514 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Owing to the fact that the vessel was already in the Gulf, 

 very satisfactory charter-terms were arranged. 



The departments of the Museum represented on the expedi- 

 tion were : Herpetology, by Joseph R. Slevin, who was put 

 in charge of the expedition; Entomology, by Edwin P. Van 

 Duzee and Joseph C. Chamberlin; Botany, by Ivan M. John- 

 ston; Ornithology and Mammalogy, by Virgil W. Owen; 

 Paleontology, by Dr. Fred Baker. 



The Mexican government sent two representatives to accom- 

 pany the expedition. They were Sefior Francisco Contreras, 

 Jefe Del Museo Nacional de Historia Natural de Mexico, 

 and Serior Carlos Lopez, of the Estudio Geologico. These 

 gentlemen proved very agreeable additions to the personnel 

 of the party and were very helpful in many ways, particularly 

 in our relations with the officials of the various towns visited. 

 The Academy feels that cooperation in scientific work by sci- 

 entific men and institutions of the two countries will prove 

 of mutual value and interest. 



The expedition spent 87 days in the field (April 14 to July 

 9). The length of the cruise was 1,811 miles, number of 

 localities visited, 56; number of islands visited, 36; number of 

 collection stations, 96. 



The expedition was in every way very successful, and 

 large collections were made in most departments. In herpe- 

 tology 3,200 specimens were obtained. All previously re- 

 corded species save two, were secured and at least 20 new 

 species were discovered. 



Of insects, spiders, scorpions and pseudoscorpions, about 

 19,275 specimens were collected. Although the specialists 

 working up the various groups have barely begun they have 

 already found nearly a hundred new species. 



The collections in botany were very large and contain a 

 surprisingly large number of new species. In paleontology 

 and conchology large and important collections were secured. 

 In birds and mammals the collections were small; very fine 

 series of eggs of several species of birds were obtained, how- 

 ever, several of the species previously represented only poorly 

 or not at all in museums. On the whole, the expedition is 

 regarded as having been a very satisfactory one and its suc- 

 cessful accomplishment reflects much credit not only upon 



