NO. 2130. NORTH AMERICA RHAPHIDOPHORINAE—CAUDELL. 669 



unarmed above, beneath with three pairs of moderate sized spines in 

 addition to the apical ones ; middle tibiae armed above with two or 

 three spines on each side, beneath as in the anterior ones; hind tibiae 

 nearly straight in both sexes, very shghtly curved in the male, the 

 dorsal spurs decidedly shorter than the tibial depths, the interspural 

 serrations acute and seldom less than five between each pair of spurs; 

 dorsal apical calcar on the inner side about twice as long as the apical 

 dorsal spur, distinctly longer than the tibial depth, on the outer side 

 not so long as on the inner side; median apical calcar shghtly longer 

 and considerably thinner than the ventral one, about the same size 

 and length as the apical dorsal spur; beneath the hind tibiae are 

 armed with thi-ee mesially located spines and usually a horizontal 

 subapical pair, all on the apical hah of the tibia; in the male there 

 is a noticeable subbasal hump beneath the hind tibiae as illustrated 

 in the figure of the posterior leg of CeuthopMlus nodulosus (fig, 9), 

 but less prominent; all tarsi with the second segment short, barely 

 or no longer than deep, a little more than twice as long as the third 

 segment. 



Color shining yellowish brown, shghtly darker above, especially 

 on the abdomen. 



Length, both sexes, pronotum, 3.75 mm, ; fore femora, 4 mm. ; hind 

 femora, 9.5 mm,; ovipositor, 3,75 mm,; width, hind femora at widest 

 point, 3 mm, 



Holotype.—'M.alQ, Queen, New Mexico, November 7, 1914. E. G. 

 Holt, collector; allotype and paratype, female, same data as the 

 holotype. 



Holotype and allotype in United States National Museum. Cata- 

 logue No. 19413. Paratype in collection of Morgan Hebard in Phila- 

 delphia. 



This species is structurally closely aUied to CeuthopMlus nodulosus 

 but superficially scarcely at all resembles that species. The smaller 

 size, the apparently more compact form, and the nearly straight 

 posterior tibiae of the male will serve to distinguish this new species 

 from nodulosus. In nodulosus also the ventral spines of the hind 

 tibiae are situated on more prominently elevated tubercles than in 

 genitalis and the subbasal ventral hump is somewhat more prominent. 



The short stout form and shining color of genitalis together with "the 

 short legs remind one of some species of PTirixocnemis and the short 

 second segment of the tarsi shows a relationship with that genus. 



If it were the accepted custom to base genera on purely secondary 

 sexual characters, nodulosus and genitalis would deserve separation 

 from CeuthopMlus, for the males of those species are certainly anoma- 

 lous for that genus. 



