178 GEO. H. HORN, M. 1). 



<EDIONY€HIS Latr. 



Head inserted in the prothorax to the posterior border of the eyes 

 front variable, either regularly declivous from the occiput with mouth 

 more anterior, or abruptly vertical from the insertion of the antennae 

 so that the mouth is more inferior, the carina usually obtuse, the tu- 

 bercles usually feebly developed. Antennae approximate at base, 

 slender. Thorax always much broader than long, deeply emarginate 

 in front, the margin more or less dilated, often widely, the front an- 

 gles dentiform or not, base arcuate, more or less obliquely sinuate 

 near the posterior angles. Elytra oval, the margin often explanate 

 the humeri not prominent. Prosternura not depressed between the 

 coxge, moderately wide between them, dilated behind, the cavities 

 open behind, angulate externally, exposing the trochantin. Meta- 

 thoracic i:)arapleur?e rather wide, parallel and always more i-oughly 

 sculptured than the adjacent part of the sternum. Legs short and 

 robust, the anterior and middle femora fusiform, the tibise slightly 

 broader at apex, the outer edge deeply grooved, ciliate along the 

 edges; tarsi with first joint oblong, triangular, second smaller and 

 narrower, third subbilobed, fourth with the claws divaricate and ap- 

 pendiculate at base. Posterior femox'a very stout and thick, some- 

 times nearly as wide as long, deeply grooved beneath for the tibia; 

 these short feebly grooved on the posterior edge, which has a sinua- 

 tion just above the insertion of the tarsi and limited above by a 

 small acute tooth ; a single slightly curved spur at the tip of the 

 tibia. Tarsi more slender than in front, the claw joint gk)bularly 

 swollen, the claws small and appendiculate. Plate VII, fig. 11. 



In a study of the comparatively small number of species two forms 

 of head were observed with other characters in association. As a 

 rule, the outline of the head when viewed laterally forms a regular 

 curve from the occiput to the mouth. In our smaller and more de- 

 pressed species, the front below the insertion of the antennas is nearly 

 vertical, so that the mouth is somewhat retracted and opens interiorly^ 

 while in the larger species the mouth is anterior. AVhen the front is 

 regularly arcuate, the antenna^ are sc^newhat stouter and rarely reach 

 the middle of the body, the front between the eyes has not the deep 

 transverse groove, while the tubercles are rather more distinct. In 

 those with the vertical front the antennse are slender and usually 

 longer than half the body, the interocular groove is deep, while the 

 tubercles are not distinct. The sjiecies of the first series are larger 

 and convex, those of the second smaller and more depressed. 



