EUPLECTINI 89 



Pronotum as in falli with deep entire longitudinal and transverse sulci and 

 deeply incised lateral margins. 



Elytra as in falli save that dorsal stria is subentire, extending to apical 

 ninth. 



Abdomen with five visible tergites, first four subequally long, the fifth 

 shorter with broadly rounded apex; tergites simple; margins strong. 



Seven stemites, the first four subequal in length, evenly and minutely gran- 

 ulate; fifth half as long as fourth, medianly and transversely tumid with tumid 

 region glabrous; sixth semicircular, enclosed by fifth, as long as fourth and 

 transversely foveate for apical third, with basal margin of foveation elevated 

 and densely pubescent, these setae recurved toward base of segment ; seventh 

 enclosed by sixth, obliquely divided into a right and left triangular plate. 



Middle coxae contiguous; metasternum relatively short, as long as fourth 

 and fifth stemites united, not sulcate but medianly depressed at apex; posterior 

 coxae approximate. Femora simple; tibiae thick, especially the anterior pair 

 which are medianly inflated, very slightly contorted near base and excavated 

 apically ; tarsi as in falli. 



Described on one male collected by Mr. Dybas, for whom this important 

 addition is named, on July 13, 1941, at San Juan, Vera Cruz, Mexico. The im- 

 portance of dybasi is zoogeographic. In structure dybasi shows definite affinities 

 with the genotype bistriatus of the southern United States, as well as the South 

 American species; it serv^es to bridge the gap which existed, no members of the 

 genus having been reported previously between Brazil and the United States. 

 Species are to be expected from Central America if northward spread from a 

 postulated Brazilian center is tenable. 



The species of Rhinoscepsis are as follows: 



falli new species. Brazil. 



gracilis (Schaufuss). 1872. Brazil. (Panaphantus) 



militaris (Schaufuss). 1872. Brazil. [Panaphantus) 



pubescens (Raffray). 1898. Brazil. (Rhynoscepsis) 



richteri (Raffray). 1908. Argentina. (Rhynoscepsis) 



dybasi new species. Vera Cruz, Mexico. 



THESIUM (Casey, 1884) 



Casey (1884, 1893, 1908) 



Sharp (1887) (Apothinus) 



Brendel and Wickham (1890) 



Raffray (1898, 1903, 1908) (Apothinus) 



Leng (1920) 



Bowman (1934) (Thesium cavifrons (LeConte) genotype, p. 144) 



Of the nine known species of this genus, two are found north of the Rio 

 Grande river (including the genotype), one from Brazil, and six from what 

 appears to be the center of distribution. Central America. The genus, then, is 

 wholly American and extends from the Amazon basin through the Isthmus of 



