3 12 
The Ohio Naturalist. 
[Vol. XIV, No. 7, 
The tracheae open to the exterior through two anterior and 
(a. s. p.) two posterior (p. s. p.) spiracular processes. The an¬ 
terior or prothoracic spiracles (Fig. 13) are situated laterally at 
the posterior of the second body segment. Each spiracle con¬ 
sists of from 8 to 10 short, rounded lobes. The posterior spiracle 
(Figs. 8, 9, 12) are each situated at the ends of two very short 
fleshy projections from the dorsum of the terminal body segment. 
They are .12 mm. apart and so situated that they face each other. 
When the caudal segments are retracted, the spiracular lobes 
become less prominent and the stigmata become closely apposed. 
The posterior end of the tracheal trunk divides into three parts, 
each part possessing a stigmatic orifice. (Figs. 8, 9.). 
The larval instar extended over a period of fourteen days, 
(average temperature 67 deg. F.) Larvae were reared on bacon, 
sweitzer cheese, ham, fresh lean or fat beef possessing a slight 
putrid odor. Murfeldt and others report that it occurs in cheese, 
ham, especially the fatty parts, and oleomargarine. In addition 
to the usual method of locomotion of the eruciform larva, these 
larvae at times leap or skip through the air. They accomplish 
this, to use the apt description of Prof. Putnam, by “bringing the 
under side of the abdomen toward the head while lying on their 
sides and reaching forward with their head and at the same time 
extending their mouth hooks, grapple by means of them with the 
hinder edge of the truncature, and pulling hard, suddenly with¬ 
draws them, jerking its self to a distance of 4 or 5 inches.” The 
larvae do not necessarily in preparing for the jump, have to lie 
on their sides. They may form the loop with only the tips of 
the caudal and cephalic ends touching the surface of the sub¬ 
stance upon which they are feeding. One larva under observation 
sprung at least 4 inches high and a linear distance of about 6 
inches. 
Prior to pupation, the larvae left the substances upon which 
they were feeding and crawled in between the cotton plug and 
sides of the vial. This took place about 32 hours before the pale 
to dark brown coarctate puparia were formed. The puparium 
(Fig. 15) mesaures 4 to 5 mm. long by 1 to 1.7 mm. v r ide. Its 
general shape is ovate, with the caudal end obliquely truncate, 
and the antero-dorsal surface convexly and gradually depressed 
from about the 6th segment. The ventral transverse spines are 
observable as one heavy dark regular row and two paler less 
regular rows. The cephalic segment is slightly bilobed. The 
anterior spiracles are lateral to this segment. The posterior tu¬ 
bercles are very prominent. Above these are the stigmatal 
lobes, upon the dorsal surface of which are the dorsal tubercles. 
The pupal instar extended over a period of 12 days. Several 
entomologists have observed shorter periods than this, from 1 
week to 10 days, and it is not unlikely that under adverse condi- 
