BARBOUR AND COLE : PISCES FROM YUCATAN. 159 



in. the tanks containing these fishes mosquito larvae were entirely absent, 

 whereas in the tanks without fishes larvae were exceedingly abundant. The 

 fact that these fishes live so well in small bodies of water offers the suggestion 

 that they may prove of practical value in aiding to subdue the mosquito pest 

 in Yucatan." 



This species has apparently been known thus far only from three specimens 

 taken in Lake Peten by Salvin and Godman. 



38. Balistes carolinensis Gmelin. 

 One specimen from the Gulf of Mexico at Progreso. 



39. Lagocephalus pachycephalus (Ranzani). 

 Three specimens from the Gulf of Mexico at Progreso. 



40. Lagocephalus laevigatus (Linne). 

 Two specimens from the Gulf of Mexico at Progreso. 



41. Opsanus tau (Linne). 

 One specimen from Gulf of Mexico at Progreso. 



42. Opsanus pardus (Goode & Bean). 

 Three specimens from Progreso, Gulf of Mexico. 



43. Emblemaria atlantica Jordan & Evermann. 

 One specimen from La Cienaga near Progreso. 



44. Echeneis naucrateoides Zuiew. 



Two specimens from the Gulf of Mexico at Progreso. 



One specimen with but 18 laminae in the disc, the other has 20. Jordan 

 and Evermann (Fishes of North and Middle America, p. 2270) give 20 or 21 

 as the characteristic specific number*. 



45. Ogcocephalus vespertilio (Linne). 

 One young specimen from the Gulf of Mexico at Progreso. 



