312 FAMILY VI. ACRIDID^E. THE LOCUSTS. 



deep, V-shaped; tegmina normally dark purplish-brown; fe- 

 male larger, 50 60 mm. in length. 136. OBSCURA. 

 bb. Antennae of male not more than one-fifth longer than head and 

 pronotum together; anal or dorsal area of tegmina without dis- 

 tinct pale stripe; size smaller, the female rarely exceeding 42 

 mm. in length; notch of male suhgenital plate deep, narrowly 

 V-shaped. 



e. Form short, stocky; tegmina of female reaching only base of 

 ovipositor and tips of hind femora, usually immaculate. 



137. DAMNIFICA. 



ee. Form more slender and more compressed; tegmina in both 

 sexes distinctly surpassing abdomen and tips of hind femora, 

 those of female usually sprinkled with numerous fuscous 

 spots. 137a. CALIDIOR. 



134. SCHISTOCEECA AMERICANA" (Drury), I, 1773, 128. American Locust. 



Size large, the female often two inches or more in length, the male 

 distinctly smaller; form rather slender. Color reddish-brown, often with 

 a slight vermilion tint; dorsal surface with a yellowish stripe extending 

 from vertex along the middle of head, pronotum and anal area of tegmina 

 as far as the tip of the abdomen; side of head with a dark brown line run- 

 ning from lower side of eye down the cheek; lateral lobes of prozona with 

 a broad yellowish stripe on upper third, a short and narrow yellow dash 

 near the center, the lower margin yellowish. Tegmina with numerous 

 large dark brown spots, separated by light interspaces; the costal or lower 

 margin whitish-yellow, mottled with darker. Wings transparent, the 

 nerves of basal portion yellowish. Outer face of hind femora reddish- 

 brown, with one or two dark streaks along the upper third. Hind tibiae 

 vermilion red, duller in dried specimens; the spines yellow, tipped with 

 black. Vertex hexagonal, the disk a little depressed. Frontal costa broad, 

 prominent, silicate near middle below the ocellus; feebly narrowed below 

 point of union with vertex. Antennae but little, if any, longer than head 

 and pronotum together. Disk of pronotum flat on metazona, the sides 

 rounded and feebly sloping on prozona, the surface marked with minute 

 shallow cells, or densely punctate, the hind margin obtusely rounded. Teg- 

 mina exceeding the abdomen one-fourth or more their length in both sexes. 

 Hind femora slender, reaching or slightly exceeding tip of abdomen. 

 Spine of prosternum large, curved somewhat backward. Notch of subgen- 

 ital plate of male narrow, deep. Length of body, $, 39 42, 9, 48 55; 

 of antennae, $, 1213, 9, 1315; of pronotum, <$ , 9, 9, 11; of tegmina, 

 $, 4244, 9, 5057; of hind femora, $, 2325, 9, 2830 mm. (Fig. 113.) 



Tliis is the largest locust found in Indiana, and when freshly 



"Hebard (ipisb, 406) has replaced the long used specific name of this well known 

 locust with that of serial-is Thunb., basing his replacement on the ground that the Libel- 

 liila americana of Drury, an Orthopteron, was preoccupied by Libelhila americana L., a 

 dragonfly. The placing of the locust under Libelhila was an error by Drury and was 

 later corrected by him. The error was not in the text but only occurred in using ditto 

 marks on a plate on which the name Libellula had been used for a series of dragonflies. 

 When amcricana, the specific name of the locust, was reached, a ditto mark instead of 

 the name Gryllits was by mistake placed under the generic name Libelhila. This was an 

 obvious typographical error and was open to the correction made by Drury in a footnote 

 on page XVIII, Volume III, of the same work. I, therefore, prefer to retain the name 

 americana, believing that in time its use will be upheld by the International Commission 

 of Zoological Nomenclature. 



