NO. 1335. WALKINGSTICKS OF THE UNITED STATES-CAVDELL. 867 



hb Middle femora of the male much swollen, distinctly thicker than the posterior 

 ones; posterior femora armed beneath on the median line near the apex 

 with a single spine, in the male very prominent, in the female often very 



- small and sometimes wholly absent Diapheromera Gray. 



act. Head ovate, short, scarcely longer than broad, attached vertically (Plate LVII, 

 fig. 2a); male cerci spatulate, much broader apically than at the base (Plate 

 LVII fi°" 2&) Megaphasma, new genus. 



PSEUDOSERMYLE, ne^A^ genus. 



Head subcylindrical, distinctly longer than ])road, horizontally 

 attached to the thorax and in front between and ))ehind the eyes either 

 carinate or longitudinally rugose; antennse no more, or but little more, 

 than twice as long as the anterior femora; legs unarmed; basal seg- 

 ment of the abdomen generally subquadrate in the female, twice or 

 more than twice as long in the male. Cerci of the female simple, of 

 the male apically trifid. 



This genus, of which P. hanhsii may be considered the type, is most 

 nearly allied 'to Sermyle Stal, but differs in the character of the male 

 cerci' which are simple in the latter genus.« The head of the only 

 species of SermyJe examined, a female from Guatemala, is very much 

 shorter in proportion than found in the species of Pseudosermyle. It 

 is also somewhat closely allied to Bacunculus, and the most stable 

 character for its separation from that genus, exclusive of the male 

 o-enital characters, seems to be the dorsally carinate or rugose head. 

 " The males of Psmdosermyle strigata and arhvsmU are unknown and 

 it mav be that these species will eventually prove to belong to S^rmyl^ 

 but until the male sex is made known it is deemed safest to include 



^^Lnayle is represented in the United States by five species, 

 which mav be separated by the following tables. The first table i.. 

 based wholly upon the characters of the female: 



a Body multicarinate or longitudinally rugose. . „-;.ltl.- Minr-vm-d 



h. Cerci short, no more than three tunes as long as the greatest Nvidth, sup.aanal 



nlate subtruncate or obtusangulate at the apex. 



lilatesuoirumai & posterior ones about mne 

 c. Femora short and stout (Plate l.\ m, n«- N arhnscula Rehn. 



mm. in length.. i'" V V/"pi'tp Yvm fi'/ 3''V,'the posterior ones 



a-. Femora longer and more slender (Plate L^ HI, h.. ^ ),^^^J^ ^^^^ ^^^^^^^ 



about twenty mm. "^ ^"S^'^" ■-, ---^;-;;; VuhV^i.praanal plate acutely 

 Ih. Cerci long, six tmies as long as the greatest NMcitn, I _ __^^^^.^^^^ g^^^^,, 



angulate at the apex ■■-• ^ ^ ^ __,f,.amineu,s Scudder. 



ort. Body smooth , i .. <.i 



i..„.„,«.-«.fe ..«a.» doe, not .,n-. ZZ^2:^^^ 

 reason that the female is unknown, ihe ^pecie^, o^ wu 



'^^^^^^^^^^^^^^^^^^^^^^ tC"^ 



known, but . male specimen that 8ta '^^^^'^'^.f^^^ referred to 



had simple cerci, as in Bacancalu.. Besides this, othtr Mexica p 

 this genus have simple cerci. 



Proc. N. M. vol. xxvi— 02 58 



