197 



ous, filiform, slightly flattened, green at the base, as long as the head and 

 pronolum together. Pronotum with three slight transverse-impressed lines ; 

 anterior border much rounded ; posterior border hardly excavated (?) ; sides 

 very shghtly rounded. Prosternum with a transverse ridge. Femora and 

 four anterior tibiae thick ; spines of the latter extremely minute ; posterior 

 tibise with two rows of rather long, black-tipped spines. 



Length, 0.93 inch. 



Vera Cruz (Walker). . 



This evidently does not belong to Opomala, and Mr. Walker places it 

 here with a mark of doubt. It jirobably should be placed in Saussure's 

 genus Ichthydion, which will be found described below. 



O. niesieana, Sauss., Rev. et Mag. Zool., XIII (1861), 156. 



Slender, linear, testaceous-yellow beneath, obscure-roseate above. An- 

 tenna3 scarcely flattened, rotundate, whitish, moderately dilated at the base. 

 Eostrum of the vertex trigonal, broad as long. Pronotum rotundate, without 

 carinse, densely punctate, with a yellow^ fascia on the lower margin. Elytra 

 much longer than the abdomen, narrow, acuminate at the tip. Posterior 

 femora about half as long as the elytra ; the pinnate furrows of the disk 

 obtuse-angled (scarcely V-form at the base). 



Length of the body, l.fiS inches ; elytra, 1.32 inches. 

 Mexico (Saussure). 



This is probably the same as my Mesops chlorizans and Walker's Stena- 

 cris chlorizans. 



O. stenobotliroides, Walk., Cat. Dermap. Salt., V, supp , 52. 



Male. — Tawny, slender, testaceous beneath. Head and pronotum with 

 two blackish very irregular stripes on the outer sides of the lateral keels. 

 Head elongate ; tip of the vertex conical, prominent, with a conical-shaped 

 furrow ; front punctured, oblique, with four well-defined keels, which diverge 

 toward the face. Eyes pyriform. Antennae flat, slightly dilated toward the 

 base. Pronotum minutely punctured, with a slight dorsal keel; lateral keels 

 sharply defined. Hind femora a little longer than the abdomen, with a black- 

 ish stripe on the outer side. Hind tibise a little shorter than the hind femora ; 

 spines black at the tips. Elytra pale-green, with several black dots, which 



