24 Mr. G. C. Champion's Revision of the Mexican 



excepted), the pro thorax with a median vitta, and the elytra (the 

 sutural and outer margins excepted) fuscous. Eyes large and 

 prominent in (J, smaller in $. Antennae long and slender. Pro- 

 thorax (cJ) narrow, a little broader than long, binodose on the disc 

 before the base, deeply and abruptly sinuato-emarginate from 

 about the middle to the sharp hind angles, and with a shallow 

 oblique groove above at the point of interruption of the lateral 

 margin ; (?) broader and more transverse, narrowing from near the 

 base, the margins reflexed throughout, sinuate at the middle and 

 near the hind angles. Elytra long, considerably wider than the 

 prothorax, subparallel, distinctly costate on the disc. Inner claw 

 of anterior tarsi cleft and with a sharp triangular tooth at base, and 

 outer claw of the other tarsi cleft, in cj. 



cj. Ninth ventral segment broad, widened outwards, the apex 

 angularly dilated on each side and produced in the middle into a 

 broadly rounded, decumbent flap. 



Hab. Guatemala, Pacific slope and Baja Vera Paz. 



Twelve specimens seen, of which five are males, varying 

 very little in colour. The Mexican examples subsequently 

 referred to this species by Gorham have differently formed 

 tarsal claws in the male, and they are here separated under 

 the name Polemius fuscovittatus. The fissure of the inner 

 anterior claw is not easily seen in the present species : 

 D. marginatum is related to D. erosum, incisum, and 

 emarginatum. 



4. Discodon emarginatum, n. sp. 



Narrow, piceous or black, the anterior portion of the head in 

 part or entirely, the base of the mandibles, and the prothorax (a 

 median vitta excepted) pale flavous. Antennae (i^) long, sub- 

 filiform, sparsely pilose; ($) shorter. Eyes large and prominent 

 in c^, much smaller in 9- Prothorax (cj) broader than long, arcuate 

 in front, the sides abruptly constricted at the middle and gradually 

 obliquely dilated thence to the acute hind angles ; (?) wider, 

 narrowing forwards, the sides sinuate and rather broadly explanate. 

 Elytra long, wider than the prothorax in botli sexes, subparallel, 

 sinuate at the sides in $. Inner claw of anterior tarsi cleft at tip 

 and with a triangular tooth at base, and oviter claw of the other 

 tarsi cleft at tip, in cJ. 



cJ. Eighth ventral segment short, broad, broadly subtruncate at 

 the apex ; ninth segment widened towards the tip, which is obliquely 

 subtruncate on either side of the middle, two strongly curved hooks 



