68 
is a month or six weeks in the field. Table I gives the main points 
in the life history of eight individuals, but owing to the space it would 
require it seems impracticable to include the tables which we have drawn 
up showing all the details in the development of each individual larva. 
TIPHIA TRANSVERSA Say 
Although seemingly not so abundant as the species just discussed 
T. transversa (Fig. 1) seems to be fairly general in its distribution in 
the northern states and is usually to be found in the same surroundings 
as that species. According to specimens determined by Gahan in the 
National Museum and in our own collection, it occurs in the states of 
Vermont, New Hampshire, New York, Connecticut Pennsylvania, Mary- 
land, Virginia, Ohio, Indiana, Wisconsin, and Arkansas. 
The habits of oviposition agree with those already described except 
in the position of the egg on the grub. Of the 90 eggs laid by seven 
individuals all were placed transversely on the under side of the ab- 
domen in a groove or fold of the skin (Fig. 2, b), usually just to one side 
of the median line and on segments 3, 4, 5, or 6, usually on 4 or 5. When 
laid to one side of the median line the polar region of the egg invariably 
is nearest the median ventral line. The largest number of eggs laid by 
a single female was 35, and as will be seen by the accompanying table 
(Table IL) the date of emergence, length of egg stage, length of larval 
stage, etc., very closely approximate those of T. punctata. Dates of 
emergence in our breeding cages were from June 30 to August 21, and 
of those reared from cocoons collected in the field and recorded as to 
sex, three were males and eight females. Except for the position of the 
egg on the grub there is no noticeable or constant difference between 
the habits and life histories of the two spectes. 
TIPHIA INORNATA Say 
This species, the largest of our Tiphias, is found, according to 
specimens in the National Museum and our own collection, in Canada, 
New Hampshire, Maryland, Ohio, Indiana, Illinois, and Wisconsin, 
and would therefore appear to be typically a northern species. 
We have obtained eggs from only three individuals of mornata, but 
every one of the 22 eggs was laid on the under side of the thoracic or 
first abdominal segments, usually between the second and third thoracic 
segments and to one side of the median line, not infrequently relatively 
distant from the median line and between the legs. The egg period 
extended over a much longer time than for other species, that is, from 11 
to 23 days, and this doubtless was due to the fact that the eggs were 
laid early in spring, when the temperatures were much lower. The 
adults of this species appear early in spring, as has already been stated, 
the dates of emergence ranging according to our records from April 8 
to May 15, although we have found adults on wild parsnip flowers as 
