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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



of the species, as is usually the case in tropical waters, are very small, 

 so that even sorting the specimens into the different kinds proves to 

 he a long and somewhat tedious process, but enough has already 

 been accomplished to show that many additional new forms have been 

 discovered, and that the range of many species has been greatly 

 extended. Some of the species were found to be very vividly and 

 beautifully colored, while the coloration of others seemed to be of 

 a protective nature, exactly matching their surroundings. 



In order to escape their principal enemy, the fish, amphipods avail 



Fig. ioi. — Bush Key Reef. The abundant marine algae at the edge of 

 this reef afford protection to innumerable amphipods and isopods. (Photo- 

 graph by Shoemaker.) 



themselves of the shelter of old coral-rocks which have been tunneled 

 and bored by other marine organisms. The cavities in sponges and 

 the interstices of algae also afford them the necessary protection. 

 Each of these locations yielded inany specimens which when finally 

 identified will, with those already known to occtir, probably be an 

 almost complete list of the species inhabiting the waters of the 

 Tortugas. 



ENTOMOLOGICAL TRIP TO GUATEMALA 



Dr. J. M. Aldrich, associate curator, division of insects, U. S. 

 National INIuseum, went to Guatemala for the purpose of increasing 



