MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 155 



denly narrowed. Elytra with four regular costae, interstices finely 

 punctate. Length, 2 mm. (From Erichson.) 



Type locality. — Puerto Rico. 



Types. — Either in the Hope Museum, Oxford, or the Zoologische 

 Museum, Berlin. 



Records. — The following are the records known to me : 



Puerto Rico: (Erichson, 1840; Lacordaire, 1854; Faiivel, 1865; Leng and 

 Mutchler, 1914; Bernhauer and Schubert, 1910; Wolcott, 1924, 1926). 



Specimens examined. — I have seen no specimens that agree with the 

 above description. 



Remarks. — This species should be very distinct by its quadridentate 

 pronotal margins. It has apparently not been collected since it was 

 described. 



Erichson gives no clue to its habits except the statement that this 

 genus is found under bark. 



XIX. Genus ELEUSIS Laporte 



Eleusis I^PORTE, 1834, p. 131. 

 Chasolium Laporte, 1834, p. 132. 

 Isomalus Erichson, 1840, p. 838. 



Genotype. — E. tihiali-s Laporte (monobasic). Of Chasolkim., G. 

 ernestini Laporte (monobasic) ; of Isojnalus^ I. hwnilis Erichson 

 (designated by Duponchel, 1841). 



Diagnosis. — Body slender, parallel, strongly depressed, alate; head 

 irregularly quadrate, abruptly declivous in front, with the clypeus 

 scarcely visible; labrum one-third as wide as head, short, ciliate, ap- 

 parently without appendages; antennae moniliform, nearly as long 

 as head and pronotum, first segment not swollen ; mandible with at 

 least one small tooth; maxillary palpus moderately stout, fourth 

 segment longer and much narrower than third ; labial palpi short and 

 stout; gular sutures united, mentum short and broad, rectangular; 

 pronotum slightly transverse, narrowed behind, edges laterally in- 

 terrupted at basal third only; prosternum long, coxae small, feebly 

 elongate, cavities open behind and confluent ; elytra scarely longer than 

 the mesosternum and metasternum; middle coxal cavities not sepa- 

 rated at the level of the sterna ; posterior coxae approximate, broadly 

 expanded under the femora; abdominal segments margined above; 

 sternites of first and second segments not present; femora and tibiae 

 not dentate or strongly spinose except at tip of latter; tarsi 5-seg- 

 mented, fifth tarsomere as long as four preceding together. 



Remarks. — Only two specimens of one species of this genus have 

 been seen from the West Indies. Since no examples of the genus from 

 Madagascar are available, it is difficult to verify the above synonymy 

 or to be sure that our species is congeneric with the genotype. Numer- 



