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 
VEE 
TaBLE VIII.—Data on rearing of Hyperallus calirox. 
Period Period 
| from from 
Date of Date Date Number | confine- | emer- 
ono confine- | Condition of larve adult ited of para- | ment of | gence of 
a ment of when confined. sawflies Wes ered sites larvee to | sawflies 
larve. emerged. gee.) reared. emer- | to emer- 
gence of | gence of 
parasites.| parasites. 
— | | 
Days. Days 
IO GIS See ase eaeeeere Apr. 7] One-third grown..| None. | May 12 1 35.0!i| seceeeoeete 
Wile aacase peepee Apr. 16 | Nearly fuil grown.|...do....| May 17 2 Bl Oh aeseceeeee 
WN 4 2 foeoe2 25825254 aby; 92) eee Goise: sess aes July 26 | Aug. 10 2 29.0 15.0 
TGS tee eee co eee ATi 10) eee Osis, ose nee | Aug. 19 | Sept. 1 2 22.0 13.0 
Tee ss = ss os b= eee Avie: (12)\|\Baeo= owe teesason 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 
5 0 It Cee eae ees ‘Aug. 19) \|te222 (0 [eter Sia 1 Sept. 16 | Sept. 18 2 30.0 | 2.0 
Total and aver- 
APES meee eciecel teseGn ces | on niewiec ans ce maceceee lseinas semets | eee eeetase 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 lime-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. 
