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Aulocara Group

Crenulated Grasshopper - Cordillacris crenulata Heliaula rufa - female   - Ageneotettix deorum - female Boopedon nubilum - female Boopedon nubilum - female Ebony Grasshopper - Boopedon nubilum - male grasshopper nymph, mainly black and white - Psoloessa texana Grasshopper on desert vegetation litter - Psoloessa texana - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Orthoptera (Grasshoppers, Crickets, Katydids)
Suborder Caelifera (Grasshoppers)
Family Acrididae (Short-horned Grasshoppers)
Subfamily Gomphocerinae (Slant-faced Grasshoppers)
No Taxon Aulocara Group
Synonyms and other taxonomic changes
Roughly equivalent to tribe Aulocarini.
Included within tribe Chorthipini [= Gomphocerini] by several authors.

tribe Amblytropidini; group Phlibostromae G.E. Wixom 1973. Based on genus Phlibostroma S.H. Scudder, 1875 (also included Cordillacris Rehn, 1901)
tribe Amblytropidini; group Horesidotiae G.E. Wixom 1975. Based on genus Horesidotes S.H. Scudder, 1899 (also included Acantherus S.H. Scudder, 1902)
Aulocara Genus Group, Otte, 1981. Based on genus Aulocara S.H. Scudder, 1876
Stenobothrus Genus Group, Otte 1981 [sensu Otte as per North America, but not equivalent to Eurasian tribe Stenobothrini of other authors]. Name based on genus Stenobothrus Fisher, 1853
tribe Aulocarini Otte, 1995
Identification
A varied group of several genera, but probably most are closely related to one another. Medium to quite stocky in build; head rounded, typically larger than pronotum, with face gently slanting to nearly vertical (except in Cordillacris & Horesidotes); fastigium mostly flat to convex (concave toward front in some) with median ridge absent or sometimes faint; lateral faveolae visible from above, sometimes with faveolar area smooth; antennae slender, often very long (especially in males), but somewhat thickened and flattened in Cordillacris & Horesidotes; hind tibiae most often bright reddish, bluish, but sometimes yellow, brownish, purple, or black; hind femur mostly rather stocky and thick (slender in Cordillacris & Horesidotes); usually with distinct dark bands or spots at least on top side of hind femur; tegmina relatively slender or wings short; hind wings transparent and most often bluish.
Range
Probably entirely in the Americas, mostly North America, but some similar genera in Eurasia may be closely related.
Remarks
Most of these genera have at times been placed in tribes Chorthippini or Gomphocerini (which are equivalent to one another in many treatments), but those represent a different primarily Eurasian group of genera that is poorly represented in North America. The classification of genera within the subfamily Gomphocerinae has varied considerably from author to author, and is in a state of change as molecular studies help to reveal relationships. This will certainly result in some major rearrangements in groupings of genera. This grouping is perhaps not entirely a natural one, but for now it is convenient to group these mostly "big-headed" grasshoppers together.
They are mostly insects of open dry grasslands, where many are more inclined to rest on bare ground as apposed to vegetation. Most species with wings will fly low to the ground for short distances when disturbed.
Cordillacris & Horesidotes seem a bit out of place here, but their closest kinship seems to be with members of this group, and they may simply be more slender than average for the group. They have been associated with other groups of genera by some authors, but they do not fit well into any other groupings. Perhaps they should represent a group of their own?
There are other potential associations for some of the genera listed here. For instance, some species of Psoloessa shows distinct similarities to certain species of Eritettix (coloration, mostly early spring occurrence, behavior, habitat choices, etc.).