602 PHYTOPHAGA. 



I am compelled to separate this insect from M. sallcei and M. marginata on account 

 of the following differences : — the thorax is fulvous (instead of black as in M. sallcei), 

 and the elytra are rather more finely punctured and of a bluish-plumbeous tint. 

 More than a dozen specimens before me agree in these differences and show no inter- 

 mediate stages. In M. marginata the elytra are rugose-punctate and margined with 

 ferruginous. I am, however, unable to separate satisfactorily the female of the present 

 insect (a single specimen only of this sex is before me) from that of M. sallcei ; it seems 

 to differ only in the flavous thorax. 



4. Metacycla robusta. (Tab. XXXIV. fig. 4.) 



Ovate, strongly dilated posteriorly, fulvous ; antennae black, the basal (and sometimes the apical) joints fulvous ; 



thorax strongly transverse ; elytra black, finely and closely punctured, depressed below the base. 

 Length 3 lines. 



Hab. Costa Eica (Van Patten) ; Panama, Bugaba (Champion). 



I have placed this species in Metacycla because it possesses all the characters peculiar 

 to that genus ; the thorax, however, is much more transverse in shape, and the elytra 

 are remarkably widened and convex. In one specimen (from Bugaba) the first four 

 and the last two joints of the antennas are fulvous, in the other example the basal joint 

 only is of that colour. The thorax is at least three times broader than long and 

 impunctate, the sides are slightly, and the posterior margin distinctly, rounded; the 

 elytra are very shining, black, closely punctured, and have a depression below the base, 

 and their epipleurse are continued below the middle ; the posterior tibiae are armed 

 with a small spine ; the first joint of the posterior tarsi is as long as the following two 

 joints together ; and the prosternum is very narrow, but distinct between the coxae. 

 In one specimen (probably the male) the last abdominal segment is sinuate at its outer 

 margin, in the other it is simple ; both examples have the same robust and dilated 

 appearance. 



PLATYMORPHA. 



Body elongate; antennae longer than the body, the second and third joints extremely short, the other joints 

 elongate-triangular; thorax subquadrate, the disc depressed; elytral epipleurse continued below the 

 middle ; the posterior tibiae mucronate ; the first joint of the posterior tarsi as long as the following three 

 joints together ; claws appendiculate ; the anterior coxal cavities open. Anterior tibiae and the first joint 

 of the anterior tarsi strongly dilated in the typical species in the male. 



Type Platymorpha variegata. 



In general appearance Platymorpha agrees with Chthoneis; the third joint of the 

 antennas, however, is extremely small, and the posterior tibiae are armed with a spine 

 The last-named character proves the affinity of Platymorpha with Luperiis and its allies. 

 I probably have only male specimens of P. variegata before me ; these are at once 



