NEW FISHES OF THE FAMILIES DACTYLOSCOPIDAE, 



MICRODESMIDAE, AND ANTENNARIIDAE 



From the West Coast of Mexico and the Galapagos Islands 



WITH A BRIEF ACCOUNT OF THE USE OF ROTENONE FISH POISONS 

 IN ICHTHYOLOGICAL COLLECTING 



(Plates 20-23) 

 George S. Meyers and Charles B. Wade 



This is the fourth of a series of papers^ on the fishes obtained by the 

 senior author while serving as ichthyologist of the 1938 Hancock Pacific 

 Expedition cruise in Eastern Pacific waters. Under the command of 

 Captain Allan Hancock, the expedition, aboard the motor cruiser 

 Velero III, sailed for the Galapagos Islands and the west coast of South 

 America January 2, 1938, and returned to the United States some two 

 and one-half months later. Although most of the collections were made 

 at the Galapagos Islands and along the coasts of Peru, Ecuador, and 

 Colombia, dredging and other stations were also established along the 

 west coasts of Mexico and Central America, where several new forms 

 were taken. (See Eraser, 1943, a, b, and c.) 



A new genus and species of the family Dactyloscopidae, Heteristius 

 jalisconis, is described in this paper, as well as three other new species of 

 the same family, Dactyloscopus elongatus, Myxodagnus sagitta, and 

 Cokeridia lactea. A new species of the family Microdesmidae, Micro- 

 desmus reidi, is described, as is a new Antennariid, Antennarius 

 ziesenhennei. 



In the list of specimens at the beginning of each description AHF 

 refers to the catalogue numbers in the ichthyological collections of the 

 Allan Hancock Foundation. All holotypes are in the collection of the 

 Allan Hancock Foundation. When there is more than one paratype, one 

 or more parat\'pes have been deposited in the collection of the Natural 

 History Museum of Stanford University, where this paper was prepared. 



The drawings were made by Pascual Ortiz. Although Mr. Ortiz has 

 caught the general appearance of the fishes very well, there are, unfor- 

 tunately, various inaccuracies in the illustrations. In those instances in 

 which the description disagrees with the drawing, the description may be 

 accepted as the more correct of the two. 



1 The previous reports of this series are all in the present volume of Allan 

 Hancock Pacific Expeditions, as follows: no, 3, 1940 (Herald: Syngnathids) ; no. 

 4, 1941 (Myers and Wade, New eels); and no. 5, 1942 (Myers and Wade: 

 Atherinids). 



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