656 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Some wi'iters term the apical dorsal spm-s, as herein used, the 

 upper calcars and the smaller lower calcars they call ventral spines. 



The nomenclature of the typical hind tibial 



armature as used in the present paper is 



explained in figure 1.^ This type of ar- 



1 mature, however, especially as relating to 



the dorsal spurs, belongs only to Ceutlio- 



pliilus and its closer relatives, i. e., Pristo- 



_ _ _ . 3 ceutliojuMlus, Phrixocnemis, Rhachocnemis, 



Udeopsylla, DaiJiinia, and Hemiudeopsylla. 



In these genera there are generally five 



--•5 pairs of dorsal movable spurs, but some- 



8 ---'i "^^TVxiill^ times there are six or seven. The remain- 



7"--\^-^s yj jj^g genera of the group, Tropidischia, 



'?;„H;;™rcrXrv"r.:: IMenoe^s, Oiestrammena, Cnemotettix 



SPINES OF A TYPICAL HIND TiBLv. 1-5, aud Gammarotettix , have a different type 



S:«SK"r,™Vr" "'""^ of armature, the dorsal spurs being more 



numerous and, except in HadenoecuSfin&r- 

 ticulate and not strongly differentiated by greater size from the smaller 

 dorsal spines or serrations. 



The supraanal plate in the male is usually more or less concealed 

 beneath the last dorsal segment of the abdomen, which is often 

 somewhat produced and sometimes apically cleft. 



The genera comprising this subfamily of apterous katydids may 

 be separated by the following key: » s 



KEY TO THE NEARCTIC GENERA OF RHAPHIDOPHORINAE. M 



1. All the tibiae square in transverse section and similarly armed above and beneath 



on both outer and inner margins with short, heavy, close-set spines of equal 



length (fig. 2) Tropidischia Scudder. 



None of the tibiae at all as described above 2. 



2. Basal segment of the hind tarsus truncate posteriorly above, or scarcely at all 



produced 3. j 



Basal segment of the hind tarsus produced posteriorly above into a stout spine, or M 

 tapering spinelike process (fig. 6) 4. 



3. Legs very long and slender, the fore femora more than twice as long as the pronotum; 



(last palpal segment in dried specimens cleft beneath only apically). 



Iladcnoccus Scudder. , 



Legs shorter and stouter, the fore femora less than twice as long as the pronotum. .5. 

 4 Fore and middle femora with a long genicular spine on one or both sides; hindl 

 femora as long as, or longer than, the body; second segment of the hind tarsuai 

 about as long as the fourth segment exclusive of the claws, two or more times as 

 long as the vertical depths (fig. 3) Dicstrammcna Brunner. 



Femora without genicular spines, the hind femora distinctly shorter than the 

 body; second segment of the hind tai'sus bai'ely one-half as long as the fourth, 

 scarcely longer than the vertical depths (fig. 6) Gammarotettix Brunner. 



1 The drawings illustrating this paper were made by Miss Mary Carmody. 



