84 MEMOIRS ON THE COLEOPTERA 



it differs from any of the above species in the long sternal hairs and 

 non-metallic basal joint of the antennae, among other characters: 



*Plusiotis adelaida ssp. pavonacea nov. Stout, oval, convex, shining, 

 more polished than in the woodi or beyeri types, rich pale chocolate-brown 

 in color, the head, except the middle of the front and two very large discal 

 spots on the pronotum, each of which is medially prolonged to base and 

 apex, green, each elytron with intervals I and 4, the seventh sulcus and 

 the external margin also bright green; entire under surface and legs pale 

 red-brown; head distinctly more than half as wide as the prothorax, the 

 clypeus and depressed median part of the frontal apex strongly and 

 closely punctate, the remainder very finely and sparsely; apex of the 

 clypeus very feebly sinuate medially; prothorax twice as wide as long, 

 with distinct basal lobe and well defined apical angles, the surface smooth 

 and punctureless, rugulose in the marginal gutter, the basal bead be- 

 coming feebler medially as a rule; scutellum green, brown along the 

 middle, slightly wider than long, ogival and with feebly arcuate sides, 

 the surface smooth; elytra each with nine rather regular and very shallow 

 striae of fine, distinct punctures, the seventh larger, broadly impressed, 

 sulciform and tinged with green, the third and fourth, inclosing the green 

 discal vitta, also a little stronger than the others; pygidium pale coppery- 

 brown, finely and sparsely punctate; intermesocoxal process rather well 

 developed. Length (9) 26.8-29.3 rnm.; width 14.8-15.5 mm. Mexico 

 (Guerrero) , Baron. 



This form differs from adelaida Hope, of which ornatissima 

 Sturm is virtually synonymical, not only in color but in the very 

 shallow clypeal sinuation, the apex in adelaida being, according to 

 Burmeister, "tief eingeschnitten"; the elytral intervals in the 

 latter species are also said to be "gewolbt"; in pavonacea they are 

 very feebly and broadly convex, some of them in fact nearly flat. 



Plusiotina n. gen. 



The general characters in this genus are very much as in Plusiotis, 

 but the habitus is quite different, because of the small head, with 

 relatively larger eyes, and more narrowly cylindric-oval body, with 

 well impressed and subequal elytral striation. In addition it 

 should be said that the anterior thoracic angles are very much less 

 prominent, the ambient beading uninterrupted at the thoracic 

 apex, the mandibles more sinuate externally and the intermeso- 

 coxal process much reduced, in fact almost vestigial. The basal 

 joint of the antennae is never metallic and the sterna are clothed 

 with long hairs. The species are moderately numerous, those in 

 my collection being the following: 



