300 



PSYCHE. 



[January, igoa 



raised dots — for the_v were not more than 

 that — began to grow at once, the red color 

 remaining in the tip of each, and the lower 

 part having almost no color at first. The 

 growth was so rapid that in five minutes after 

 leaving the shells the long thoracic tubercles 

 or "horns" had their normal size and shape, 

 and the lateral spines had appeared. The 

 setae grew dark first, then the spines, then a 

 pale red color suffused the "horn " as if it ran 

 down from the tip, which grew paler. 



The abdominal tubercles gained the normal 

 color first, in about fifteen minutes, and in an 

 hour all the tubercles, spines, feet, tips of 

 props, and mouthparts had become black. 



The development of the long tubercles was 

 very rapid and very interesting, and was 

 watched in many instances, eacli one giving 

 exactly the same details in the same order, 

 though the caterpillars differed much in the 

 time they took to eat their way out of the 

 shell. Some needing an hour, others over 

 two hours. 



Observation of another set of eggs showed 

 that the color of the thoracic setae varied, 

 some larvae having the setae all black before 

 hatching, others having only those of the first 

 segment black, the others being white. 



Literature. — Comstock and Kellogg's 

 Elements of Insect Anatomy, advertised on 

 another page, is an admirable guide to the 

 practical study of the anatomy of insects. The 

 subjects treated in detail are the external anat- 

 omy of Melanoplus and Pterostichus, the 

 internal anatom}' of Corydalis and the gen- 

 eral anatomy of the larva of Holorusia. Chap- 

 ters explanatory of technical terms, of the 

 mouthparts and venation and of inethods of 

 insect histology add everything that is 

 requisite for the beginner. We cordially 

 commend the work. 



Correction: — Page 273, col. 2, line i, 

 for Odynerus read Eumeiie^. 



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