1912.] NATURAL SCIENCES OF PHILADELPHIA. 233 



Remarks. — No specimens of this species are available for study. 

 We have included the species to make our study of the genus com- 

 plete for the forms found north of Panama. 



Genus LIPHOPLUS Saussure. 

 1877. Liphoplus Saussure, Melang. Orth., II, pp. 456, 483. 



Genotype (selected by Kirby) : Liphoplus novarce Saussure. 



We do not feel positive that the following species is really a member 

 of the genus Liphoplus, which elsewhere is found only in the Poly- 

 nesian, Indian and Malagasian regions. However, as the original 

 description specifically agrees with most of the generic characters 

 which Saussure gave as diagnostic of his genus, we have no alternative, 

 in the absence of material, but to retain it in Liphoplus. No mention 

 is made of the absence of a tympanum on the cephalic face of the 

 cephalic tibiae, which absence is considered an important generic 

 character in the original description of the genus, but this omission 

 is rather discounted by the figure which shows no tympanum, thus 

 agreeing with true Liphoplus. The interantennal protuberance is 

 described and figured as distinctly divided. 



Generic Description. — "Body pubescent, the females apterous, the 

 males supplied with tegmina. Head as in Arachnocephalus, showing 

 a protuberance divided by a sulcus. 



"Pronotum in the males produced posteriorly over the metanotum, 

 as in Ectatoderus, the caudal margin arcuate; less produced in the 

 females. Anterior tibiae having the internal faces supplied with a 

 small tambourine. Tegmina of males short, membranous, supplied 

 with a complete tambourine, but sometimes more or less obsolete. 



"This genus is to us but imperfectly known. The body is very 

 pubescent, but we presume that it should be likewise more or 

 less scaled in fresh and well-preserved individuals. The elytra of 

 the males show in their tambourines certain analogies to those of the 

 Phalangopsini, the first vein being angulate. 



"Liphoplus differs from Arachnocephalus in the anterior tibiae being 

 furnished with a tambourine, and in their winged males; from 

 Ectatoderus in their facial protuberance being distinctly divided." 



Distribution in North America. — State of Guerrero, Mexico. 



Liphoplus mexicanus Saussure. 



1897. Liphoplus mexicanus Saussure, Biol. Cent. Amer., Orth., I, p. 231, pi. 

 XI, fig.*37. [Amula, Guerrero, Mexico.] 



Type: c?; Amula, Guerrero, Mexico, elevation 6,000 feet. 

 (H. H. Smith.) [Biologia Collection in British Museum.] 



Description of Type. — "Rufo-testaceous, depressed. Antennae of 

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