Key to Scientific Names in Ornithology

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Heteroxolmis

(syn. Xolmis Ϯ Black-and-white Monjita X. dominicanus) Gr. ἑτερος heteros  different; genus Xolmis Boie, 1826, monjita; "By contrast, dominicana, historically an unquestioned member of Xolmis, differs from other Xolmis in a number of very significant characters, the basis for a new genus described below.  Heteroxolmis, new genus  TYPE SPECIES; T[yrannus] dominicanus Vieillot, 1823, p. 856.  ... ETYMOLOGY: From the Greek heteros meaning different or other.  DIAGNOSIS: The syrinx of dominicana ... has internal cartilages that are unique among all flycatchers in being greatly swollen and slightly J-shaped ... The divergence from Xolmis ... greatly exceeds intrageneric variation among tyrant flycatchers and constitute my main argument for proposing separate generic status for this species ... In addition ... the uniquely shaped tenth primary" (W. Lanyon 1986).

NEOXOLMIS

(Tyrannidae; Ϯ Chocolate-vented Tyrant N. rufiventris) Gr. νεος neos  new; genus Xolmis Boie, 1826, monjita; "Neoxolmis genus. nov.  Somewhat like Myiotheretes, but tarsus much longer (about twice as long as middle toe without claw); claw of hallux decidedly longer than its digit; wing relatively longer and much more pointed; outermost primary much longer, equalling or exceeding second; rictal bristles hardly apparent.  Type Tyrannus rufiventris VIEILLOT" (Hellmayr 1927).

POLIOXOLMIS

(Tyrannidae; Ϯ Rufous-webbed Bush Tyrant P. rufipennis) Gr. πολιος polios  grey; genus Xolmis Boie, 1826, monjita; "Polioxolmis, new genus.  TYPE SPECIES: Muscisaxicola rufipennis Taczanowski, 1874  ...  ETYMOLOGY: From the Greek polios meaning ashy-gray, in reference to the predominant color of the plumage" (Lanyon 1986); "It shows some resemblance to Xolmis  ...  If not in Cnemarchus it should have a new genus erected for it. Probably near Xolmis  ...  In fact except for a little more slender bill, it fits best in Xolmis" (Zimmer MS in Lanyon 1986).

XOLMIS

(Tyrannidae; Ϯ White Monjita X. irupero) "X. Fam. Muscicapiadae Vigors.  Muscicapa Lin. 2  ...  2 Ferner könnten als Gattungen abgesondert werden: Knipolegus für Musc. lophotes Tem. und cyaneirostris Vieill. Az. 181; die Peposaza [sic] Az. (Xolmis), die sich in der Lebensweise den Arten der Gattung Oenanthe nähern und die Queues-rares (Xenurus) desselben.  Alle hieher zu stellende Vögel zeichnen sich durch rauhe Stimme und die Gewohnheit aus, auf zweyflüglige Insecten zu lauren, und dieselben im Fluge zu haschen. Sie fitzen vorzugsweise auf dürren Zweigen und Aesten" (Boie 1826); "Gattung Xolmis Pepoazo Azar.  Hieher aus America:  1. Muscicapa moesta Lichst. Az. [= X. irupero]   2. -- vittigera Lichst. Azar. [= X. coronata]   3. -- mystacalis Spix tab. 31. [= Fluvicola nengeta]   4. -- velata Lichst. [= X. velata]   5. -- bicolor Gm. [= Fluvicola pica]   Die Lebensweise dieser weiß und schwarz gefärbten Vögel nähert sich der der Steinschmätzer (Vitiflora Briss.), an die sie sich auch durch die Vertheilung der Farben ihres Gefieders anschließen.  ...  2Ξολμις, Isis 1826 S. 975." (Boie 1828). I cannot find this name in my dictionaries, and David & Gosselin 2002b, list it as a word of unknown origin. It may be a misreading of “Xomotl” of Hernandez 1651: “De Xomotl ... Avis est dorso et alis desuper nigris, ac pectore fusco” (Aztec Xomotl waterbird, perhaps some sort of duck), or perhaps be based on an unrecorded Güaraní name (although not found under “Pepoaza” in de Azara 1802-1805, nos. 201, 202, 203).  
Var. Xolmus.
Synon. Hemipenthica, Heteroxolmis, Hydrozetetes, Nengetus, Pepoaza, Pyrope, Taenioptera.