no. 3616 GENUS EUPARIXIA — WOODRUFF AND CARTWRIGHT 11 



fourth to the epipleuron of the elytron; median area slightly more 

 depressed anteriorly and roughened by close, fine to moderate punc- 

 tures. Mesosternum and metasternum separated by a fine transverse 

 carina that sometimes has a median longitudinal carina extending a 

 short distance anteriorly and posteriorly. The latter carina gives 

 way quickly to a long, coarse, deep, median line or sulcus. The 

 bordering carina around posterior end of middle coxa becomes very 

 noticeably heavier and separated from disc of metasternum by a 

 coarse deep punctate sulcus; remainder of disc alutaceous and with 

 fine to moderate, close punctures outward from midline; depressed 

 area in front of posterior coxae alutaceous, the arcuate anterior margin 

 deep and sharply bordered; sides scabrous outward and forward 

 between coxa and epipleuron. 



Abdomen: Each abdominal sternite depressed on anterior one-half; 

 this depression with longitudinal ridges irregularly spaced. The 

 posterior one-half of each sternite coarsely, irregularly punctate. 

 Pygidium nearly concealed, a transverse depression paralleling the 

 apical border and a longitudinal depression in middle, reaching to 

 transverse depression. 



Legs: Anterior tibiae tridentate; apical tooth broad, bent outward 

 at nearly right angle to tibia. Apical spur elongate, narrow, slightly 

 longer than combined length of first three tarsal segments. Anterior 

 trochanter large, prominent, impunctate, rugose ventrally. Anterior 

 femoral groove and about one-half the dorsal surface of femur covered 

 with fine, short, golden setae. Posterior femur with marginal groove 

 covering one-half the length from the apex. Terminal spurs of middle 

 and posterior tibiae unequal: the longer one is four-fifths the length 

 of the first tarsal segment; shorter spur two-thirds the length of the 

 longer one. Middle and posterior tibiae nearly straight, narrow, 

 slightly curving outward toward the weakly expanded apex. First 

 segment of middle and posterior tarsi equal in length to next three 

 segments combined. 



Diagnosis: This species, the type of the genus, differs from all 

 known species in the shape of the pronotal outline (fig. 2). The 

 basal constriction is less extensive, creating a broader explanate margin 

 than in any other species. The angle formed at the constriction 

 more acute. It differs further in its distribution and, although its 

 host ant is not known, probably differs in this respect also. It is 

 the most common species in collections and with E. moseri, new 

 species, comprises the only two species in the United States. 



Specimens examined: Forty-one from the following localities: Arizona: 

 1-Globe, 20-VII-33, F. H. Parker, Lot 3, from O. Bryant Colin., Topotype 

 [CAS]; 2-Globe, VIII, Duncan and Parker, R. Hopping Colin. [CAS]; 1-Globe, 

 VIII, Duncan and Parker [UK]; 1-Globe, 15-VII-27, Duncan and Parker, 



