238 Trans. Acad. Sci. of St. Lowis 
3 Parasites. 
Chalcid parasite, Monodontomerus sp. 
Cuckoo-bee, Chrysis (Tetrachrysis) 
coeruleus. 
Parasitic bee, Pseudomelecta interrwpta. 
Cow-killer or velvet ant, Dasymutilla ferrugata. 
Cow-killer or velvet ant, Sphaerophthalma scaeva. 
Cow-killer or velvet ant, Sphaerophthalma pennsyl- 
vanica. 
Parasitic Wasp, Sapyga sp. 
Parasitic Bee, Sphecodes sp. 
Parasitic Fly, Copecrypta ruficauda. 
Parasitic Fly, Archytas aterrima. 
Parasitic Fly, Sarcomacronychia trivtt- 
tata. 
Parasitic Fly, Parametopia sp. 
Parasitic Fly, Argyromoeba anale, 
Parasitic Fly, Argyromoeba oedipus. 
Parasitic Fly, Argyromoeba fur. 
Parasitic Fly. Argyromoeba tigrina. 
Parasitic Fly. Ganperdia apivora. 
Parasitic Fly. Lepidophora lemdocera. 
Parasitic beetle. Hornia minutipennis. 
It will be seen from the table that, with the exception 
of one beetle, all of the parasites belonged to the orders 
Diptera and Hymenoptera. Of the former there were 
10; of the latter, there were 8, comprising one chalcid, 
three species of cow-killers or velvet ants, one wasp and 
two species of bee which only recently phylogenetically 
speaking, have acquired parasitic habits, and one spe- 
cies of cuckoo-bee. With this appalling array it is @ 
wonder that any host can continue to exist; there is 20 
