54 BULLETIN 18 2, UNITED STATES NATIONAL MUSEUM 



under the femora; abdomen widely margined; sternites of first and 

 second segments not present; femora unarmed, tibiae spinose, fifth 

 segment of hind tarsi longer than first four together. 



Remarks. — This is a boreal genus that is very poorly represented 

 in the American Tropics. At least several of the species described 

 by Sharp from Central America will be found to belong to the 

 genus Phloeonomus rather than to Omalium. 



I have seen 34 specimens, which I assign to 4 species. These are 

 found only in the Greater Antilles. 



KEY TO WEST INDIAN SPECIES OF OMALIUM 



1. Side margins of pronotum distinctly curved up ; lateral depression 



large and deep 4. laborium. 



Side margins of pronotum explanate but not curved up ; lateral 

 depressions feeble or moderate 2 



2. Smooth preocellar ridges very distinct 1. jamaicensis 



Preocellar ridges feeble 3 



3. Intervals of pronotum distinct, shining 2. darlingtoni 



Intervals of pronotum almost invisible 3. cubanum 



1. OMALIUM JAMAICENSIS, new species 



Description. — Bright rufous throughout. Head broadly elevated 

 along middle ; feebly margined above and behind the eyes ; feebly nar- 

 rowed behind eyes to margin, thence abruptly ; ocelli prominent at base, 

 not set off by smooth areas ; punctures moderate but obscured by ground 

 sculpture. Pronotuin one-third wider than long; sides rounded in 

 front, without lateral angle, straight from middle to prominent basal 

 angles ; strongly explanate at the sides but not up-curved ; very feebly 

 f oveate at middle of sides ; disk very vaguely depressed on either side 

 of midline posteriorly ; moderately coarsely and rather densely punc- 

 tate, the intervals narrow and with traces of ground sculpture. 

 Elytra nearly one-third wider than pronotum, one-fourth longer than 

 wide; very feebly explanate at the sides; with coarse punctures, not 

 very dense, but obscured by irregular ground sculpture. Abdomen 

 above with moderately coarse but not dense punctures obscured by 

 dense ground sculpture. Length, 1% mm. 



Type locality. — Jamaica, Yallahs Valley, Blue Mountains. 



Types. — Holotype, American Museum of Natural History, collected 

 by J. A. Grosbeck on February 27, 1911. 



Records. — The following is the only record known to me: 



Jamaica: Yallahs Valley (Grosbeck, in A.M.N.H.). 



Sjyecimens exam-ined. — I have seen only the holotype. 



Remarks. — This species is distinct in numerous characters, such as 

 the shape of the pronotum and the elytra and the punctation and 

 sculpture of the head, pronotum, elytra, and abdomen. 



The type was collected during general sweeping. 



