SUBFAMILY OEDIPODINAE 45 
vent, broadly triangular, with the apex obtuse; lateral carinae distinct, 
median usually present at least in the basal portion; foveolae present, 
though not deep or prominent and usually triangular in form; the 
antennae are not longer than the head and pronotum, filiform and in 
some forms with the joints somewhat flattened, especially in the apical 
half. The pronotum has the disk flat or nearly so and the surface 
distinctly tuberculate or rugose ; the median carina distinct and in most 
of our species cut by but one sulcus, although in H. zapotecus and 
H. tigrinus it is cut by two sulci; the lateral carinae pass the principal 
sulcus without being noticeably cut by it in most species, but are often 
strongly rugose or cristulate at that point. Tegmina exceeding the 
abdomen and usually with at least the apical third quadrately reticulate ; 
the basal area of the wing, in all our species, red or yellow, though blue 
in certain western species, this area usually bounded externally by a 
curved black or fuscous bar of varying width. The hind femora are 
stout, usually considerably dilated at the base, often with the inner 
face more or less marked with bright colors. 
These insects are very similar in general appearance and many 
are dimorphic as to color of wings, thus leading rather easily to con- 
fusion in specific identity. The following key will serve to distinguish 
the species found within our area: 
Rugosities of the metazona arranged in series more or less definitely parallel 
with the hind margin 
Antennae of males not especially attenuate; median carina of pronotum inter- 
sected by only one sulcus haldemani 
Antennae of males attenuate; median carina of pronotum intersected by two 
sulci, the anterior one usually weak tigrinus 
Rugosities of the metazona not definitely arranged into series parallel with the 
hind margin 
Median carina of pronotum intersected by but one sulcus 
Anterior extremity of vertical scutellum not prolonged, narrowing rapidly 
in front YUZOSUS 
Anterior extremity of vertical scutellum prolonged and narrowing very 
gradually in front tuberculatus 
Median carina of pronotum intersected by two sulci; inner face of hind femora 
bright red in whole or in large part sapotecus 
Hippiscus haldemani Scudd. 
Hippiscus haldemani has been much confused with others of the 
genus but may be separated by the arrangement of the rugae of the 
metazona into series more or less definitely parallel with the oblique 
sides of the hind margin. The hind margin of the metazona is right- 
angled in males and obtuse-angled in females. The general color is 
usually a grayish brown variously maculate with dark brown spots. 
The wings are yellow, in all specimens yet taken in this State, and the 
hind tibiae usually yellow, more or less tinged with dull orange. The 
