PHYDANIS.—PSYLLIODES. ~ 3511 
as ten-jointed: this is evidently a misprint, as both Aspicela and Phydanis have these 
organs eleven-jointed.. A single species is now added from Mexico; it is closely allied 
to the North-American P. bicolor, 
1. Phydanis nigriventris, (Tab XLII. fig. 23.) 
Black, the head, antennae, thorax, and legs fulvous; elytra metallic violaceous-blue, punctate-striate, the inter- 
stices finely punctured. 
Length 1 line. 
Head broad, the vertex convex and with a few fine punctures, the frontal tubercles broad, not strongly raised, 
the space below the eyes deeply excavated for the reception of the basal joint of the antenne; the antenne 
extending to two-thirds the length of the elytra, fulvous, rather robust, the third joint slightly longer than 
the fourth; thorax transversely convex, nearly three times as broad as long, the sides rounded, the angles 
obtuse, the posterior margin sinuate on each side, the surface very minutely and finely punctured, fulvous ; 
scutellum black; elytra short, subcylindrical, convex, dark blue, distinctly punctate-striate, the interstices 
minutely punctured ; underside (that of the thorax excepted) black; legs fulvous; the tibice deeply 
channelled ; claws appendiculate ; anterior coxal cavities open. 
Hab. Mexico, Chilpancingo and Amula, both in Guerrero (H. H. Smith). 
Two specimens. This species resembles P. décolor, Horn, in the coloration of the 
upper surface; but. it differs from it in having the underside black, and the elytra 
strongly punctate-striate, the punctures distinct to the apex. P. nigriventris is not 
unlike Gastrophysa polygont in its general facies, though it is very much smaller than 
that insect. 
-PSYLLIODES (p. 393). 
This genus possesses closed (not open) anterior coxal cavities, and it must therefore 
be placed in the same section as Chetocnema &c. Weise gives the claws as appendi- 
culate, in opposition to Chapuis.and Horn, who describe them as simple; they are 
certainly simple in the American species which have come under my observation. 
3. Psylliodes mexicana. 
Below black, above bronze-coloured ; the basal joints of the antenne and the tibie more or less fulvous ; thorax 
very strongly and closely punctured ; elytra deeply punctate-striate. 
Length ‘1 line. - 
Head minutely granulate, with some very fine and distantly placed punctures; antenna about half the length 
of the bedy, the lower five joints fulvous, the others fuscous ; thorax about one half broader than long, 
narrowed auteriorly, the sides straight, the anterior angles oblique, sharp, the surface closely and almost. 
rugosely punctured, the punctures irregularly placed, large, intermixed with smaller ones; elytra deeply 
and regularly punctate-striate, the punctures somewhat transverse in shape, the interstices scarcely wider 
than the punctures and slightly wrinkled (when viewed laterally) ; underside black, finely pubescent; the 
femora at the apex and the tibize and tarsi fulvous, more or less stained with fuscous. 
Hab. Mexico, near the city (H. H. Smith). 
The anterior tarsi of the male are distinctly dilated and the last abdominal segment 
is slightly concave in this sex. ‘The species seems to be closely allied to P. punctulata, 
