1924] 
The Biology of Trichopoda pennipes Fah! 
13 
interest displayed by the victim, which neither resisted the 
attack of the fly nor tried to dislodge the egg. 
Relation Between Paeasite and Host. 
Various observers have noted the parasitic habit of Tricho- 
poda pennipes and have speculated upon the amount of benefit 
derived from its activities. Thus Dr. A. S. Packard (1875) 
says, ‘^The larvae are very large, one specimen only occurring 
in the body of the Coreus, which seems apparently healthy, 
and performs its sexual functions in spite of the presence of so 
large a parasite.” Chittenden (1899) observes that ‘‘Although 
these flies appeared soon after the advent of the bugs and in 
considerable abundance, they seemed to accomplish little in the 
direction of reducing the numbers of their host. — The parasitized 
individuals were not noticed to die much earlier than those 
which succumbed to natural causes.” Weed and Conradi (1902) 
/^f)Y JUfiE JUL Y 
fiUC-UiJ 
sepeembep 
OCTOBER 
hTS 
— '• •• 1 1 
ei^ncktifiQ adJt b-''^ ■ — 
■■ 1 1 
1 [ — ' 
— = odvit bugs 
1 1 1 
1 1 
n^mpbs 
— 
Seasonal HiSfoty of 
1 1 
’Vcnye aduJt bi/qs 
Bnasa tnstis 
^ ^ 1 
1 1 
— = ting adult bugs 
1 ~r ■= 
larx'ite ify odi,lt bi/gs 
pupoe /f) sei/ 
Qdv/f 
/art'oe odu/t 
Seatano! of j /D*//oae in soU 
Tr/chopoda pe^mpes q <?■>/<■ ///£»5 
/ofyae /ostaf n<)mpf)S ratfu/t bugs 
Fig. 1. Relation of Trichopoda pennipes to its host, Anasa tristis, Amherst, Massa- 
chusetts, 1922. Worthley (1923). 
also mention the continued egg-laying of parasitized squash 
bugs. Drake (1920) in his notes on T. pennipes as a parasite of 
the Southern Green Stink-bug mentions percentages of parasitism 
ranging from 31 to 80 per cent. 
