102 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 
The developmental period of the parasite is somewhat longer nor- 
mally than that of its host. 
The data on the development of the parasite are given in Table 
Wallis 
Tasie VIII.—Data on rearing of Hyperallus calirox. 
| Period | Period 
from from 
Date of Date Date Number | confine- | emer- 
Tot No confine- | Condition of larvae adult iice of para- | ment of | gence of 
x ; ment of when confined. sawflies oe pend sites larvee to | sawflies 
larve. emerged. gee.) reared. emer- | to emer- 
gence of | gence of 
parasites.| parasites. 
Days. Days 
EL eee ee ae Apr. 7 | One-third grown. . None. | May 12 1 3020) 3 eee 
TIO Syn s e-ee Apr. 16 | Nearly fuil grown.|...do-....| May 17 2 310) |S Sese eee 
A Seve, Soe eS marae July; 12) \e5--2 dov:25: 2: seehee July 26 | Aug. 10 2 | 29.0 15.0 
MGS Se SSeS eee AE) LO Aaa Ggsssennoueaee | Aug. 19} Sept. 1 2 | 22.0 13.0 
Teka le sesamiae ate ee Nig 128 eames domes essa | Aug. 20| Sept. 3 1 22.0 12.5 
Aug. 22 | Sept. 4 1 23.0 13.5 
Aug. 23 | Sept. 7 1 26.0 16.5 
TTS Bees a ese ASTI eyo in) Pereyra CO. eeee. eae 1 Sept. 16 | Sept. 18 2 30.0 2.0 
Total and aver- 
AP OStatic ee) Pe ee cciee | eu cceeeNacicteom ene eee es ae ete 12 | 27.5 14.1 
1 This sawfly was undoubtedly from a prepupa, which held over beyond the normal time of emergence 
for the brood, and the figure corresponding to it in the last column is omitted from the average. 
The parasite enters the ground in the body of the host and develops 
within the pupal cell of the latter. When it has entirely consumed 
its host and is full grown, it makes a very thin, brown, parchment- 
like cocoon within the pupal cell and changes to the pupal stage, 
emerging later as a light-brown and yellowish wasplike fly. 
This parasite is evidently not very abundant, as none was seen about 
the trees, and only 13 individuals were reared from the several hun- 
dred larve of the sawfly confined. 
. REMEDIES. 
Lack of time prevented the writer from making any tests of reme- 
dies. Without doubt, however, an arsenical spray, such as arsenate 
of lead, would very effectively destroy these insects, and this poison 
is advised when the insects occur in sufficient numbers to warrant 
treatment. The rapid increase in the spraying of peaches and 
plums with arsenate of lead in self-boiled ime-sulphur wash for the 
control of the plum curculio and fungous diseases of the fruit will 
unquestionably result in keeping the peach and plum slug well 
reduced in orchards. Its occurrence in injurious numbers is to be 
looked for largely in small unsprayed home orchards, and the 
remedial measures indicated should be followed when its presence in 
undue numbers is noted. 
O 
