ON THE LIFE HISTORY OF UGIMYA. 23 



The time of the day when the maggot leaves the cocoon, is gener- 

 ally in the morning, especially of bright and hot days ; the number of 

 those that come out at other times is very small. 



The mature maggot which thus becomes free is very active, and in 

 order to change into the pupa, generally crawls into the ground, effect- 

 ing its progress by means of alternate contractions and expansions of its 

 body, aided by the setœ which cover it as well as by its hooked jaw. 



The adult maggot (PL IV. fig. 7,7 A) is, yellowish white in color 

 and cylindrical in form. Its anterior end is sharply pointed while its 

 posterior end is broad and abruptly truncated. It is about 20 mm. 

 in length and 6 mm. in breadth. The body {PI. IV, fig. 8) is com- 

 posed of twelve segments; each segment is provided in its front half 

 with several transverse rows of minute black setœ ( PI. IV, fig. 8 h), 

 and marked with a series of transverse wrinkles as well as with a few 

 longitudinal wrinkles placed laterally. 



On the front part of the first anterior segment, there are situated 

 two pairs of processes, the top of each of which is formed into a circular 

 space provided with a brown rim {PI. IV, fig. 8 c, fig. 9 h). Tlie anterior 

 pair of these seems to correspond to the antennœ, and the hinder, to 

 the maxillary palpi, which A. Weismann (^) has pointed out on the 

 larvae of the Muscidœ. On the posterior edge of the second segment 

 lying close to the third segment, there is situated on each side a narrow 

 brown ridge (PI. IJ^, fig. 8 d, fig. 10 a), which is perforated by five 

 small spiracles, each with a brown colored rim. Again, on the pos- 

 terior edge of the fifth seginent, tliere is on each side a fleshy protuber- 

 ance (PL IV, fig. Sa) the entire surface of which, excepting a small 

 circular space in its centre, is thickly covered with fine seta:'. This 

 circular space becomes later a hole on the pupariinn-case which allows 

 the respiratory tube of the contained pupa to project outward. 



(8) A. Weismann loc. cit. p. 205. 



