104 
ON THE HABITS AND LIFE HISTORY OF DIABROTICA 12-PUNCTATA 
j OLIV. = 
By C. V. Riney. 
In Psyche for February and March, 1891. Prof. H. Garman, of the 
Kentucky Agricultural Experiment Station, gives a detailed and lengthy 
summary of the literature on the subject of the habits of this well-known 
ehemy of cucurbitaceous plants. and follows with a careful account of 
his observations upon its early states, showing that during 1859-90 the 
damage of the larve to corn attracted attention over a wide area of 
country, including the States of Virginia, Alabama, Mississippi, Louist- 
ana, Arkansas, Kentucky. [llinois, and Ohio. His own observations 
began July 15, 1859, and in brief may be summarized as follows: 
Fic. 3.—Diabrotica 12-punetaia: a, egg—greaitly enlarged: b. larva: c. corn-stalk showing punctures; 
d, pupa: ¢, aduli—5. d. and e enlarged (origimal). 
The young larve were noted upon July 15, 1889, and became full 
grown by the 29th of the same month, they having pupated in small 
cells in the earth at the latter date. Adult beetles dissected at this 
time contained eggs of a relatively large size. August 3 most of the 
larve had pupated. No very young worms were seen. and one adult 
was found. A second brood was expected. but towards the end of 
August the females had disappeared and none were observed with 
developed eggs during the remainder of the season. Larve and pup 
were rare from this time on until the first of November, when, in a field 
of late-planted corn, numerous larve, pup, and recently transformed 
adults were found. Observations made by Mr. Lugger showed that the 
insect breeds upen the roots of Rudbeckia, and Professor Garman sur- 
mises that the majority of the second brood will be found to breed upon 
