ILLUSTRATIONS 



PLATES 



Plate I. Hymenopterous Larvae. 



1. Crcesus latitarsus Nort., on birch. 



2. Giant Sawfly, Cimhex americana Leach. 



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



Say, feeding on willow. 



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



5. Peach Sawfly, Pamphilius persicus MacG. 



Plate IL 



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



Linn. 



2. Nest of Common Wasp, Polistes pallipes LePel. 

 Plate IIL 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 VL 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 roscB Linn, 



Plate VH. 



1. Cocoons of Apanteles (Protapanteles) congregates 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 VHL 



1. Peach Sawfly, Pamphilius persicus MacG. 



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



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



4. Elis quinquecincta Fabr. 



5. Potter Wasp, Eumenes fraterna Say. 



6. Giant Sawfly, Cimbex americana Leach. 



6 



