292 Scientific Intelligence. 
spells of activity were occasioned by the presence of a female insect about 
yellow except the head and wings, while the male has, in addition, con- 
siderable black upon the back. 
were visible—the pulsating dorsal vessel, the intestine, the tracheary or 
breathing system, the mandibles, the feet, ete.; and the animal moved 
in its nidus, On the fourth day the em ryo escaped from the egg and 
began to eat. This is the most rapid embryonic development I have 
ever witnessed. é 
When the larve first eseapes, it is whitish, and one-tenth of an inch 
in length. It beeomes one-third larger in twenty-four hours, and attains 
full growth by the 25th of June. The brood then begins to moult and 
descend into the soil as before. In this situation it probably remains 
until the succeeding spring. 
he following is then a summary of its history: : 
May 17th, first brood of flies appear from larves or worms which went 
into the soil the previous summer. May 2ist, first brood of larves, be 
coming noticeable about May 23d. June 3d, moulting and burrowing 
in progress. June 16th, appearance of second brood of flies. June 20th, 
second brood of larves escaping from egg. June 25th, flies disappear. 
June 28th, moulting and burrowing of second brood. 
Incubation of ovum three or four days; time to moulting and burrow- 
life-time of fly 
ing eight days; time in burrow, first brood, thirteen days; 
nine days. 
- 
orilla—Dr. Avzoux 
