54 



ENTOMOLOGICAL SOCIETY OF ONTARIO. 



Attracted, by the aphides, and the honey-dew which they ejected, innumerable 

 two-winged flies buzzed daily about my beans. On one occasion I counted fifteen 

 different sorts. Conspicuous amongst them were, Eristalis tenax, Linn, the Drone Fly 

 (so called from its resemblance to the male of the honey bee); a pretty black and 

 yellow Syrphus Fly, Eristalis transversus, Wiedeman ; Volucella ereda, Walker, easily 

 distinguished by the brown patch in its wings; Tachina vivida, Harris, a bustling showy- 

 insect with a large orange-red abdomen set with black bristles ; the Flesh Fly, Sarcophaga 



Fig. 37. 



xarnaria Linn, Fig. 37, (highly magnified,) large, red-eyed, with striped thorax and 

 mottled abdomen — grey and black ; the Green-bottle Fly, Musca Ccesar, Linn; the Blue- 

 bottle Fly. 31. vomttoria Linn, and a species of Scatopliaga. 



Less abundant as regards individuals, but more numerous in point of species 

 were the Hymenopterous insects that frequented that row of beans. The following 

 is a list of twenty difi'erent kinds of them captured during the month of September 

 with the cyanide bottle only : 



^■Edynerus tigris, Saussure. /. jiicundus, Brulle. 



Philantlms bilunatus, Say. /. ci'eperus, Cress. 



Crabro singularis. Pack. /. 2Jaratus, Say. 



Monedula ventralis, Say. Tragus Copei, Cress. 



Apldlanthrops frigidus. Smith. Amblyteles indistinctus, Prov. 



Pompilus atrox, Dahlbom. Opio7i purgatum, Say. 



Hedijchrvm violaceum, Lepell. Opheletes glaucopterus, Linn. 



Ichneumon comes, Cresson. Bassus leatatorius, Fab. 



/. hetus, Brulle. Pimpla pedalis, Cress. 



/. Jlavizonatus, Cress. Sampronota Americana. Cress. 



A few words on 



Internal Parasites. 



The lowest types of these with which we are acquainted are the Gregarinidfe 

 "which are found in earth worms and other annulids. The gregarina of the earth- 

 worm consists of a transparent capsule filled with a colorless, semi-fluid, granulated 

 mass, in one part of which a well-defined nucleus appears. The creature has no 

 digestive apparatus — it lives by absorption of fluids through the capsule. When two 



