GILL] LIFE HISTORIES OF TOADFISHES 413 
Pacific coast of Columbia. These have been referred to the genus 
Kathetostoma, typified by a New Zealand fish (K. monopterygium), 
but have not been directly compared with the typical species on 
account of the absence of specimens of the last in the U. S. National 
Museum, and they may prove to represent another genus. 
IV 
Another distinct genus—E-xrecestides—is represented by a re- 
cently described small species—or small specimen—found at Garden 
Key, one of the Tortugas. It differs from Kathetostoma by the 
peculiar sculpture of the preopercles and their aliform angles, the 
large opercles, longer anal fin, and general appearance. The only 
species, E. egregius, is only known from small specimens, a little 
more than two inches (2.3) long, “taken by Doctor Thompson on 
the reef at Garden Key.” 
Fic. 121.—Leptoscopus macropygus, a distant relation of the Uranoscopids. After 
Richardson. 
Although the Uranoscopids are so strongly marked a family, 
representatives of several others have assumed a-nearly similar 
form. Besides the Leptoscopids and Dactyloscopids, which appear 
to be most closely related to them, species of unrelated families 
manifest some resemblance ; such are the Batrachoidoid genus Thal- 
assophryne, the Scorpenoid genus Trachicephalus (or Polycaulus), 
and the Trichodontoid genera. 
III. Tue WEEVERS 
The Trachinids, or weevers, constitute another compact and 
strictly limited family readily recognized by their physiognomy. 
The body is rather elongated and quite regularly tapers from the 
pectoral region to the tail, the head is rhombiform inclining to 
cuboidal, is narrower than in the Uranoscopids, and the eyes are 
