THE PARASITES OF POPILLIA JAPONICA 
31 
CHARACTERS FOR DETERMINING THE IMMATURE STAGES OF DEXIA VENTRALIS 
First-stage larva (fig. 20, A). — Length of newly hatched larva approximately 
1 mm.; color white. Mouth hooks present; pharyngeal plates as in C. Sensory 
papillae prominent. Derm minutely sculptured with rows of reniform eleva- 
tions. Posterior spiracles stalked. Two long caudal setae. 
Third-stage larva. — -Although this is not illustrated, the nature of the caudal 
spiracles may be understood from those of the puparia. Tracheal funnel 
always attached to the derm of the host (fig. 21, B). 
Puparium (fig. 14, A). — Length 8 mm.; color dark brown, reflections dull, 
surface finely striate. Posterior spiracles divided into three lobes, each bearing 
an elongate depression of the former tracheal openings. 
CAMPSOMERIS ANNULATA Fabricius 
GENERAL OBSERVATIONS 
Campsomeris annulata (fig. 23) was found rather infrequently at 
Suigen, Chosen, in August, 1923, and during the following month five 
Fig. 23.— Campsomeris annulata, female 
females were captured in the field. Specimens of both sexes were 
submitted to S. A. Rohwer, of the Bureau of Entomology, who made 
the determination. One specimen in the collection of the agricul- 
tural experiment station at Suigen bears the name Elis ventralis 
Smith, and under this name is reported by H. Okamoto to be 
common on Quelpart, a volcanic island lying a short distance off the 
southeastern point of Chosen. The species is also recorded from 
Japan as well as oriental Asia. 
Experiments were conducted to determine the true host, since the 
size of the females was such as to permit of development on grubs of 
Popillia japonica. In the first experiments eggs were laid freely 
upon grubs of Anomala sp. and upon P. atrocoerulea, and later when 
mature grubs of P. japonica were obtained and supplied to the 
Compsomeris females, oviposition took place as readily as upon the 
two species previously mentioned. Considering the distribution of 
