain locust and other injurious 

 insects of the West (Rep. of Geol. & Geog. Survey for 1875, p. 722-6). 

 Say gives its original habitat as the Upper Missouri, and mentions a 

 white variety with two of the lines united, supposed to be jiincta Germ., 

 which he took on the Arkansas. This latter form, which differs from 

 lO-lineata in the larva state as well as in the imago and is now considered 

 a distinct species, is found in the more southern States and according to 

 Packard originally represented the latter on the eastern slope of the Rocky 

 Mountain Plateau. It is one of the old-time variations of lo-lineata. 

 Glover has mentioned and figured a form (U.S. Agr. Rep. for 1869, p. 

 123) which he says "is an apparent cross between the two {lO-lhieahi 

 a.ndju?ic/a), or a variety once found in the South, in which the heavy, 

 thick black line o(iheju?ic/a has a very fine yellowish line running partly 

 through it longitudinally". 



I have a specimen from Missouri (near St. Louis, taken June 29th, 

 1884), which has a well xm.rked purp/is/i line running partly through the 

 heavy black one longitudinally, and with the elytra purplish next the 

 suture and around the edges; otherwise as xnjuncta, of which these last 

 two are variations. Another form, defeda Slal, is recognized as a variety 

 of lo-lineata, but is a more modern variation than juncta. These three 

 forms are represented in Mexico, Costa Rica and parts of western South 

 America by ii-lineata Stal, from which lo-lineaia probably originated, 

 and subsequently gave origin Xo juncta and defecta. This interesting- 

 representative of the ancestral form of the "Colorado potato-beetle'' has 

 recently been recorded within our territorial limits. 



Eight specimens of c//z'/c(;///5 Kirby taken here at different times 

 show a series of four finely marked forms: five of the normal form; one 

 in which the normal posterior marking of each elytron, formed by two 

 linear markings meeting at an acute angle forward, is represented by a 

 three-sided blotch; and two very strikmg variations, in one of which the 

 two anterior markings of each elytron are united in one broad black 

 band across both elytra, while in the other the same broad band is 

 present but with the posterior three-sided blotch also. These are two 

 very interesting variations, especially as this is quite constant compared 

 with many others. 



As another example in another genus of the family, I would mention 

 Lina (formerly Plagioderd) scrip/a Fab. This species, which I have taken 



