18 SOME ENSECTS INJURIOUS TO TRUCK CROPS. 
stems, evidently by simply tumbling out to the ground, into which 
they crawl and attack the roots by boring in from outside. 
FOOD PLAXTS AXD HABITS. 
Mosr collectors of Coleoptera who have had opportunity to observe 
aquatic and oth< - beetles that frequent p ods and w 
courses are familiar with the fact that the genus Listronotus is I 
>und in the greatest abun n aquati - ... ants, 
more particularly on Sagittaria. Years ago Dr. C. M. Weed m 
observations on the present curcuho and its food habits."- He 
found the larvae in seed capsules or hea s is well s in stalks. : 
the common arrow-head SagiUa iabUis and furnished some 
interesting observations on the insect's life history. Be< les 1 gan 
to emerge September 23 in Ohi< . continuing emergence until the 
mid ber. The length of the pupal stag - rmined 
- leven days. The duration of the egg stage should be about the 
same at the same temperature . but in a high temperature in a warmer 
late like that of Washington egg- might develop in seven di - 
while the larval stage is of only a few weeks' duration. During the 
- ume year that Doctor Weed wr< te : this species, the late Wilhelni 
Juelich informed me that he had found the beetles near New York 
City in the lower parts of reeds (Phragmites , near tl ins. 
In the Bureau of Entomology we have a record of the finding of 
the larva by Mr. A. Koebele in August. 1884, in Virginia, near the 
District of Columbia, in the - tpsules of a spec: s I Sag 
August 31. The beetles developed in great numbers, beginning 
mber 22. 
It is not usual that phytophagous Coleoptera develop in so many 
■; plant as in the - sent s - which exis s 
rva in the seed capsules and stalks of one plant and in the i< \& 
of a different plant.- It is i. able that it would be live 
in portions of purely terrestrial plants other than the ts or stalks 
near the ground, because the insect t ridently requires a n: 
usual degree of moisture. In other words - semiaquatdc. 6 
« Bui. Ohio Agr. Exp. Sta., Tech. Ser.. Vol. I, Xo. 1, pp. 10, 11. 188 
>mpare the writer's observations with others on the biol _ 
elegans (Bui. 18, n. s., I), which breeds commonly at the roots of Amaranthus 
and 1 stated by others to live on hick :iown to be de- 
posited in rolled-u: ! hickory. : : :>bable that the be Lop in 
some other portion of that plant * genetic plum curculio 
s in the plum and other stone frui: a, 
in black-knot (Plowrightia mor 
