316 



yellow and shining, edged laterally with shining black. Legs black. Pro- 

 legs and body beneath pale yellow. The head of this caterpillar is large, 

 subquadrate, not retractile. The legs and prolegs long, and the motion 

 very active. The livid brownish color of the intermediate segments extends 

 more or less in different specimens under the body of these same segments. 

 Motion somewhat like that of a Geometrid, the back arched, and the first 

 pair of prolegs, though as long as the others, not used in creeping. 

 Found one also in pigweed Stalk, July 5, 1851. 



Agrotis sp. 



July 9th, 1848. From cabbages. Length one and one quarter to one 

 and a half inches. Very minutely granulated above. Head small, retractile. 

 First ring with a brownish corneous plate. Last ring with clappet shining 

 and brownish, divided lengthwise by a pale line in the dark colored individ- 

 uals, the same ring in others wot conspicuously darker or more shining than 

 the rest of the body. Legs sixteen, whitish. 



Curls laterally and conceals the head by retracting it completely when 

 disturbed. Each segment with four dorsal, black, shining, tubercular, seti- 

 ferous points, and two tubercular points on each side above the lateral fold, 

 and near to the black spiracle. On all the segments except the last (clap- 

 pet) the tubercular points on the back are in two rows or pairs, the anterior 

 pair more approximated than the posterior. On the last segment the four 

 points form a semicircular, transverse row. The color of the specimens va- 

 ries. The darkest are of a dusky or bluish black color above, and bluish 

 ash colored below, with a greasy appearance. The lateral fold below the 

 spiracles is whitish; and there is a broad, pale stripe down the back divided 

 by a dusky, longitudinal, dorsal line. Head pale brown, mottled with black 

 on the cheeks and above, and with the eye spots also black ; anterior trian- 

 gle, palpi, and feet pale. Dorsal plate on the first segment brownish black. 

 Anal plate pale brown, and with four blackish blotches. In other individ- 

 uals (and these appear to be the most common and the oldest) the dorsal 

 stripe and pale line are not conspicuous, and the whole insect may be .said 

 to be dusky or bluish black above, livid or paler below, with shining black, 

 setiferous points on the segments, and the lateral fold rather paler than the 

 rest of the body. The head and corneous plate on the first ring bluish. 

 Anal clappet horny and blotched with brown. Legs whitish. Some indi- 

 viduals are found of the same pallid or livid color above and below, in Avhich 

 also the lateral boundaries of the dorsal band are distinguished by being 

 somewhat darker than the rest. 



Hadena arnica. 



June 1st, 1850. Cut-worm that cuts off currant shoots. 



