CERAMBYCIPAE. 333 



man, which seems not sufficiently distinct from tlie European 

 gciuis to be retained in a natural cla.ssitication. 



The species of Tetraopes are numerous and very similar, l)ein«- 

 of a bright red color with small black spots on the prothorax and 

 elytra; they live exclusively upon plants of the genus Asclepias. 



Tribe XVI.— ]WETIIII\'I. 



This tribe contains the lowest organized of the Lamiidae; un- 

 differentiated forms, which exhiljit strong relationships to Oeme 

 and its allies among the Cerambycidce. 



The body is elongate, the prothorax cylindrical, the elytra 

 shorter than the abdomen, separately rounded at tip, and the 

 wings are extended along the dorsum of the abdomen, and very 

 imperfectly folded at tip. 



The eyes are sparsely pilose, very large, coarsely granulated, 

 deeply emarginate; less coarsely granulated and divided in Dys- 

 pliaga ; the front short and perpendicular, labrum obsolete, or 

 connate; mandibles short, but very stout at base, and trigonal; 

 palpi unequal, short, and cylindrical, the labial nearly pointed, 

 the maxillary truncate, with a terminal oval cicatrix or mammilla 

 representing the last joint in Methia; still more feeble and nearly 

 atrophied in D3'sphaga. The prosternum is elongate in front of 

 the coxae, which are conical and prominent; the cavities are ron- 

 Jluenf, separated behind by a very narrow point of pr<isternum, 

 widely angulated externally and open behind. Middle eoxte 

 conical, prominent, contiguous, cavities confluent, widely oi)en 

 externally; hind coxae nearly contiguous, also prominent. Ven- 

 tral segments equal in length, cylindrical in Styloxus, with the 

 5th broadly emarginate, and 6th visible ; of softer consistence, 

 5th longer with a large hairy vulva-liko excavation in three (%) 

 specimens of Methia examined ; flat with the segments imbricate 

 at the sides (as in Lam])yridiie) in Dysphaga; 5th joint deeply 

 emarginate in 9, longer in %, with tlie same vulva-lik(! excavation 

 as in Methia, but l)roader and patulous, so as to become trian- 

 gular; the abdomen is black in 9,bnt yellow in % of Dysphaga. 



The legs are moderate in Styloxus and Idremea, with the thighs 

 clavate; more slender, with the thiglis not clavate in Methia; very 

 feeble in Dysphaga ; the tarsi are short, and the last joint is as 

 long, or nearly so, as the others united; the claws are small and 

 divaricate. 



