8 



The egg-laying habits and the life history of the "Ugi" 

 (Ugimya sericanae Rondani) were published in detail by 

 Sasaki, in Journ. Sei. Coll. Imp. Univ. Japan, 1886. The 

 eggs are laid on mulberry leaves, eaten by the silk worms ; hatch 

 in the digestive canal in a few hours ; the larvae bore thru 

 its walls, feed on the ganglia for a time ; later enter the tracheal 

 system and become located in a sort of cup or sac, with the 

 spiracles at the posterior end near a spiracle of the caterpillar 

 and the anterior end with the body cavity where it is convenient 

 to feed on the fat of the silkworm; when fully developed the 

 maggot forces its way out thru the skin of the silkworm (or 

 pupa, if it has pupated) ; enters the ground to form its pupa- 

 rium, within which it remains thru the winter. 



Chaetogaedia monticola agrees with this in some parts of its 

 development. The eggs are laid on leaves as before stated. The 

 egg of Chaetogaedia appears as a tiny black dot on a grass leaf. 

 It is .44mm. long by .25mm. broad, quite regularly ovate, shaped 

 like a hen's egg only somewhat flattened where in contact with 

 the leaf; smooth and shining black. A female dissected was 

 found to have several hundred of them in the ovarian tubes. 

 Another female which bred out in captivity, was dissected when 

 several days old, to count the eggs. The oviduct contained 

 1066 eggs which were black and apparently ready for oviposi- 

 tion. The ovarian tubes, Avhich are numerous and collected 

 into two ball-like structures, were full of immature ova. Prob- 

 ably the mapority that are laid are not eaten by caterpillars; 

 hence, the provision of such a large number is to insure some of 

 them being eaten. They are so small as to escape being injured 

 by the jaws of the caterpillars in biting off bits of leaf, tho 

 probably some are destroyed. They soon hatch in the alimen- 

 tary canal of the caterpillar and bore thru its walls to the sur- 

 rounding body cavity. If they did not hatch the same day they 

 would probably pass out with the excrement. A caterpillar 

 which had been fed with leaves on which quite a number of 

 Chaetogaedia eggs (dissected from a caught female) had been 

 spread, died after 5 days. It was dissected and 24 maggots of 

 the parasite were found inside. They were about 2mm. long 

 and were mostly located in the head and anterior segments of 

 the caterpillar. Other caterpillars which had been similarly 

 treated and had died, were dissected and fewer maffffots found 



