DYSCOLOTAXIA.— DIPHTTAXIS. 239 



than the posterior side. Posterior coxal plates almost triangular. Tarsi slender, the fourth joint pro- 

 longed in a lohe, the first joint of the hind tarsus longer than the others together. Claws not toothed. 



From these characters it will be seen that this genus is essentially a Fornax with the 

 middle joints of the antennae small and equal, and with simple claws. This seems to 

 be the only instance among the genera with well-defined antennal grooves in which a 

 number of the middle antennal joints are small and equal. 



1. DysCOlotaxia Championi. (Tab. X. figg. 17 ; 17 a, antenna.) 



Oblong, moderately convex, narrower posteriorly, piceous-brown, subopaque, inconspicuously fulvo-pubescent : 

 antennae entirely ferruginous ; head densely and roughly punctate, interocular ridge entire, clypeus 

 arcuate in front, less than half as wide between the antenna? as long ; thorax nearly as long as wide at 

 the base, arcuately narrowed from the base to the apex, disc convex, a short median impression at the 

 base, surface densely roughly punctate ; elytra striate, intervals closely roughly punctate, less so than the 

 thorax ; body beneath densely punctate, abdomen pubescent ; legs paler than the general colour. 



Length 6 millim. 



Hab. Panama, Bugaba (Champion). 



This insect has quite the facies of several species of Fornax found in the same region. 

 The generic characters will readily separate it. 



DIPHYTAXIS. 



Porm oblong, rather robust, narrower posteriorly. Eyes large, narrowing the antennal grooves. Antennfe 

 longer than the thorax, dissimilar in the sexes ; joints 3-10 bearing a long branch ( £ ) or serrate ( $ ). 

 Clypeus arcuate at the middle in front, the base broader than the distance to the eye. Antennal grooves 

 broad and deep, wider than the propleural triangle and not broadened in front ( <S ), or equal to the 

 triangle and distinctly wider in front ( $ ). Base of the propleural triangle (very small in the male) longer 

 than the inner side, the apex not reaching the edge of the presternum. Metasternal episterna moderate, 

 sides parallel. Posterior coxal plates broadly dilated, triangular. Pirst hind tarsal joint not so long as 

 the following joints united, the fourth excavate- emarginate. Claws broadly toothed at the base. Last 

 ventral segment slightly prolonged. 



Male. Antennae with first joint stouter, arcuate, as long as the next four, second small, third very little longer 

 than fourth ; joints 4-10 subequal in length, these (with the third) bearing each a branch three times as 

 long as the joint ; eleventh joint nearly as long as four preceding joints. Propleural triangle small, the 

 apex reaching only two-thirds to the margin of the prosternum. 



Female. Pirst two joints of the antennae as in the male, third as long as the next two, joints 3-10 serrate, 

 eleventh nearly as long as the two preceding. Propleural triangle twice the area of that of the male, 

 the apex nearly reaching the margin of the prosternum. 



This genus represents in our fauna Hodocerus of the Indian Archipelago, and differs 

 notably in the structure of the antennae, that genus having the second and third joints 

 both small. There is probably no genus in the entire family in which the antenna] 

 grooves occupy so large a space on the propectus, unless it be Macraulacus, in which 

 the entire surface is excavated. The striking difference in the antenna? in the sexes is 

 remarkable in a genus so closely allied to Fornax. 



