NO. 2130. NORTH AMERICA RHAPHIDOPHORINAE—CAUDELL. 683 



New Mexico, and one male from Williams, Arizona, May 27, Barber 

 and Schwarz collectors. These female specimens show the armature 

 and structm-e of the posterior limbs to be the same as in the male, 

 except the ventral serrations of the femora are probably 

 somewhat smaller; between the dorsal spurs of the hind 

 tibiae of both sexes there are usually no serration, but 

 sometimes there is one or two, and the second segment 

 of the corresponding tarsi is shorter than deep 



Figure 23 shows the posterior tibia and tarsus of the 

 holotype. 



PHRIXOCNEMIS SOCORRENSIS Rehn. 

 PHRIXOCNEMIS FRANCISCANUS Rehn. 



These two species are apparently true PJirixocnemis, but 

 are unplaced in the key, as the types are not available for 

 study at this time. Specimens in the collections in Phila- 

 delphia show little structural differences from P. vierecM, 



Fig23 ■ 



but are smaller. pheixoc- 



PHRIXOCNEMIS SERRATA Rehn. nemis neo- 



MEXICANUS. 



The remarks on the above species also apply here. This ^nd tarsus 

 species was described in the genus UdeopsyUa, but the ab- ^.f male 

 sence of a dorsal spine on the anterior femora excludes it side! 

 from that genus. Its true generic position is clear from 

 material determined by Rehn in the collection of the Philadelphia 

 Academy of Sciences. 



PHRIXOCNEMIS, species. 



In the Hebard collection is a single male specimen of a dark-brown 

 color and with a reddish stripe above, which runs out in the key of 

 species to P. neomexicanus, but is too large, and the color is not as in 

 the known specimens of that species. The pronotum of this specimen 

 is 5 mm. long and the hind femora measures 1 1 mm. in length. The 

 locality is West Point, Nebraska, and the date May 20. It probably 

 represents a new species, but until more material is available for 

 study it is thought best to not describe it as such. 



RHACHOCNEMIS, new genus. 



This genus is allied to PJirixocnemis Scudder, but the long, close-set 

 dorsal spurs of the posterior tibiae impart a very different general 

 appearance. These spines are long and heavy, those toward the tip 

 on the inner margin being twice as long as the tibial depths at the 

 point of attachment and separated by a distance no greater than the 

 width of one of them (fig. 24). The upper apical calcar is situated 

 dorsaUy and directed upward, thus differing scarcely at all from the 

 dorsal spurs. The tarsi are typically all four segmented, but in 



