EUEACHIS.— FOENAX. 225 



acutely serrate, eleventh joint longer, obliquely emarginate ; thorax with a single sharply-defined marginal 

 line which limits the antennal groove externally, the latter deep and smooth, rather broad, of equal width, 

 more than half the width of the propleural triangle, this longer than wide at the base, but not sharply 

 limited internally : prosternal sutures well marked ; metasternal episterna moderate in width, slightly 

 narrowed near the front ; posterior coxal plates broadly dilated internally, but not narrow externally ; last 

 ventral segment prolonged in a point as in Nematodes ; legs rather slender but not long ; hind tarsi much 

 longer than the tibiae, the first joint not so long as the following joints together, fourth joint small, 

 excavate-emarginate ; claws broadly toothed at the base. 



This genus shows affinities in several directions. By the system of de Bonvouloir it 

 is related in its more important characters to the genera allied to Dromceolus, but 

 differs from all of them in not having the antennal groove sharply limited on its inner 

 border. The structure of the last ventral segment suggests the genera allied to 

 Nematodes, while the antennae are of a form not known to me elsewhere in the family. 



l. Eurachis elegans. (Tab. x. fig. 14.) 



Elongate, punctate, depressed-cylindrical : antennas black, nearly as long as half the body ; head densely 

 coarsely punctured, fulvo-pubescent, orange-red, with a large frontal space reaching the occiput piceous, front 

 convex, a faint median impression anteriorly which extends on the clypeus, this broadly arcuate in front, 

 its base wider than half the distance to the eye : thorax wider at the base than long, sides at the posterior 

 two-thirds slightly sinuous, convergent in front, anterior third arcuately narrowed, disc convex, the basal 

 declivity rather flat, a short smooth median line near the base, a slightly transverse concavity each side of 

 the centre of the disc, surface densely subrugosely punctate, clothed with conspicuous silken fulvous pubes- 

 cence, darker in colour along a broad median line, colour of the surface orange-red, a large piceous space of 

 somewhat triangular form with the base in front joined by a broad band to a piceous space transversely 

 placed at the base, at each hind angle a triangular piceous space ; elytra parallel, narrowed at the apical 

 third, finely striate, intervals slightly convex, closely finely punctured, the punctures forming short 

 transverse strigae, colour paler orange, the suture, apex, and sides piceous, the latter gradually more 

 widely from the humerus to the apex ; prothorax beneath orange-yellow, prosternum closely finely punctate, 

 fulvo-pubescent, intercoxal prolongation elongate-triangular; body beneath and abdomen piceous-black, 

 moderately shining, abdomen very finely, not densely punctate, finely pubescent; legs piceous, tarsi 

 ferruginous. 



Length 8*5 millim. 



Hdb. Nicaragua, Chontales (Belt). 



The appearance of this insect is quite unlike that of the Eucnemidse generally, 

 although the form is not strikingly different from that of ArrMpis. 



FORNAX. 



Fornax, Castelnau, in Silberm. Rev. Ent. iii. p. 172 (1835) ; de Bonvouloir, Mon. des Eucnemides, 



p. 295. 

 Isarthrus, Leconte, Proc. Acad. Phil. vi. p. 48. 

 Onychodon, Newman, Ent. Mag. v. p. 384. 



This genus from its magnitude as well as its organization, is the central figure of the 

 family, and while containing nearly one hundred species, is more homogeneous in facies 

 and organization than usual in genera with such numerous representatives. There is, 

 however, a tendency to approach Plesiofornax through those species in which the fourth 



biol. centr.-amer., Coleopt., Vol. III. Pt. 1, November 1890. 2 Gr 



