250 PROCEEDINGS OF THE NATIONAL MUSEUM. 



than the pronotuin, attingent, rotundato-ovate, less than half as long 

 again as broad, apically rounded, brownish fuscous. Fore and middle 

 femora somewhat rounded in the male; hind femora ferrugineo fuscous 

 or flavo-fu scons, darkest along the upper half of the outer face, without 

 fasciation, the under and inner faces flavous or pale sanguineous, the 

 genicular arc blackish; hind tibiae dark glaucous, the spines pallid 

 in basal, black in apical half, nine to eleven, usually ten, in number 

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

 recurved, the supraanal plate hastate with rectangulate apex, the sur- 

 face nearly plane, the median sulcus shallow, narrow, and narrowing, 

 inclosed between low rounded walls, which unite near the middle of the 

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

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

 tapering rapidly and subequally 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 broad, very broadly and bluntly subconical, the cone form- 

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

 on the same plane, well rounded, entire. 



Length of body, male, 14.5 mm., female, 18 mm.; antennae, male, 5.6 

 inm., female, 5.5 mm. ; tegniiua, male and female, 3.25 mm. ; hind femora, 

 male, 9.1 mm., female, 10 mm. 



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

 Palmer. 



This species is the most aberrant of its series. 



15. PUER 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 hind margin; the 

 median carina is similar throughout. The interspace between the 

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

 broad. The male antennae are long and considerably longer propor- 

 tionately than those of the female. The tegmina are abbreviate, of 

 about the length of the pronotum, obovate and apically rounded. 

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

 rarely nine, in number in the outer series. 



The supraanal plate 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 

 styliforin with slight concavity of the upper margin, acuminate and 

 much shorter than the supraanal plate; the subgenital plate 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 brought together in one group princi- 

 pally fioni their simple styliforin cerci. 



