lo HYMENOPTERA. 



It is parasitic on the larva of Tremex Colurnba Linn., 

 a wood boring insect. 



Ophion macrurum Linn.— This species is parasitic 

 on the larva of Telea Polyphemus Linn. Its large 

 brown cocoons are found singly within the cocoons of 

 this silkworm. 



Cryptus nuncius Say is a smaller Ichneumon-fly of 

 which thirty-five specimens were bred from a single 

 cocoon of T. Polyphemus. 



Mzcrog^aster. — Fech\e caterpillars may often be seen 

 crawling about with many, from fifty to two hundred, 

 little white or yellow cocoons attached to their bodies ; 

 these cocoons are also found attached in clusters to 

 plants upon which the caterpillars live. They are the 

 cocoons of small Ichneumons which leave the body of 

 their victim to undergo their metamorphoses. Many 

 of these Ichneumons belong to the genus Micron-as- 

 ter. 



ProctotrvpiD/E {Egg-parasites). 

 This family will not be discussed in this course. 



Chalcidid/E {Chalcis-flies). 



The species of this family are of small size, and of 

 bright metallic colors. Their habits are similar to 

 those of the Ichneumon-flies, they being like them 

 parasitic on the young of other insects. They differ, 

 however, from the Ichneumon-flies in this particular, — 

 the majority of Chalcis flics do not spin a cocoon, but 

 have naked pupae. 



Pteromalus pjiparum Linn, is parasitic on the chrys- 

 alides of the cabbage butterfly, Pieris rapa: Linn. 



Antigastcr mirabilis Walsh is parasitic on the eggs 



