250 I'liOCEKUiyaS OF rilK XAIIoyAL MCSELM. vol.xx. 



tliaii the pronotnin, attingent, rotuiulato-ovate, less tLan half as long 

 iigaiii as broad, apically roimded, bntwnisb ♦uscous. Fore and middle 

 femora somewhat rounded in the male; hind femora ferrngineo fuscous 

 or tiavofust'ous, darkest along the upper half of the outer faee, without 

 fasciation. the un(U'r and inner facts tbivous or pale sanguineous, the 

 genicular arc blackish; hiiul tibiae dark glaucous, tiie spines pallid 

 in basal, black in apical iialf, nine ty eleven, usually ten, in number 

 in the outer series. Extremity of male abdomen clavate, considerably 

 recurved, the supraanal ])late hastate wiih rectangulate apex, the sur- 

 face nearly plane, tlie median sulcus shallow, nariow, and narrowing, 

 inclosed between low rounded walls, which unite ner.r the middle of the 

 plate; furcula reduced to two slight, approximate, blunt denticulations, 

 overlying the base of the just-meiitioned ridges; cerci broad at base, 

 tapering rapidly and subecpially so as to form long triangular plates, 

 faintly incurved, apically faintly decuived and finely acuminate at 

 tip, the lower margin faintly concave; subgenital plate small, not much 

 longer than bro.id, very broadly and bluntly subconical, the cone form- 

 ing a feeble a'ul blunt apical tubercle, the lateral and apical margins 

 «»n the same plane, well rounded, entire. 



Length of body, male, 14..") mm., female. IS mm.; antennae, male, .~).6 

 mm., female, r»..") mm.; tegmina, male and feunile, 3.25 mm.; hind femora, 

 male, 0.1 mm., female, 10 mm. 



Two males, 1 female. Mount Alvarez, San Luis Potosi, Mexico, E. 

 I'almer. 



This species is the most aberrant of its series. 



15. PFER SERIES. 



In the species of this small group, the prozona of the male (and 

 generally of the female) is longitudinal and nearly twice as long as 

 the metazona, with its truncate or feebly produced !dnd nargin; the 

 median caiina is similar throughout. The interspace between the 

 mesosternal lobes in the same sex is slightly or nundi longer than 

 broad. The nnile antennae are long and considerably nger ])ropGr- 

 tionately than those of the female. The tegnr' are abbreviate, of 

 about the length of the i)ronotum, obovate and apically rounded. 

 The hind tibiae are prevailingly glaucous, tiie spines ten to eleven, 

 rarely nine, in number in the outer series. 



The supraanal ])late of the male is triangular or hastate, the surface 

 subtectate with a deep median sulcus; the furcula is variable in length, 

 either reduced to mere denticulations or developed as parallel spines 

 nearly a third as long as the supraanal plate; the cerci are small and 

 styliform with slight concavity of the upper margin, acuminate and 

 nnich shorter than the supraanal plate; the subgenital idate varies 

 considerably but is rather full, and the apical margin entire. 



Two species are known, one very small from Florida, the other rather 

 large from Texas, and they are bronght together in one group princi 

 pally fiom their simple styliform cerci. 



