34 



furnished with greenish black spines ; claws of tarsi tipped with black. 

 Expanse cf tegmina, ? 215-236 "™-, average 227"™- $ 130 """• 



Bay of Honduras (Drury), Surinam (Stoll'), Panama (Fitch). 



Panama, Texas (Mus. Comp. Zool.), Aspinwall (Smith. Inst.), 

 Nicaragua, Guatemala, Tehuantepec (my coll.). 



It is evident that the ordinary application of Drury's name of dux 

 to the Brazilian species which I have characterized under the name 

 of Fabricii is incorrect. These pages prove that there are two dis- 

 tinct species in Brazil and on the Isthmus, and that Drury's figure 

 and description of Gryllus dux, as well as the locality given by him, 

 apply only to the species from the Isthmus. 



Specimens from the Isthmus, which I consider to belong to the'^. 

 ia/7"ei7/ej of Fitch, differ from the description and figures of J.. Za- 

 treillei by Perty, in the following particulars: the tegmina are brown- 

 ish fuscous and not violaceous; the tarsi are obscure red and not 

 blood-red; the crest resembles that of 7\ Fabricii, only it is more 

 elevated, while in T. Latreillei the second and third lobes of the crest 

 are elevated above the others, and the first is nmch more prominent 

 anteriorly than behind; the spines of the hind tibiae are black through- 

 out, instead of being merely black tipped. 



They differ also from Serville's description of A. Latreillei in hav- 

 ing the spots in the vicinity of the anterior border quadrate and not 

 rounded and punctiform. 



Thunberg's descriptions apply best to this species; " postice vix 

 rugosus, crista minori serrulata," or " posticus planus, carina minori, 

 serrulata," spoken of the thorax, cannot apply to the true crislatus. 



StoU's figure seems to apply to this species rather than to T. La- 

 ireillci, the only other one to which it could refer. 



2. T. rex Scudder. 



First and second lobes of pronotum nearly connate, elevated pos- 

 teriorly more than anteriorly ; posteriorly with a mixture of dull and 

 sharp serrulations. Tegmina brownish fuscous, obscure apically, 

 tinged with olivaceous basally ; on the basal half the secondary veins 

 are bordered with pale greenish yellow, broadening into spots and 

 irregular blotches in the middle field ; on the apical half the spots are 

 paler, more obscure, become dirty white at the apex, and show a ten- 

 dency to group themselves into narrow distant bands, which (except- 

 ing at the extreme apex) cross the tegmina at right angles to the 

 lower border, or even incline a little toward the base. Wings brick 

 red, with a very broad black outer margin and rows of black spots 

 over the whole wing, often confluent, and arranged much as in the 



