MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 279 



Specimens examined. — I have seen 12 examples in the British Mu- 

 seum and 13 in Dr. Cameron's collection under the name unvhra Sharp. 

 Six more are in the United States National Museum, and 16 were 

 collected by Chapin and Blackwelder in February 1937. 



Reiriarksi. — This species is apparently widely distributed although 

 imperfectly collected. It belongs in the subgenus Leucorus. 



The types were collected from under seaA^'eed and flying at dusk. 



XXXVIII. Genus SCOPAEUS Erichson 



Scopaeus Erichson, 1840, p. 604. 



Polyodontus Souer, 1849, p. 310 . 



Scoponcus MoTSCHULSKY, 1858a, p. 641. 



Leptorus Casey, 1880b, pp. 217, 220. 



Scoponaeus Eichelbaum, 1909, p. 150 (emendation). 



Pseudonis Casey, 1910, p. 190. 



Scopoeonens Cameron, 1934, p. 79 (misspelling). 



Scopaeoiieus Cameron, 1940, p. 89 (misspelling). 



Subgenus Scopaeodera Casey, 1886b, p. 217. 



Subgenus Scopaeopsis Casey, 1905, p. 191. 



Subgenus Scopacoma Casey, 1905, p. 191. 



Genotypes. — Paederus laevigatus Gy\\Q\\\\^\= Scopaeus la-evigatus 

 (Gyllenhal) (designated by Duponchel, 1841; designation of S. didy- 

 iiuis Erichson by Blackwelder, 1939, in error). Of Polyodontus^ P. 

 angustatiis Solier (monobasic) ; of Scoponeus, S. testaceus Motschul- 

 sky (designated by Blackwelder, 1939) ; of Leptorus., Scopaeus exiguus 

 'EiV\c\\son= Leptorus exiguus (Erichson) (designated by Blackwelder, 

 1939; the designation of texanus Casey by Tottenham, 1939 

 was subsequent to the above and therefore invalid) ; of Psevdorus, 

 P. prolixipennis Casey (designated by Blackwelder, 1939) ; of Sco- 

 paeodera, Echiaster nitidus LeConte = Scopaeodera nitida (LeConte) 

 (designated by Blackwelder, 1939) ; of Scopaeopsis., Echiaster opacus 

 LeConte = Scopaeopsis opaca (LeConte) (designated by Blackwelder, 

 1939) ; of Scopaeoma^ Scopaeus rotundiceps Casey = Scopaeoma ro- 

 tundiceps (Casey) (designated by Blackwelder, 1939). 



Diagnosis. — Body generally slender and strongly constricted ; head 

 finely punctate; vertex not carinate in males; antennae posteriorly 

 flexile, not strongly geniculate, basal segment not very elongate, first 

 and second not much larger than rest; labrum bidentate or quadri- 

 dentate, not very deeply emarginate; fourth segment of maxillary 

 palpus subulate; gular sutures always separate; neck one-fifth to one- 

 eighth as wide as head; prosternum somewhat dilated under the coxae 

 but widely separated from hypomera; hypomera somewhat lobed 

 behind the coxae; front coxal cavities separate, open behind; front 

 coxae large, exserted; middle coxal cavities confluent; posterior coxae 

 contiguous, "conical"; first and second abdominal sternites absent; 

 fourth and fifth sternites of male sometimes with a transverse fold or 



