474 BULLETIN 18 2, UNITED STATES NATIO'NAL MUSEUM 



basic) ; of TyphJolimis^ Xantholinu>i {TyphloJinua) liungcricn-s 

 Reitter (monobasic) ; of Hypnogyra^ XanthoUrius gula7^^ Le- 

 Conte^Xanfholinii-^ (Ilypnogyra) gularis (LeConte) (designated 

 here) ; of NotoUnopsis, N. capcnsis Casey (designated here) ; of 

 Notolinus^ N. jumipennis Casey (designated here) ; of IdioVniuK^ 

 Xan-tholii)i(,H crassicorn'ts \{oiA'\\\\\i\\ = Idiolhnis crax.sicoiiiiK (TToch- 

 huth) (monobasic) ; of Megallnus^ >Sf((phylin}is glahrafus Graven- 

 \iorsi= Xantholinus (MegaUnus) glabratus (Gravenhorst) (mono- 

 basic) ; of Calo}itholinus^ Xanfholhms {CaloyithoJinus) fasciatus 

 Hochhnth (monobasic). 



Diagnosis. — Head and ))r()notum not densely nmbilicately punc- 

 tate; antennal grooves distinct, ocular grooves absent; antennae 

 inserted close together at anterior margin of head, basal segment 

 generally less than half as long as head, outer segments densely pu- 

 bescent from the fourth joint; labrum small, feebly emarginate; 

 fourth segment of maxillary palpus distinctly longer than third: 

 last segment of labial palpus similar in shape to maxillary; gular 

 sutures united or closely approximate in part; neck generally more 

 than one-third as wide as head ; pronotum with side margin double, 

 the lines always separate; prosternum with a pair of large sclerites 

 in front of the sternite; elytra w^ith suture broadl}^ beveled; middle 

 coxae widely separated; posterior coxae contiguous, "triangular"; 

 first and second abdominal sternites absent or represented only by tiny 

 sclerites at the sides; intei-scgmental membranes of abdomen marked 

 with a pattern of angular areas in longitudinal bands; anterior 

 tarsi not much dilated. 



Remarks. — This genus is distinguished by the sti'ucture of the palpi 

 and the separate marginal lines of the pronotum. It is a world- 

 wide genus and as herein defined is more abundantly represented in 

 the Western Hemis]^here than was thought by Col. Casey. 



The authorship of this genus has apparently been erroneously cited 

 for many years. In the Encyclopedic Methodique (1825, p. 475) 

 Serville gives a key to the grou]^s of Staphylininae and obviously in- 

 tends to propose the genus Xantholinus. However, he fails to give 

 a Latin form to the name and also fails to cite any species. It is 

 therefore impossible to accept his proposal of the genus, although 

 this is the reference cited by all recent writers. The question of ac- 

 cepting this use of the name is, however, not important since it was 

 used at least twice at previous dates. In 1823 Dahl used the name 

 at the head of a list of 8 species, of which 3 or 4 were valid names, 

 and in 1821 Dejean used the name over a list of 21 species of which 

 9 were valid. Although there is no question that new specific names 

 proposed in these lists are nomina niida and not valid, there seems to 



