JUAN VI N AS—THE REFENTAZON VALLEY 221 



black except for the cross-band of white just mentioned. 

 The creature looked almost as if made of variously colored 

 plush and the colors themselves entitled it to be seriously 

 considered as a national German caterpillar — if it had lived 

 in Deutschland. It walked or crawled not continuously 

 as most caterpillars do, but by jerks, with an appreciable 

 stop after each forward jerk. There was a tuft of black 

 scales at the hind end of the body; at the conclusion of one 

 jerk this tuft was up, at the conclusion of the next it was 

 down, so that the progression of this insect was not unlike 

 that of a mechanical toy which is but partly wound up. 

 We kept this caterpillar alive for several days, chiefly in 

 a little wooden match box. On July 3 I had it out on the 

 table while writing these notes and measured its rate of speed 

 over a sheet of paper. In one minute it traveled 18 cm. 

 (7.2 inches). It belonged to the family Eupterotidae. 



On one of the boulders on the bank of the Reventazon 

 on March 20 was a caterpillar which had probably dropped 

 from a tree overhead. It was not quite an inch long and its 

 upper surface was generally gray. From each side of the 

 body projected three somewhat twisted flat extensions, 

 each nearly half an inch long and an eighth wide. Each 

 one of these extensions was truly a part of the body and was 

 covered with short hairs forming a dense pile. The middle 

 of the upper surface was also covered with a short dense pile 

 of darker blackish hairs. The head of the caterpillar was 

 reddish-brown. When I first saw it I thought it was some 

 sort of bag-worm and that the three extensions of each side 

 were pieces of dry withered leaves which the insect had 

 attached to its bag. Its legs were short as in the slug cater- 

 pillars (Limacodid^ or Cochliidse) to which this species no 

 doubt belongs.^ This description is less accurate than I 



^ Our description of this caterpillar and its cocoon suggests the curious North 

 American species Phobetron pithecium. The moth which emerged from the cocoon 



