42 
Tt was first met with in the course of the observations upon Orgyia 
on August 30,1895. A larva of the Orgyia which had already spun 
up could plainly be seen to be parasitized. A large dipterous larva 
could actually be seen through itsskin. No eggs, however, were found 
upon its body. It was placed in a vial to breed and on the following 
day two Tachinid larve left the empty and dry skin of the caterpillar 
and transformed to puparia, which, however, dried up and nothing 
was reared fromthem. On September 7 a tussock-moth caterpillar was 
found which bore Tachinid eggs upon its back, and from this larva an 
adult of this species issued on September 18. On September 20 
an adult emerged from a puparium the larva of which issued from an 
Orgyia larva found September 5, and which was collected for the 
reason that it had a black spot around one of the spiracles; the larva 
issued on September 9 and transformed to its puparium, making the 
duration of the puparium stage eleven days. The same day a specimen 
issued from a tussock-moth caterpillar which was observed upon Sep- 
tember 11 to have been oviposited in by Pimplainquisitor. OnSeptember 
6 an Orgyia cocoon was opened which contained a chrysalis upon which 
a dipterous larva was apparently feeding externally. This maggot con- 
tracted into a puparium, and a fly of this species issued on September 
23. On September 15 a full-grown tussock-moth caterpillar was found 
which had a sick appearance and a pale-colored head. On September 
18 a full-grown Tachinid larva issued from it and contracted, and the 
fly issued September 30. The total number of specimens of this insect 
reared was forty-five. They issued quite regularly through Septem- 
ber; two specimens appeared in October, one in January, two in Feb- 
ruary, and the remainder between the 14th and 27th of July, 1896. 
During the examination of Orgyia cocoons in the winter of 1896 no 
specimens of this insect were found in any stages. In all probability 
it hibernates as an imago. 
Frontina frenchii Will. 
This species is very widespread, occurring from Massachusetts to 
California, and has been reared from no less than twenty-two different 
species of Lepidoptera, including Bombycids, Noctuids, and Rhopalo- 
cera (Papilio turnus and Pyrameis cardut). 
In the Orgyia observations it was not an important species and was 
not reared at all in 1895. Seventeen specimens were reared, all in July, 
1896. In the case of two of the specimens the flies issued July 6 from 
two puparia found June 29. There is nothing in the observations 
which indicates the duration of any of the different stages. 
Tachina mella Walker. 
This species is also widespread, occurring in Toronto, Canada; Fran- 
conia, N. H.; Massachusetts; New York; District of Columbia; West 
Virginia; Florida; Texas; New Mexico; California, and Oregon. It has 
