66 



ARTHROPODA 



PIG. 54. One of the many adult 

 insects that came from the cocoons 

 shown in Fig. 53. Enlarged six times. 



FIG. 55. Photograph of Ophion. Nat- 

 ural size. 



worm upon which its cocoons may be seen in late summer 

 or autumn. A simi- 

 lar species is para- 

 sitic in the larva of 

 the hawk moth feed- 

 ing on the leaves of 

 the Catalpa tree in 

 September. Ophion 

 and Trogon are two 

 of the large forms 

 often issuing from 

 the cocoons of the 

 swallowtail butter- 

 flies. Thalessa is 

 distinguished by its 

 long ovipositor used 

 in depositing eggs an inch or two within a tree where 



FIG. 56. Photograph of Thalessa; o t the ovi- 

 positor equal in length with the two supports 

 was inserted two inches in an ash tree, and was 

 broken in the attempt to remove it. 



