92 Journal New York Entomological Society. [Voi. xii. 



a barred area as usual and there is no perceptible dorsal plate. The 

 head is slightly elongated, very pale brown, the antennae rather short, 

 weak, the small tuft in the middle (Plate III, Fig. 5). The protho- 

 racic hairs are much reduced. Air tube moderate, about two and a half 

 times as long as wide, weakly infuscated, the pecten teeth (Plate III, 

 Fig. 6) followed by a single hair tuft at about the middle. Lateral 

 comb of rather few spines (Plate III, Fig. 8) in an irregular double 

 row, the single spines somewhat sole-shaped and fringed to the apex 

 (Plate III, Fig. 9). Anal processes very long, cylindrical, sack-like, 

 rounded at the end, rather opaquely whitish, with numerous elliptical 

 spots in which the branches of the tracheae seem 'to terminate. Dorsal 

 tuft and ventral brush much alike in appearance ; also a single lateral 

 hair. 



The pupa has the usual appearance. 



EXPLANATION OF PLATE III. 



Fig. I. Egg of Cidex varipalpiis Coq. 



Fig. 2. Stage I of the same. 



Fig. 3. Single tootii of the lateral comb of the eighth segment, stage I. 



Fig. 4. Diagram of the anal segment, stage II, showing dorsal and ventral tufts. 



Fig. 5. Stage IV. 



Fig. 6. Single tooth of the pecten of the air tube. 



Fig. 7. Labial plate. 



Fig. 8. Lateral comb of the eighth segment. 



Fig. 9. Single tooth of the lateral comb. 



Class I, Hexapoda. 



Order V, LEPIDOPTERA. 



SOUND PRODUCED BY A JAPANESE 

 SATURNIAN CATERPILLAR. 



By a. S. Packard, M.D., 



Providence, R. I. 



While rearing from the eggs a number of the larva of the Japanese 

 Saturnian moth, Rhodia fiigax, Mr. Joutel observed, as he kindly in- 

 forms me that the larva in its last stage " makes a squeaking noise by 



