6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



and Cook (1953) record this ant from southern Arizona, Mojave 

 Desert, and Yucca, Calif., and the type-locality is Calamajuit, Baja 

 California, Mexico. There is a disjunct subspecies, A. v. chicosensis 

 (Wheeler), which is recorded from the mountains of the Big Bend 

 area of Texas. 



Jones (1917) reported the first record of A. texana in Louisiana 

 in 1914, but local residents stated these ants had been there for a 

 long time. Smith (1939) also believed that this species was not 

 introduced recently into Louisiana, but "owing to the fact that it 

 is found largely on non-farming areas or wastelands, it has previously 

 escaped much attention." Smith (1951, p. 832) stated that it had 

 been found in "much of western Louisiana and eastern Texas between 

 the 92d and 101st degrees of longitude but not uniformly distributed 

 in Louisiana at least." The distribution shown on the map (fig. 1) 

 has been derived from Smith (1963) and Moser (in litt.). 



A. mexicana has been recorded only recently from the United 

 States (Byars, 1949, and Smith, 1951), in the Organ Pipe National 

 Monument of Arizona about five miles north of the Mexican 

 boundary. 



Genus Euparixia Brown 



This monobasic genus is characterized among the Eupariini by 

 the inflexed clypeal margins, explanate pronotal margins, basally 

 constricted pronotal sides, cariniform elytral intervals (except in 

 E. costaricensis) , epipleurae covering external tips of middle coxae, 

 middle coxae widely separated, mesosternum expanding laterally 

 to partly cover the anterior half of the middle coxae, the mesosternum 

 separated from the metasternum by a transverse carina, long slender 

 middle and posterior tarsi, and a peculiar arrangement of terminal 

 fimbriae of the posterior tibiae (fig. 9). The terminal outside edge 

 of the tibia is excavated slightly or emarginate opposite the first 

 tarsal segment, with the spurs and one seta on one side of the emar- 

 gination and a group of three setae on the other side, an arrangement 

 also found in Euparixoides. 



In general facies and clypeal characters, Euparixia is most similar 

 to Euparixoides; however, this latter monotypic genus has pronotum 

 laterally and basally, and clypeus anteriorly, noticeably crenate. 

 It has a basally impressed pronotal midline, normally convex elytral 

 intervals, a single terminal spur on middle and posterior tibiae (fig. 12), 

 and middle and hind legs with short, tapering tarsi about half the 

 length of the tibiae. The crenate anterior clypeal margin in Eupari- 

 xoides is unique in the Aphodiinae so far as we know. 



Euparixia in many respects is also quite close to Cartwrightia 

 even though the latter has more of the appearance of Ryparus. Eu- 



