308 BULLETIX 18 2, UNITED STATES NATIONAL MUSEUM 



Genotypes. — Sta'phylinus elongatus 'Lhmsiens= Lathrohium elonga- 

 tmii (Linnaeus) (designated by Lutreille, 1810; since this is a valid 

 designaiion, that of des Gozis in 1886 of multipunctum is invalid). 

 Of Centrocnemw., Lathrohium (Centrocnemis) krnien.se Joseph 

 (monobasic) ; of Litolnthra, L. suspecta Casey (designated by Black- 

 welder, 1939) ; of Lathrolepta, Lathrohium, dehilis LeConte=Za^Aro- 

 lepta dehilis (LeConte) (monobasic) ; of Deratopcus., D. parvipennis 

 Casey (designated by Blackwelder, 1989) ; of Tefartopeus, Lathro- 

 hium terminatuni Gi'Si\er\h.orst= Lathrohimn {Tetartopeus) termina- 

 tum Gravenhorst (designated by Blackwelder, 1939) ; of AhJetohium, 

 A. pallescenj^ Casey (monobasic) ; of Apteralium.^ Lathrohium, hrevi- 

 penne IjeConte= Apteraliimi hrevipenne (LeConte) (designated by 

 Blackwelder, 1939) : of Lathrohiopsis\ L. texana Casey (monobasic) ; 

 of Lathrohioma., iMthrohiurti tenue 'LeContQ = Lafh/'ohioma tenuis 

 (LeConte) (designated by Blackwelder, 1939). 



Diagnosis. — Head with punctures not very dense, not coarsely 

 umbilicate; eyes normal; antennae posteriorly flexile, not strongly 

 geniculate, basal segment not very elongate, outer segments normal ; 

 labrum bilobed or triangularly emarginate; fourth segment of maxil- 

 lary palpus small, acute, glabrous, not compressed, shorter than 

 greatest width of third; neck over one-fourth as wide as head; pros- 

 ternum not dilated under the front coxae as far as the hypomera ; 

 anterior coxal cavities entirely open behind; elytra without a fold 

 above side margin; first and second abdominal sternites absent; 

 apex of posterior tibia with a distinct ctoiidium on both sides. 



Remarks. — This genus is distinguished from Lohrathium- by the 

 lack of a lateral fold on the elytron. It is a large genus but is repre- 

 sented in the West Indies by only four species, of which three appear 

 to be new. I have seen only five examples. 



KEY TO WEST INDIAN SPECIES OF LATHROBIUM 



1. Piinctiires on disk of pronotxim three times as large as those on head. 



2. canoaensis 

 Punctures of prouoLum not much lai'ger than those on liead 2 



2. Elytra shorter than pronotum 3 



Elytra longer than pronotvun 1. trinitatum 



3. Basal angles of head distinct 4. subterraneum 



Basal angles of head broadly rounded 3. dominicanum 



1. LATHROBIUM TRINITATUM, new species 



Description. — Testaceous, head and pronotum more or less rufes- 

 cent. Head truncate behind, with hind angles narrowly rounded; 

 with rather feeble punctures not very dense except at base ; without 

 ground sculpture except near base; gular sutures distinctly separated 

 along middle and equally divergent to base and apex. Pronotum 

 with irregular median smooth area not outlined by a distinct series 



