ILLUSTRATIONS 



PLATES 



Plate I. Hymenopterous Larvae. 



1. Crcesus latitarsus Nort., on birch. 



2. Giant Sawfly, Cimbex americana Leach. 



3. A Sawfly larva, possibly (Pteronus) Pteronidea ventrahs 



Say, feeding on willow. 



4. Tomostethus (Monophadnus) bardus Say, on ash. 



5. Peach Sawfly, Pamphilius persicus MacG. 



Plate II. 



1. Nest of White-faced Hornet (Vespa) Vespula maculata 



Linn. 



2. Nest of Common Wasp, Polistes pallipes LePel. 



Plate III. Nest of Common Yellow-jacket (Vespa) Vespula 

 diabolica Sauss. 



Plate IV. 



1. Nest of Odynerus birenimaculatus Sauss. 



2. Nest of Potter Wasp, Eumenes fraterna Say. 



3. Nest of Mud-dauber, Sceliphron cementarius Drury. 

 Plate V. Nest of Formica exsectoides Forel, a common Ant. 



Plate VI. Galls formed by Hymenopterous Insects. 



1. Blackberry Seed Gall, Diastrophus cuscutceformis O. S. 



2. Knot Gall, Diastrophus nebulosus O. S. 



3. Mealy Rose Gall, Rhodites ignotus O. S. 



4. Oak Bullet Gall, Holcaspis globulus Fitch. 



5. Mossy Rose Gall, Rhodites rosce Linn. 



Plate VII. 



1. Cocoons of Apanteles (Protapanteles) congregatus Say, 



on young Tobacco Worm. 



2. Cocoons of a Microgasterine, the host of Pezomachus 



minimus Walsh, on apple twig. 



3. Cocoons of a Microgasterine, Apanteles {Protapanteles) 



glomeratus (Linn.), a parasite of the Cabbage Worm. 

 Plate VIII. 



1. Peach Sawfly, Pamphilius persicus MacG. 



2. Pigeon Horntail, Tremex columba Linn, (female). 



3. Pigeon Horntail, Tremex columba Linn. (male). 



4. Elis quinquecincta Fabr. 



5. Potter Wasp, Eumenes fraterna Say. 



6. Giant Sawflv, Cimbex americana Leach. 



