554 PROCEEDINGS OP THE AMERICAN ACADEMY. 



median minute groups of 4-5 minute short setae, and two rounded 

 lateral small tubercles. The tubercles of the 2d thoracic segment are 

 smaller titan those on the 3d, the latter not being so high and prominent 

 as those on the 1st abdominal segment ; those on the thoracic segments 

 are flattened, button-like, not so high as thick ; all orange-yellow, and 

 bearing from 4 to 7 short black stout setae, the longest ones no longer 

 than the tubercle is high. 



The tubercles on abdominal segments 2-7 are smaller than those on 

 the 1st abdominal segment, and gradually become smaller towards the 

 7th segment. The setae in general are a little longer than the tubercles 

 are high. 



The median tubercle on the 8th segment is low, not so high as broad, 

 and in outline seen from above is transversely oval, bearing 4 principal 

 larger setae and three minute ones besides. (The originally double 

 origin of the tubercle is not evident.) 



There are on the 9th abdominal segment very minute green vestiges 

 of two tubercles. 



Suranal plate green, with a conspicuous white stripe on the edge, and 

 on top of the plate is a subtriaugular black mark made by a narrow 

 black line, and a triangular black ring on the outside of the anal legs. 



Front edge of abdominal segments 8-7 with a broad, conspicuous 

 pale purple-madder stripe, which is widest beloiv and narrow above; this 

 is succeeded by a white band, widening dorsally and conspicuous ivhen 

 seen from above. Spiracles yellow ochre. Thoracic legs green, irregu- 

 larly ringed with black, the tips black ; the four pairs of mid-abdominal 

 legs black-brown, with an external conspicuous yell owisli -green patch, 

 and armed with rather loug curved setae. The plantae of the anal 

 legs black -brown. 



Cocoon. — On the morning of June 13 my larva, which was a little 

 under the normal size, had begun to spin a cocoon, and the handle or 

 stem of the cocoon had been spun before it was nearly finished ; the 

 rather large opening for the exit of the moth bad been left open. 



Number of moults and habits. — There are four castings of the skin 

 and five stages, as usual in the bombycine moths, and the family Satur- 

 niidae. In captivity in a northern State (New York and afterwards 

 Rhode Island), the ecdyses occurred at about every ten days, the eggs 

 being laid near the end of April aud the larvae hatching out the first 

 of May. 



Food plant. — The larvae were fed on the ash and wild cherry, but 

 preferred the latter. Its native food-plant is unknown to us. 



