204 OETHOPTEEA. 



cc. Slenderer, general colour fusco-olivaceous. Lower lateral edges 

 of female pronotum pale, and with the tegmina brunneous or 



fuscous. Male not provided with reddish markings ... 5. marginatum, sp. n. 

 AA. Tegmina plainly broadening apically. Pronotum tectiforin, the 

 median carina usually rather conspicuous and percurrent. 

 b. Fastigium of the vertex plainly longer than one of the eyes, even 



in the female. Mesonotum black. (Tepic and Guanajuato.) . 6. borrei, Boliv. 

 bb. Fastigium of the vertex little, if any, longer than one of the eyes, 

 in the female usually shorter. Mesonotum varied with yellow. 

 c. Anterior and middle femora of male very robust. 



d. Body dull wood-brown in both sexes, the surface evenly 



rugose. Pronotum without definite lateral carinse ... 7. rugosum, sp. n. 

 dd. Body of male at least more or less glabrous. General colour 

 variable. Lateral carinse of the pronotum more or less 

 prominent. 

 e. Larger ($, length 26 mm.). Pronotal carinas complete, 

 glabrous. Colour fusco-piceous varied with yellow. 

 Fastigium of the vertex with its sides but little con- 

 vergent anteriorly. Body robust, $ 8. barretti, sp. n. 



ee. Smaller (<J, length 20-22 mm.). Lateral carinas of the 

 pronotum interrupted or obscure. Fastigium of the 

 vertex with its sides rather strongly convergent. Body 



of male more slender . . 9. purpurascens, Charp. 



cc. Anterior and middle femora of males but little enlarged. 



d. Median carina of the pronotum weak. Fastigium short, the 



sides rather strongly convergent 10. planum, sp. n. 



dd. Median carina of the pronotum fairly conspicuous. The 



fastigium with its sides nearly parallel 11. minimum, sp. n. 



1. Sphenarium histrio, Gerst. 



Sphenarium histrio, Gerst. Stett. ent. Zeit. 1873, p. 196 1 (nee Bolivar). 



Bab. Mexico *, Colon [Aspinwall], Barrios or Isthmus of Tehuantepec (coll. S. H. 

 8c udder). 



A single discoloured female specimen from Tehuantepec is referred here. It is 

 larger than any other Sphenarium before me, and measures the same as Gerstaecker's 

 male (length 33 millim.). 



2. Sphenarium earinatum, Boliv. 



Sphenarium earinatum, Boliv. Bol. Soc. Esp. Hist. Nat. 1904, pp. 306, 307 \ 

 Hob. Guatemala, Testuaco, Santa Eosa x (coll. U.S. Nat. Mm.). 



A male and female in the United States National Museum seem to belong here, as 

 they agree with Bolivar's description and come from the type locality. 



