MONOGRAPH OF WEST INDIAN STAPHYLINIDAE 255 



Type locality. — Puerto Rico, 2 miles north-northwest of Villalba. 



Types. — Holotype, male, and 14 paratypes, 5 males and 9 females, 

 U.S.N.M. No. 52400, collected in 1935-37 by Chapin and Blackwelder. 

 The paratypes are from Villalba and the localities mentioned below. 

 Also three paratypes in the Museum of Comparative Zoology, from 

 Cuba, Jamaica, and Haiti. 



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



Cuba: Soledad (Darlington, in M.C.Z.). 



Jamaica: (Wight, in M.C.Z.), May Pen (Blackwelder station 425C), Milk River 



(Blackwelder station 415), Santa Cruz (Blackwelder station 421), Newport 



(Blackwelder station 412A). 

 Hispaniola: Haiti, Dessalines (Darlington, in M.C.Z.). 

 Puerto Rico: Villalba (Blackwelder station 62), Adjuntas (Blackwelder station 



49), Ensenada (Dozier, in U.S.N.M.). 



Specimens examined. — I have seen only the 18 types. 

 ReTuarks. — This species is very distinct by the male characters as 

 well as by the sculpture of the head. 

 My specimens were collected from horse manure and flying at dusk. 



XXXIV. Genus STILOMEDON Sharp 



Stilomedon Shabp, 1886, p. 565. 



Subgenus Polymedon Casey, 1905, pp. 151, 155. 



Genotype. — Lithocharis connexa Sh.Sir'p='Stilo7nedon connexum, 

 (Sharp) (designated by Blackwelder, 1939). Of Polymedon^ Lith- 

 ocharis tdbacina Casey— Polymedon tdbacinimh (Casey) (original 

 designation and monobasic). 



Diagnosis. — Body elongate, moderately convex; punctures of head 

 densely umbilicate, with or without ground sculpture; antennae pos- 

 teriorly flexile, not strongly geniculate, basal segment not much 

 elongate, first two not much larger than rest; labrum with median 

 tooth and one or two pairs of denticles; fourth segment of maxillary 

 palpus very small, subulate; gular sutures not at all united but 

 narrowly separated, feebly diverging in front ; punctures of pronotum 

 normal, not umbilicate or tuberculate, without dense ground sculpture; 

 prosternum not strongly carinate, prolonged between coxae as far 

 as mesosternum but not much dilated under coxae; hypomera pro- 

 longed in a short lobe partially behind the coxae; anterior coxal 

 cavities open behind, confluent; front coxae very large, exserted; 

 middle coxal cavities confluent; posterior coxae contiguous, "conical"; 

 first and second abdominal sternites absent, third carinate at base; 

 seventh sternite not modified in either sex, eighth feebly emarginate 

 in male only. 



Remarks. — The comparison of the genotypes of Stilomedon and 

 Polymedon shows them to be very similar in structure though differ- 

 ing moderately in facies, principally in the shape of the pronotum. 



