il, '08] _____ENTOMOLOGICAL NEWS. 165 
urg, Pa., during the summer of 1906. Extensive pasture 
fields, profusely covered with Iron Weed, are ‘situated near 
y home, and late in 1905, I examined many of these plants 
i the roots of a great many infested by larve. 
early August, 1906, closely observed the Iron Weed 
a IIS al ony way Heme from work I usu- 
“ally arrived there about 5.45 P. M. which would seem late in 
the day for collecting Sesias. But this field had the benefit 
_ Of the late afternoon sun and on August 13th, I observed three 
Specimens and captured two of them. The following evening 
and up to September oth, numerous specimens were taken. 
_ Imagos were on the wing from 1o A. M. to sunset. Pairs 
‘Were taken in copulation from noon to 6 P. M. In one in- 
oon a female was observed to deposit an egg on the under 
= of a leaf. The larva enters the stem from 1-3 inches 
base and bores down into the roots. Pupation occurs 
F galleries beneath the surface in the old part of the root- 
. about the end of July. Period of flight, August 13th 
7, ee and September, 1907, while employed at the 
a. Merrick Museum, New Brighton, Pa., I collected several 
dozen specimens in the vicinity of that town. By October 
_ 22nd, several frosts had occurred and the Iron Weed plants 
_ were killed. I took up several infected root-stocks and found 
the larvae: in various stages of development, ranging from 12- 
18 mm. long. The following description was taken from the 
larger larve. 
Length, 18 mm., head 1.60 mm., wide, bilobed, light chest- 
nut brown. Mandibles and ocelli dark brown. Front of 
head sparsely covered with light brown hairs. Thoracic shield 
pale brownish. Body semi-translucent, watery white. A 
brownish dorsal shade broadening on the somites and in the 
intersections. An indistinct whitish stigmatal line. Spiracles 
oval, light brown. Thoracic legs concolorous, clouded with 
pale brown outwardly. Abdominal legs concolorous, claws 
circular, light chestnut brown. Tubercles not prominent, in- 
