20 Psyche [February 
In the case of Phormia regina. From one puparium, 7 females 
issued from a single hole in the lateral aspect of the 3rd segment; 
from a second, 37 males issued from 2 holes in the ventro-lateral 
aspect of segments 2 and 5; from a third 15 males issued from a single 
hole in the dorso-lateral aspect of segment 5; from four more puparia, 
of the same lot, 9 males and 18 females issued, making but a single 
exit-hole in each of the hosts. In each of the following instances 
several parasites issued in the manner stated; both sexes were present: 
(a.) 2 similar holes in a longitudinal line, dorsal aspect of 2d and 
4th segments. (b.) 3 holes, lateral aspect, 2 on one side at segments 
3 and 7, the other at segment 2 on the opposite side. (c.) 2 holes, 
lateral aspect of segment 5 and tip of the anal segment. (d.) 2 holes, 
dorsal aspect of segment 3 and dorso-lateral aspect of the anal segment. 
(e.) 2 holes in an oblique line, dorsal aspect, 5th and 7th segments. 
(f.) 1 hole, lateral aspect of segment 3. (g.) 1 hole lateral aspect 
of segment 6. (h.) 2 holes, opposite sides, lateral aspect of penulti- 
mate segment and dorso-lateral aspect of segment 7. (i.) 3 holes, 
scattered. (j.) 2 holes. (k.) 2 holes caudal end, dorsal and ven- 
tral aspects of the penultimate segment. 
With Chrysomyia, several adults issued from a single puparium 
through a single hole in the dorso-lateral aspect of the cephalic seg- 
ment; from 12 puparia of this species, there emerged 32 males and 
64 females, or an average of 8 to each; in the case of 8 of the puparia, 
but a single exit-hole was present, nearly all in the dorsal aspect of the 
3d, 4th, 5th and 8th segments; the remaining 4 hosts bore each 2 
exit-holes, usually widely separated. 
In Cynomyia cadaverina Desv., 8 oo’, 16 2 Y issued from a single 
puparium from two equal round holes in the dorso-lateral aspect of 
segments 3 and 5. 
In regard to the time of emergence, the males usually emerge from 
2 to 20 hours earlier than the females, a few emerging some hours 
previous to the simultaneous emergence of the majority, but there 
is considerable variation in individual cases. ‘Thus some males may 
be the last to emerge, but the tendency is for them to emerge earlier 
than females. 
J. Local Abundance. In order to show the local abundance of 
this parasite during 1908, we have merely to point out the fact that 
as many as eight thousand or more specimens were reared by us 
during the months of September and October. This large number 
