MONOGRAPH OF WEST IXDIAX STAPHYLIXIDAE 471 



LXXVI. Genus ATANYGNATHUS Jacobson 



Tanygnathus Erichson, lS3Sa, p. 417 (not Wagler). 

 Tanygnutns Eichelbaum, 19(H), p. 159 (misspelling). 

 Atanygnaihus Jacobson, 1909, p. 521. 

 Tanygnathinus Reittke, 1909, p. 105. 



Geriotypes. — Tanygnathus terminalis Erichson (monobasic) (for 

 all three names). 



Diagnosis. — Head and pronotum without dense umbilicate punc- 

 tures, margined beneath the eyes; antennae \Yidely separated at front 

 of head, not strongly geniculate, segments pubescent from the second 

 joint; labrum transverse and densel}' hairy in front; mouth parts 

 much elongate, palpi very long and slender, fourth segment of maxil- 

 lary longer than the third, the labial similar to the maxillary; gular 

 sutures separate; lateral margin of pronotum single; anterior coxal 

 cavities entirely open behind; front coxae large, exserted; posterior 

 coxae contiguous, "triangular," with a small expansion over the base 

 of femur; first and second abdominal sternites absent; femora un- 

 armed except sometimes for a strong comb of setae at the base of the 

 anterior ones; anterior tarsi 5-segmented, middle and posterior 

 4-segmented. 



Remarks. — This is the only American genus of the Quediini (or 

 even of the Staphylininae) that does not have all the tarsi 5-segmented. 

 It is a small genus but occurs all over the world. 



I have seen 82 examples from the West Indies. I assign these to 

 two species, both previously described but one heretofore known only 

 from the original description. 



KEY TO WEST INDIAN SPECIES OF ATANYGNATHUS 



1. Elytral punctures exceedingly fine, somewhat indistinct 2. laticollis 



Elytral punctures not very fine, distinct 1. heterocenis 



1. ATANYGNATHUS HETEROCERUS Cameron 



Atanygnaihus heterocerus Cameeon, 1922, p. 123 (as variety of antennaUs 

 Sharp). — ScHEERPELTz, 1933, p. 1468. 



Description. — Head piceous, pronotum rufopiceous to rufous, elytra 

 and abdomen castaneous to rufocastaneous. Head more or less 

 strongly narrowed behind the eyes; not distinctly punctate except 

 at sides, but with rather indistinct scaly ground sculpture. Pro- 

 nottim over one-fifth wider than long, completely rounded posteriorly 

 and arcuately narrowed in front ; with a single pair of discal punc- 

 tures in front of middle; with ground sculpture as on head but less 

 distinct. Elytra with moderate punctures separated by less than 

 their diameter, bluntly and indistinctly submuricate. Abdomen with 

 fine posteriorly excavated punctures, moderately sparse; without 

 distinct ground sculpture. Length, 4 to 5 mm. 



