NEW AMERICAN SCOLYTOID BEETLES — BLACKMAN 381 



smaller and obscurely granulate behind, without hairs or with a very 

 few minute ones on anterior disk ; declivity originating at about middle, 

 gradually, arcuately sloping, interspaces with rounded granules and 

 with short, stout, cinereous hairs. 



Type locality. — St. Croix, Virgin Islands. 



Host. — Unknown. 



Type material.— Roloiy^Q, U. S. N. M. No. 56558. 



The holotype was collected by H. A. Beatty. 



Genus HEXACOLUS EichhofiF 



HEXACOLUS SWIETENIAE, new species 



Plate 1G, Figures 20-24 



Male. — Very dark reddish brown, with basal two-thirds of prono- 

 tum and a stripe on each elytron lighter reddish brown ; 1.93 mm. long, 

 2.11 times as long as wide; intermediate in size between Hexacolus 

 cecropii Schedl and H. hlundfordi Schedl. 



Frons (fig. 23) subimpressed, shining, reticulate, with few very fine 

 punctures and small hairs, surface usually almost entirely hidden by 

 a dense veil of long yellow hairs extending orad from vertex, epistoma 

 impressed at each side, elevated in median line, with moderately long 

 hairs from oral margin. Eye large, elongate, ovate, facets rather fine, 

 inner line feebly sinuate. Antenna (fig. 21) with scape club-shaped, 

 2.66 times as long as the 6-segmented funicle and slightly longer 

 than the obovate club, which has a half septum on first suture. 



Pronotum nearly as long as wide, widest at middle ; posterior out- 

 line bisinuate, margined toward sides, posterior lateral angles strongly 

 rounded; sides strongly margined for three-fourths of their length, 

 arcuate, weakly behind, strongly anteriorly, very broadly rounded in 

 front ; surface shining, very dark reddish brown in front, much lighter 

 behind with darker shade extending farther back in median area; 

 surface with rather strong, low, transverse asperities anteriorly, which 

 become lower and finer on posterior half, where they are reduced to a 

 slightly elevated anterior rim to each fine puncture ; interstices finely, 

 distinctly reticulate; vestiture minute and scanty, to be seen only in 

 certain lighting. 



Elytra slightly wider than pronotum and 1.36 times as long, 1.21 

 times as long as wide ; bases sinuate, distinctly margined, sides weakly 

 arcuate on anterior two-thirds, then more strongly, arcuately narrowed 

 to the moderately narrow apex, extreme apex emarginate at suture, 

 exposing last abdominal tergum; surface brightly shining, convex, 

 much more strongly behind, appearing glabrous but with minute 

 hairs on interspaces; color dark reddish brown in median area and 

 on extreme sides, with an undefined light-reddish-brown area on disk 



