177 



slender. Outer surfkce of the hind femora flat or l)arely convex. Terminal 

 segment of the male nearly as narrow at the base as at the tip, greatly pro- 

 duced and tapering, compressed into a dull carina along the lower edge. 



T. dux, Scudd., Proc. Bost. Soc. Nat. Hist., XII, 347. 



Syn., Gryllus dtu; Drury, lus., II, PI. 40. 



{ex parte), Fab., Sp. Ins., I, 3G3. 

 (Locnsta) dux, Stoll, Saiit. et Grill., PI. Ih, Fig. 1. 

 Acridium dux, Oliv., Enc. Metb.. VI, 215, PI. 12«, Fig. 21. 

 Locusta dux, Duncan., Intr. Ent., 257, PI. 15, Fig. 2. 



(EuUdoderes) dux, "West, ed. Drury, II, 92, PI. 44. 

 Gryllus eristatus, Thunb., Mem. Acad. St. Petersb., V, 224; IX, 402. 

 Acridhm latrcillei, Fitch, Trans. N. T. St. Ag. Soc, XVI, 507 ; Third Eep., 

 172, Pis. 3, 4. 



Crest of the pronotum tipped with black ; first and second lobes as dis- 

 tinct as the others ; on the posterior half of the pronotum the crest anteriorly 

 is elevated considerably, more than in the allied species. Elytra greenish- 

 griseous ; the veins luteous and luteo-fulvous, variegated with pale blotches, 

 small and frequent on the basal half, confluent about the middle and apically, 

 forming very irregular, rather broad, and distant, zigzag bands parallel with 

 the outer border. Wings brick-red, rather broadly bordered with black at 

 the hind margin, and furnished with multitudinous black spots over the whole 

 wing ; these spots are ordinarily quadrate, transverse, but near the middle of 

 the outer border they Ijecome confluent, forming wavy bands along the longi- 

 tudinal veins, and toward the hind border they form confluent or broken 

 bands sub-parallel to the hind border ; these spots are less frequent and often 

 very indistinct in the male. Hind femora marked externally with a double 

 row of roundish spots, merging into one toward the apex ; spines of the hind 

 tiljiai greenish-black ; claws tipped with black. 



Dimensions. — Expansion of the elytra, 2 9 inches ; ^ 5.2 inches. Length 

 of the female about 4 inches. 



Texas (Scudder). 

 23 a 



