May 31, 1924 
The Cambium Curculio 
383 
The insect in its active stages seems somewhat nocturnal in habits. Not only 
does oviposition take place principally at night, but 72 of the 88 larvae left their 
feeding places to enter the ground for pupation at night. The larvae burrow into 
the soil to a distance of from 1 to 3 inches to pupate; usually, however, pupation 
takes place about 1 inch beneath the surface of the soil. 
THE PUPA 
DESCRIPTION 
Pupa of Conotrachelus anaglypticus (fig. 1) uniformly white in color; length 
about 5 to 5.5 mm. Head rounded, beak elongate and attaining base of meso- 
thoracic legs; head with three pairs of setae borne on tubercles; beak with two 
pairs of setae borne on tubercles, one pair near base of antennae, the other pair 
between base of antennae and tip of beak. Prothorax subtriangular, rounded in 
front, with two pairs of antero-marginal setigerous tubercles, four pairs of latero- 
marginal, and three pairs of dorsal, setigerous tubercles. Mesonotum and me- 
tanotum each provided with two rather closely placed setigerous tubercles on 
each side of median area. 
Abdomen with eight distinct tergites, median area of each tergite with a 
transverse row of four setigerous tubercles each of which has at base a minute 
seta; lateral areas of each tergite with a setigerous tubercle at base of which is a 
small seta. Ninth abdominal segment ventral,' armed with a pair of stout, 
terminal spines. 
Tips of wing pads attaining the fifth abdominal sternite; tips of metathoracic 
tarsi not extending to tips of wing pads. Elytra armed with longitudinal rows 
of short hooks or spines. 
The pupa of C. nenuphar closely resembles that of C. anaglypticus but may be 
readily distinguished by its much larger size. Specimens forwarded to the writer 
vary in length from 6.5 to 8 mm. 
