52 
The main function of the Diptera in the interesting struggle which 
we have described was that of scavengers. The scavenger flies were 
much more abundant than the parasitic flics, and the dead bodies of the 
caterpillars, the chrysalis skins, and the remains of the different species 
of parasites were abundantly preyed upon by species of this class. 
The table which follows shows the exact host relations of the Ilymen- 
optera reared in the course of the observations: 
Tabic showing host relations of the Hymenopterous parasites so fur as they are known 
or surmised. 
Host, i )r.i:yia liurostigma. , 
Primary parasite 
ondary parasit< 
Tertiary parasite. 
Possible quater- 
nary. 
Pimpla inquisitor. 
Pimpla annulipea 
Pimpla conquisitor 
Ichueumon cceruleus . . . 
Ichneumon Bubcyaneus. 
Amorphotaorgyia- 
Dibrachya bouebeanus Asecodea nlbitarsis. - . 
Allocota tbyridopterigia Habrocytus thyr. !.... 
Bathythrix pimplas Dibrachya boucheanua 
Adiastola americana 
Allocota thyridopterigit 
Habrocytus tbyr. 
Meteorut 
■omnium- 
Bleteorus byphantria 
Limneria sp 
Limneria valida 
Spiloohalcis debilia Dibraohy 
nua ' 
Dibrachya boucheanua Asecodea albitarais. 
Spilochalcia debilia 
( )tac\isti's periliti I 
Bathythrix nieteori 
Dibrachya bouoheanua 
Spilochalcia debilia Rupelmus limneria' . 
Otacustea periliti 
Dibracln a boucheanua 
bouchea- Asecodea albil 
sis 
Theronia fulvescena - . 
Apantelea byphantria- 
Apantelea delical 
Dibrachys boucheanua Tetra 
Eupelmua limneria' 
ElasmuH atratua 
icL 
ap 
< lhalcia ovata 
I'iciomaliis cuproideus 
( Iratotecbua orevise 
Spilochalcia debilia 
I tibraohya boucheanua 
Plasmas' atratua 
Spilochalcia debilia 
Dibrachya boucheanua 
Elaamna atratua 
Telenomus orgj ise 
Elaohistus cacceciae - 
Tetrastichus sp. '. . . 
Dibrachya bouch. ' . . 
Asecodea albitarsia '. 
Asecodea albitar- 
As far as we were able to ascertain, the dipterous parasites had no 
hyperparasites. It will be seen that there were seventeen species of 
primary Hymeuoptera and six of primary Diptera. Of the secondary 
liymenopterous parasites there were thirteen species, several of them, 
however, affecting more than one species of primary parasite. There 
were but two species of tertiary parasite, so far as positive observations 
go, but three other species were strongly suspected to sustain this rela- 
tion, while, as indicated, one of the species of which we have proof of 
tertiary parasitism may under certain conditions, in our opinion, prove 
to be a quaternary parasite. In the table those species followed by an 
interrogation point are problematically placed. The parasitism indi- 
cated is strongly suspected, but has not been definitely proved. The 
placing of all of the other species is based upon exact observations. 
