LYSTRONYCHUS. 463 
a pruinose or iridescent bluish-violet tint. The example from Texas has been kindly 
communicated by Dr. Horn. 
Allied species are found in Tropical South America and southwards to Parana. 
2. Antenne shorter and stouter, subjiliform ; head and thorax dull cYaneous, 
the elytra metallic cupreous. 
2. Lystronychus purpureipennis. (Tab. XXI. fig. 8.) 
Oblong ovate, rather convex, dull cyaneous with an eneous tinge, the elytra shining and of a rich metallic 
purplish-cupreous tint, the surface clothed with long and erect scattered hairs. Head coarsely and 
densely punctured; eyes small; antenne cyaneous, rather short and stout, not reaching to the middle 
of the elytra, subfiliform, joints 3 and 4 equal, 5-11 longer than broad, and increasing a little in length 
outwardly, 11 much longer than 10; prothorax transverse, moderately convex, the sides dilated at the 
middle, constricted behind, and rounded and about equally narrowed in front, the hind angles rather 
sharp, the basal fovez obsolete, the surface punctured like that of the head; scutellum transverse, with 
scattered punctures, cyaneous, shining; elytra moderately long, subparallel in their basal half, with 
rows of moderately fine, deep, closely placed punctures, the interstices quite flat, and each with a row 
of more scattered punctures, the alternate punctures coarser and bearing a long erect hair, the punctures 
on the sutural interstice more irregular; beneath shining, dark cyaneous, closely punctured; legs dark 
cyaneous, setose, the claws ferruginous. 
Length 63 millim.; breadth 25 millim. 
Hab. Guaremata, Teleman (Champion). 
A single example, apparently a male, captured by myself in the lower part of the 
Polochic valley. 
A species distinguished by its coarsely punctured dull cyaneous head and thorax, 
cyaneous scutellum, and purplish-cupreous shining elytra. In colour this insect 
resembles L. (Xystronia) cupripennis, Lac., from Matto Grosso; but it has the thorax 
transverse (not so long as broad), and, moreover, is only about half the size of that 
species. 
3 Antenne stout, with dilated serrate joints in the male; upper surface 
opaque, black, the elytra with a red humeral spot. 
3. Lystronychus scapularis. (Tab. XXI. fig. 9, 3.) 
Moderately elongate, rather convex, black or piceous, sometimes with a bluish tinge, the elytra each with a 
red humeral patch, above very dull and opaque, the surface clothed with long and erect scattered hairs. 
Head short, coarsely and very rugosely punctured; eyes large, rather narrowly separated in the male, 
more distant in the female; antenne dark cyaneous or bluish-black, stout, in the male about reaching to 
the middle of the elytra, joint 3 much shorter and smaller than 4, joints 4-10 long and wide, flattened, 
and serrate within, and 11 much longer than 10—in the female shorter, and with joints 4-10 less 
widened; prothorax transversely convex, much broader than long, the sides strongly and abruptly 
constricted behind, broadly dilated at the middle, and there armed with two or three strong teeth, and 
rounded and narrowing in front, the hind angles acute, the base with a broad rounded median lobe, the 
basal fover obsolete, the surface coarsely and very densely punctured; scutellum transverse, sparsely 
punctured ; elytra moderately long, with rows of fine but deep approximate punctures, the interstices 
quite flat, and each with a row of minute punctures, amongst which are scattered other coarser 
