INDUSTRIAL PROGRESS DURING THE YEAR 1873. xcix 



and the reports of Mr. T. Glover in the monthly agricultural 

 reports. The largest general work that has appeared is a 

 quarto volume on the Grasshoppers {Acrydii)^ by Rev. Cyrus 

 Thomas, forming a part of the volume on Zoology of Hay- 

 den's " Geological Survey of the Territories." The first work 

 on insects printed in California is a credit to California sci- 

 ence. It is a serial work on California Moths, by Mr. Stretch, 

 illustrated by plates executed in San Francisco. Many new 

 Coleoptera and systematic notices of different families have 

 been published by Drs. Le Conte and Home, and Mr. Crotch. 

 The Mexican Ichneumons have been described by Mr. Cres- 

 son, and new moths described by Messrs. Grote and Packard. 

 A work of great practical use, especially to those situated away 

 from scientific libraries, is an "Annual Record of Progress in 

 Entomology in America," published by the Peabody Acad- 

 emy of Science, and sustained by the leading entomologists 

 of the United States. It contains all the references to pa- 

 pers and notes relating in any Avay to the insects of this 

 country. Important works published in Europe on the in- 

 sects of North America are Loew's description of our Dip- 

 tera, and Zeller's work on our moths, particularly those found 

 in Texas. Mr. Scudder has published an elaborate paper 

 on the fossil Myriopods of Nova Scotia discovered by Dr. 

 Dawson. The Smithsonian Institution has published a valu- 

 able pamphlet of instructions for collecting insects, prepared 

 by Dr. A. S. Packard. 



As regards the Arachnida (mites and spiders), several pa- 

 pers have appeared on the mites. M. Megnin discovers that 

 a species of Hypopus is but an immature stage of the genus 

 Tyroglyphus^ of which the sugar and cheese mites are famil- 

 iar examples. Among the eleven species of Hypopus de- 

 scribed by Dufour, he recognizes six, which he does not doubt 

 are the early stages of different mites. An important paper 

 on cave-bearing spiders and their allies has appeared from 

 the pen of M. Simon, and a fellow-countryman of his has de- 

 scribed a number of new cave beetles from Southern Europe. 



No important paper on the embryology of the higher in- 

 sects has appeared during the year. A notice of a so-called 

 "hypermetamorphosis" in a common May-fly of France {Pa- 

 lingenia virgo) has been contributed by M. Joly. He has as- 

 certained that its larva, when just hatched, has no visible 



