REHX AND HEBARD 181 



readily distinguished by the decidedly more slender form, differ- 

 ently shaped lateral lobes of the pronotum, narrower tegmina 

 with male tympanum decidedly more elongate, different colora- 

 tion, and different male cerci. 



Lateral lobes of pronotum broad, cephalic margin moderately 

 oblique and nearly straight to the very broadly obtuse-angulate 

 ventro-cephalic angle, thence very weakly concave and slightly 

 more horizontal than usual to the sharply rounded ventro-caudal 

 angle which is slighth' less than 90°, caudal margin convex to the 

 broad and distinct humeral sinus, convex callosit}^ very broad. 

 These lobes are often more or less distinctly marked mesad with 

 a diffused dark postocular stripe. The abdomen is marked in 

 dark individuals with three narrow dark bands, one meso-dorsal, 

 the others lateral, the two intervening spaces forming usually 

 bright yellow bands. The pronotal markings, combined with the 

 narrowness of the abdominal bands, give individuals showing the 

 intensive color pattern a much more striped appearance than 

 is ever found in fasciatus. The cerci are bright green or dark 

 brown; -" the greater production, especialh' of the distal portion, 

 eausing the internal tooth to be situated in relative position just 

 proximad of the point which it occupies in fasciatus. Though 

 the genicular lobes of the caudal femora are normally bispinose, 

 fifteen of the series of sixty-six specimens examined for this 

 character have one of these lobes unispinose, two have two of the 

 same showing this condition, while two have three of the genicular 

 lobes unispinose. In this species the genicular areas of the caudal 

 femora are not darkened; the ventral margins of the caudal 

 femora are unarmed. Immature examples of gracilUmus are 

 very slender and very strongly tristriate. -"^ 



The present species is confined in distribution to the Florida 

 Keys and the mainland of southern Florida as far north as Fort 



^^ In life tfie male cerci are probably always green or gi-eenish, this color is 

 one of the most likely to disappear in dried material. 



^^ Of the immature specimens recorded as this species by the present authors, 

 Proc. Acad. Xat. Sci. Phila., 1912, p. 268, (1912), those from Miarni and Home- 

 stead, Florida, are immature examples of Ordtelivmm concinnum, while the 

 two immature individuals from Key \'aca and Kej' West, Florida, are speci- 

 mens of Odonloxiphidium apterum. These errors were due to our then very 

 limited knowledge of the early stages of these species, which exhibit indeed a 

 general (though not detailed) similarity to gradllimus. 



TR.\XS. AM. EXT. SOC, XLI. 



