450 PROCEEDINGS OF THE \ \TK>X\L WOSEX \I. vol.38. 



Antennae with thirteen segments, brownish gray, all the segments 

 very thick, third scarcely longer than broad, fourth really broader 

 than long; filth globular, the rest gradually lengthening and also 

 t hickening. 



Head tumid, hinder margin straight, sides convex, and in front 

 triangular; the small marks on the frons indistinct. The punctu- 

 lations are exceedingly fine. 



The eyes are very large and prominent, ovate in shape, and extend 

 from the insertion of the antenna almost to the posterior margin of 

 the head, gently converging posteriorly. 



Pronotum about one and one-half times as long as the average 

 breadth, all margins straight, sides gently diverging as the pronotum 

 widens somewhat posteriorly. The anterior margin has the middle 

 portion produced slightly, and carries a short but distinct cylindrical 

 neck, so that the head is distinctly separated from the pronotum. 

 Mesonotum transverse, posterior margin truncate: >ides not keeled, 

 but raised with blunt, tumid ridges converging posteriorly. Metano- 

 hini strongly concave posteriorly, almost entirely covering the first 

 abdominal segment. 



The whole of t he thoracic plates are dull black and densely and finely 

 punctulate. 



The presternum is twice as long as wide, parallel. 



Mesosternum and metasternum somewhat broader than long, the 

 posterior margin truncate: sternal plates reddish black and densely 

 and finely puncl ulate. 



Legs typical, femora slender, black, yellow at the base and apex, 

 long and slender. 



Tibia' long and slender, yellowish. 



Tarsi yellowish, long and slender. The second segment elongate 

 and cylindrical, nearly as long as the third : the first is longer than 

 I he second and third combined. 



Abdomen typical, of the same color and sculpture as the rest of 

 the body, passing to reddish beneath; lateral tubercles on third and 

 fourth segments faint. Last dorsal segment very short and trans- 

 verse, hut narrower than the abdomen; posterior margin narrowed, 

 and concave in the middle, leaving a short t riangular lobe on each side 

 project ing slightly over the forceps. 



Penultimate ventral segmenl short and broad, very obtusely 

 rounded. 



Pygidium short, very narrow, and compressed. 



Forceps with the branches remote at the base, cylindrical, tapering, 

 straight at first, gently arcuate toward the apex. 



Guatemala. Provincia de Aha Vera Paz, Trece Aguas, Cacao, 

 April 19 iSchuarz and Barber). (In l'. S. National Museum.) 



Type. Cat. No. L3087, U.S.N.M. 



