312 BULLETIN" 182, UNITED STATES NATIONAL MUSEU.M 



of Lathrotaxis^ Lathrohium longlu.'^cuJn G\"A\^\\\\ovQt^=Lathrotaxis 

 longni^cula (Gravenhorst) (designated by Hlackwelder, 1989) ; of 

 Platydoincne^ Lathrohium hicolor 'Eiv\Q[\?,owz=PIa(ydomenr. hicolor 

 (Ericlison) (designated by Blackwelder, 1939) ; of Eulathrobimn. 

 Lathrohium grande J^Coiit^:=Ev2athrohium graride (LeConte) 

 (monobasic) ; of Lathrotro'pis^ T^athrohium jcwohinum LeConte — 

 Lathrotropis jacohitia (LeConte) (designated by Blackvvelder, 1939) ; 

 of Pseudolathra, Lathrohinrn anaJe IjeCont&= Pseifdolathra analis 

 (LeConte) (designated by Blackwekler, 1939) ; of TAyiolafhra^ L. fJi- 

 tarsis Casey (designated by Blackwekler, 1939) ; of Microhithra^ 

 Lathrohium paJlidula ljvConte= Microlathra, paJIidu/a (LeConte) 

 (designated by Blackwekler, 1939) ; of Paratofhra, P. fficonvft Casey 

 (monobasic). 



Diagnosis. — Body elongate, parallel, feebly constricted : i)itegiiments 

 moderately sparsely punctate, not umbilicate; eyes present and nor- 

 mal; antennae posteriorly flexile, not strongly geniculate, basal seg- 

 ment not very elongate, first and second not much larger than rest; 

 Inbnnn bilobed; foui'tli segment of n)axillary palpus acicukir, shorter 

 than the greatest width of tlie third segment; gular sutures separate, 

 variable in position; neck fully one-half as broad as head; prosternum 

 not dilated under coxae; hypomera feebly lobed behind the coxae; 

 interior coxal cavities open behind; front coxae large, exserted; elytra 

 with a longitudinal fold above side margin; middle coxal cavities con- 

 fluent; posterior coxae contiguous, "conical"; firet and second abdomi- 

 nal sternites absent; seventh sternite of male sometimes modified, 

 eighth always emarginate; basal half of anterior tibia with a con- 

 <'avity lined with diagonal ctenidia; apex of posterior tibia with a 

 distinct ctenidium along both inner and outer edges. 



Remarks. — This genus has gener;illy been considered a subgenus 

 of Lathrohhim. It was raised to the rank of genus, distinguished 

 from Lathrohimn by the presence of the elytral fold and containing 

 several subgenera (see Blackwekler, 1939). It includes most of the 

 previously described members of Ibe Lathrobia fi-om the West Indies. 



I have seen 87 exam])les oi this genus fi-om the West Indies. 

 These are assigned to ten species, of which five aie new. 



KEY TO WEST INDIAN SPECIES OF LOBRATHIUM 



1. Elytra normal, not shorter than pvonotnni 2 



Elytra reduced, distinctly shorter than pronotum 8 



2. Median space of pronotum outlined by two definite series of punctures 



(sometimes irregular) 4 



Median .'<paro outlined at most by bands of punctures not arranged in 



single series 3 



o. Seventh sternite of male longitudinally sulcate; piceous, with apex of elytra 



rufescent 1. discolor 



Seventh sternite of male not sulcate; black, with elytra rufous 2. pectorale 



