NO. 2130. NORTH AMERICA RHAPHIDOPHORINAE—CAUDELL. 671 



Dorsal siirface of the abdomen with, numerous stout bhmt spines and four ele- 

 vated smooth areas, some of which are higher than broad (fig. 15); cerci as in 

 figure 17 tuberculalus Caudell. 



3. Cerci as in figure 14 celatus Scudder. (nymph). 



Cerci as in figure 17 cercalis, new species. 



Cerci not as in either of the above 4. 



4. Posterior femora armed beneath on the outer carina with distinct spines, or shaped 



as in figure 20 5. 



Posterior femora armed beneath on the outer carina with serrations only, the 

 serrated margin often terminating apically in a more or less elongate spinelike 

 angle (fig. 18), never as in figure 20 marmorattis Rehn. 



5. Roughness of the dorsal surface of the abdomen consisting of a few small blunt 



tubercles situated mostly along the posterior borders of the segments com- 

 mencing with the second or third from the base; color shining dark brown 



salebrosas Scudder. 



Roughness of the dorsal surface of the abdomen consisting of tubercles as above 

 but present on all the segments and more generally distributed; color opaque 

 yellowish brown pacificas Thomas- 



PRISTOCEUTHOPHILUS CELATUS Scudder. 



Ceuthophilus celatus Scudder, Proc. Amer. Acad. Sci. Arts, vol. 30, 1894, p. 48. 

 Ceuthophilus henshawi Scudder, Proc. Amer. Acad. Sci. Arts, vol. 30, 1894, p. 97. 



Of the synonymy of henshawi with, celatus there is no doubt. The 

 somewhat extensive series taken by the writer in British Columbia in 

 1903 and recorded as henshawi in the genus 

 Marsa contained numbers of immature 

 specimens of various sizes, some of the 

 larger of which agree perfectly with the \c))(J 

 types of celatus, a fact not noticed until ^ ^L^^ 

 recently. It is unfortunate that the name 

 henshawi, based on adult material, has to fall 

 in synonymy under that of celatus, based on 

 imm ature specimens, but accepted rules of 

 nomenclature permit no other course. 



In this species the vertical cone is typical fig. n.— peistoceuthophilus 

 (fig. 11) and the dorsal surface of the abdo- ^^s. head, showing the verti- 

 men of the immature male shows but a few 



scattered tubercles, very little elevated but distinct, but in the adult 

 male these tubercles are very numerous and well elevated and in 

 addition there are four or five transverse, smooth elevated areas 

 about half as high as thick; in the fuU gro\\Ti nymphs these elevated 

 smooth areas are sometimes distinctly present but never conspicuous 

 as in the adult. The structm'e of the cerci of the immature male 

 differs decidedly from that of the adult; in the adult the cerci are 

 scarcely less remarkable in form than those of cercalis and tubercu- 

 lata, but very different. The cerci of the adult male is shoum at 

 figure 13 and that of the nymph at figui-e 14. The posterior femora 

 is ampliate beneath and furnished with serrations only, the termina- 

 tion of the ampliation sometimes forming a spinelike angle (fig. 12). 



