260 BULLETIN 1S2, UNITED STATES NATIONAL MUSEUM 



dehilicornh Wo\h\ston= nypo77iedon dehilicornis (Wollaston) (des- 

 ignated by Blackwelder, 1939a) ; of Ilemhnedon., H. i-uppes Casey 

 (designated by Blackwelder, 1939a) ; of Lena^ L. testacea Casey (mon- 

 obasic) ; of Caloderma, C. rugosa Casey (designated by Blackwelder, 

 1939); of Trax;hysectus, Lafhrohium confiuentum S-2iy =Trachysectus 

 confluentus (Say) (monobasic and original designation). 



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

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

 teriorly flexile, not strongly geniculate, basal segment not much 

 elongate, first two not much larger than the rest ; laln-um without 

 median denticle, with or without a pair of denticles near middle; 

 fourth segment of maxillary palpus very small, subulate; gular su- 

 tures not at all united, moderately distant, most approximate anteri- 

 orly; punctures of pronotum similar to head in general; prosternum 

 not carinate on disk, prolonged between coxae as far as mesosternum 

 but not much dilated under coxae; hypomera prolonged in a short 

 lobe partially behind coxae; anterior coxal cavities open behind, con- 

 fluent; front coxae very large, exserted; middle coxal cavities conflu- 

 ent; posterior coxae contiguous, "conical''; first and second abdominal 

 sternites absent, third carinate at base, seventh and eighth not modified 

 in either sex (unless males are unknown) ; anterior tarsi slender. 



Remarks. — Although the distinguishing characters of this genus are 

 not very pronounced, it seems desirable and justifiable to recognize 

 the variations within the old genus Medon by forming several genera, 

 each of which has groups of species that can with propriety be made 

 subgenera. 



The name Uyfomedon was at first adopted for this genus. When 

 it was found th:it the r.ame Sun'nis of Stephens was the valid nnme 

 of one of the subgenera (previously cited under the name OJigop- 

 tenis) , it became necessary to use the older name for the genus. 



The subgenera Hypomedon and Galoderma are the only ones besides 

 the typical subgenus which have been found in the AYest Indies. 

 The subgenus Sunius s. str. differs from both of these in having the 

 head and pronotum sparsely punctate and shining. The subgenus 

 Galoderma diff'ers from Ilypomcdon in having the umbilicate punc- 

 tures dense and in the absence of ground sculpture. The species 

 Medovella minufa was described by Casey as possessing four denticles 

 on the labrum. I am unable to see more than two on either of the 

 types and therefore place the name Medondla as a synonym of 

 Sunius 9. str. 



A "cotype" of Xenocharis occipitalis Bierig in the United States 

 National INIuseum leaves no doubt that the genus Xenocharis is a 

 synonym of Sunius s. str. Before receipt of this specimen I had 



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