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 are 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). 

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

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

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

 10-litieala 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 10-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 (10-lineala 

 and juncta), or a variety once found in the South, in which the heavy, 

 thick black line of the juncta 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 marked purplish line running partly through the 

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

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

 two are variations. Another form, defecta Stal, is recognized as a variety 

 of 10-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 1 i-lineata Stal, from which 10-lineata probably originated, 

 and subsequently gave origin to 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 clivicollis 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 striking 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 

 Una (formerly Plagiodera) scripta Fab. This species, which I have taken 



