240 SEERICOKNIA. 



1. Diphytaxis excavata. (Tab. X. figg. 18, antenna, 2 ; 19 6 .) 



Oblong, subcylindrical, moderately convex, narrowed at the apical third of the elytra, brown, feebly shining, 

 sparsely clothed with short fulvous pubescence ; antennae, except the first joint, paler : thorax broader 

 than long, sides parallel for a short distance at the base, then arcuately narrowed to the apex, disc convex, 

 a smooth median line extending from near the base to the middle, base on each side of the middle broadly 

 but not deeply excavate, surface roughly (not coarsely) granulate ; elytra parallel, gradually narrowed at 

 the apical half, distinctly striate, intervals slightly convex, closely moderately punctate, more densely and 

 roughly at the base and for a distance along the sides ; body beneath somewhat paler than above, moderately 

 closely punctate, more finely and sparsely on the abdomen, sparsely fulvo-pubescent ; legs ferruginous. 



Length 9-12-5 millim. 



Hab. Guatemala, Teleman, Cahabon, and Senahu in Vera Paz, El Keposo, San Isidro 

 (Champion). 



HENECOSOMA. 



Oblong, parallel, depressed, cylindrical. Antennse half as long as the body, slightly broader externally, flat- 

 tened, subserrate ; first joint as long as the next three, second small, third scarcely longer than the entire 

 second and very little longer than the fourth, joints 4-11 gradually longer, eleventh narrower than the 

 preceding. Clypeus arcuate at the apex, with an indistinct notch at the middle, narrower at the base 

 than half the distance to the eye. Mandibles exposing a broad rugose face, the posterior edge slightly 

 prolonged backward. Propleurse without any trace whatever of an antennal groove, the lateral margin of 

 the thorax single and entire. Metasternal episterna moderate in width, parallel. Posterior coxal plates 

 widely dilated internally. Legs slender ; posterior tarsi longer than the tibia?, the first joint longer than 

 the following joints together, fourth small, excavate-emarginate ; claws simple. Last ventral segment 

 acutely oval at the tip, but not prolonged ; last dorsal segment simple. 



The characters given above define a genus which must be associated with the 

 Nematodes series, from the important structural details, while the facies makes it as 

 heterogeneous a member of the series as JEuraehis is to its allies. By the scheme of 

 de Bonvouloir the nearest possible ally is Hypocoslus, from which it differs in too much 

 of importance to require mention here. 



l. Henecosoma discicolle. (Tab. x. %. 20.) 



Yery black, opaque, clothed with short black pubescence ; thorax with a broad orange-yellow stripe on each 

 side, close to but not including the border, clothed with silken fulvous pubescence : head piceous or slightly 

 brown, fulvo-pubescent, densely, subgranulately punctate, front longitudinally impressed anteriorly, the 

 impression extending nearly the entire length of the clypeus, interocular ridge distinctly elevated, curved 

 around the inner border of the antennal fossa ; thorax a little broader at the base than long, sides straight, 

 slightly convergent, very slightly arcuate at the anterior angles, disc regularly convex, median line fine and 

 smooth, surface densely finely punctate and finely rugose ; elytra parallel, narrowed at the apical third, 

 finely striate, intervals flat, densely and finely submuricate ; body beneath black, less opaque than above ; 

 mesosternum sometimes brownish ; abdomen densely finely punctate, indistinctly cinereo-pubescent ; legs 

 black. 



Length 6-8 millim. 



Hab. Guatemala, Sinanja in Vera Paz (Champion) ; Panama, Bugaba (Champion). 



The only male specimen is the smallest of the series, and has the thorax entirely 

 orange-red. The species in form and colour resembles closely the North- American 

 Adelocera discoidea, or even some of the members of the genus Plateros. 



