36 
PEELIMINAEY EEPOET ON ALFALFA WEE\aL. 
The disposal and management of this species did not differ from that 
followed mth the preceding, except that some of them were received 
too late in the season to use in the low yalleys because the majority 
of the eggs of the weeyil had already hatched. Owing to this the 
parasites were taken to places in higher eleyations 
where eggs of Phytonomus were still abundant. 
Approximately 460 were placed in field cages like 
those previously mentioned and treated in the 
same way. 
Mr. Fiske found this species to be very effective in 
controlling the alfalfa weevil in Italy. 
Parasites of Larv^ axd Pup.^. 
The parasites of the larvse and pup?e of the alfalfa 
weevil, which were five in number, did not appear in 
Fig. i7.-Larva of ^^^® carli^ consignments from Italy and were confined 
pteromaiid egg to the last three received at Salt Lake City May 16 
aifeKa*^ wJerfh ^^ Jime 3.' In thcse three shipments were metal 
Greatly enlarged. boXCS (PL X, fig. 2), whlcll includcd Ouly the COCOOUS 
(Original.) ^^ ^|^^ alfalfa weevil. These boxes were especially 
devised to guard against the accidental escape of adult insects of 
any species en route. 
After being removed from the boxes in wliich the cocoons were 
received, they were placed in parasite boxes of the larger type 
(PL XI, fig. 3), where the parasites emerged and were 
separated from the weevils that had developed en route. 
Both weevils and parasites on emerging from the cocoons 
in the box would seek the light and appear in the glass 
tubes shown in the illustration, where they were readily 
separated and the weevils killed. The parasites were 
then transferred to glass cages (PL XI, figs. 1, 4) which 
had been previously well stocked with larvae and cocoons. 
pteromalid larval parasite. 
A pteromalid parasite of alfalfa weevil larvae (fig. 19, 
female; fig. 20, male) was received in only the later fig.is.— Pupa 
consignments. Thus far it has not been possible to deter- 
mine the species. In the laboratory rearings, preparatory 
to placing the parasites in the field cages, and later, the 
species was carried through five generations. (Fig. 21, a 
shows the pupa of the alfalfa weevil, with the egg (fig. 21, Z)) 
as it is placed on the pupa; fig. 22 shows the larva, and fig. 
23 shows it destroying the pupa of the alfalfa weevil; fig. 24 shows the 
pupa of the parasite itself.) In order to accomplish this, however, it 
was necessary to secure weevil larvae, as hosts for them, from high 
of ptero- 
malid egg 
parasite o f 
the alfalfa 
wee V i 1 . 
Greatly en- 
1 a r g e d . 
(Original.) 
