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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.) hawse 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 

 larvce 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 inouth 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 

 larvtC do not necessarily in preparing for the jump, have to lie 

 on their sides. They may form the loop wth only the tips of 

 the caudal and cephalic ends touching the surface of the sub- 

 stance upon which they are feeding. One lar\^a under observation 

 sprung at least -1 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 fonned. The puparium 

 (Fig. 15) mesaures 4 to 5 mm. long b}' 1 to 1.7 mm. wide. Its 

 general shape is ovate, with the caudal end obliquely truncate, 

 and the antero-dorsal surface convexly and gradually depressed 

 from about the Gth segment. The ventral trans\^erse spines are 

 observable as one hea\'y dark regular row and two ixiler less 

 regular rows. The cc]:)halic segment is slightly bilobed. The 

 anterior spiracles are lateral to this segment. The posterior tu- 

 bercles are very prominent. Above these arc the stigmatal 

 lobes, upon the dorsal surface of which are the dorsal tubercles. 

 The pupal instar extended over a ])eriod of 12 days. Se\"cral 

 entomologists have observed shorter periods than this, from 1 

 week to 10 days, and it is not unlikely that under adverse condi- 



