284 FAMILY VI. ACRIDIDJE. THE LOCUSTS. 



verging but not meeting either before or behind, the hind border 

 therefore sub-obsolete; median carina evident but faint; foveolse 

 short, broadly triangular; eyes of moderate size, strongly convex; 

 frontal costa narrow, sulcate throughout, male, below the antennae, 

 female, sides parallel, feebly converging at junction with vertex; 

 antennae filiform, one-half or more longer than head and prono- 

 tum together, male, one-fourth, female; prozona rather strongly 

 constricted, its front margin truncate ; metazona wide, flat, nearly 

 smooth, its hind margin strongly obtuse-angled; median carina 

 very low, cut in front of middle by the principal sulcus (Fig. 96, 

 d) ; prozonal portion slightly the higher, sinuate, rarely feebly 

 cut by the first transverse sulcus ; lateral lobes deeper than long, 

 front margin vertical, hind one nearly so, lower one as in Dissos- 

 teira; tegmiua and wings narrow, the latter colored as shown in 

 Fig 104 ; hind femora slender, slightly surpassing tip of abdomen, 

 male, reaching tip or a little shorter, female ; hind tibiae in great 

 part red ; valves of ovipositor slender, but feebly exserted. One 

 species and a geographic race occur in the Eastern States. 



KEY TO EASTERN FORA1S OF SCIRTETICA. 



a. Basal third or more of wings pale sulphur-yellow; hind tibiae with 

 both pale and fuscous rings near base usually well defined. 



123. MARMOBATA. 



aa. Basal third or more of wings orange or chrome-yellow; hind tibia? 

 without distinct fuscous ring behind the pale one, the latter poorly 

 defined. 123a. PICTA. 



123. SCIRTETICA MARMORATA (Harris), 1841, 145. Northern Marbled Locust. 



Color exceedingly variable, usually ash-gray, more or less mottled and 

 barred with brown and fuscous; sometimes bright reddish-brown or the 

 hue of hematite. Face usually gray with dark spots; occiput brown with 



gray spots; antennae dull yellow at base, apical 

 third darker. Pronotum grayish-yellow with a 

 black bar behind eye and another below, or black- 

 ish-fuscous with pale blotches; sometimes reddish- 

 brown with lower sides only pale; often with a 

 broad x-shaped dull yellow mark on disk Teg- 

 mina usually brown or blackish, with two or three 

 large subquadrate pale spots on apical two-thirds 

 wing g ofmale of "s" mar- of costal field, the basal one the longer; often 

 morata. (After R. & H.) grayish, thickly mottled with fuscous dots and 

 blotches. Front and middle femora gray, annulate with fuscous; hind 

 femora dull yellow with two or three curved fuscous bars on outer face; 

 within yellow with three black bars. Hind tibiae with pale ring at base, 

 followed by dark one of equal width, apical half or more coral-red. Undex 

 surface dull yellow. Structural characters as above given. Length of 

 body, $, 1519, 9, 22 25; of antennae, $, 10.512.5, $, 9.510.5; of 



