420 BULLETIN 182, UNITED STATES NATIONAL MUSEUM 



Specimens examined. — ^I have seen 14 examples in the United States 

 National Museum, 4 from the Museum of Comparative Zoology, 1 in 

 the collection of the Service Technique in Haiti, 1 in my own collec- 

 tion, 10 collected by Dr. H. E. Box in 1937, 4 collected by H. A. 

 Beatty in 1938, and 18 collected by me during 1935-37. 



Remarks. — This species is very variable in the details of sculpture 

 and punctation as well as in the shape and extent of the male char- 

 acters. It may be distinguished by the number of punctures in the 

 pronotal series and the shape of the pronotum. 



My specimens were collected from dung, the muddy banks of 

 ponds, the rotting "fruit" of an imported palm, and flying at dusk. 

 The examples from Dr. Box were taken "among decaying forest debris 

 in Inga I-atmna forest in mesophytic (volcanic) district." 



LXIV. Genus BELONUCHUS Nordmann 



Belonuchus Nordmann, 1836, p. 129. 

 Trapczideriis Motschxtlsky. 1859, p. 77. 

 Musicodertis Sharp, 1885, p. 455. 



Genotypes. — Staphylinus haetiiorrhoidalis Fabricius =^ Belonuchus 

 haemon^hoidalis (Fabricius) (monobasic). (Misspelled haemoroi- 

 dalis by Nordmann.) Of Trape:2ideni-'<, T- hicoJor Motschulsky 

 monobasic) ; of Mimcodems, M. cephalotes Sharp (desiiinated here). 



Diagnosis. — Head without dense umbilicate punctures, not mar- 

 gined beneath the eyes; antennae widely separated at front of head, 

 outer segments pubescent from fourth segment; labium bilobed; 

 palpi elongate and slender, fourth segment of maxillary longer than 

 third, labial similar to maxillary; gular sutures united from before 

 middle, at least in the males; lateral margin of pronotum double, the 

 lines united near coxal articulation; anterior coxal cavities entirely 

 open behind; front coxae large, exsertod; posterior coxae contiguous, 

 "triangular"; first and second abdominal sternite? absent; interseg- 

 mental membranes of abdomen with a pattern of irregular rounded 

 sclerotized areas arranged in longitudinal rows; front femora gen- 

 erall}' finely, and posterior generally coarsely spinose. 



Remarks. — This genus has always been separated from PhUonthus 

 in an unsatisfactory manner. The spinosity of the posterior femora 

 is more constant than that of the anterior femora but yet does not 

 hold throughout. The gular sutures have here been found to be 

 fairly satisfactory for this purpose, since in Ph'ilonthits (at least in 

 the West Indies) these sutures are either separate throughout or 

 united well behind the middle. 



In counting the ])unctures in the discal ])ronotal series I have not 

 tried to follow a set rule but have included any marginal puncture 

 that is in the proper position to fall within the series. If the marginal 



