288 REPORT OF STATE GEOLOGIST. 



pronotum, tapering; the joints flattened. Pronotum almost cylin- 

 drical, the metazona a little the wider, the front margin truncate, 

 the hind margin broadly rounded; the median carina very low; dis- 

 tinct only on the metazona; lateral carinae obsolete. Lateral lobes 

 of pronotum longer than wide; the front margin oblique, the hind 

 margin concave, the lower margin sinuate. Prosternal spine short 

 and rounded. Tegmina fully developed, the apical third gradually 

 narrowed. Hind femora very slender, a little shorter than abdomen 

 in both sexes. Ccrci of male slender, tapering and bent abruptly 

 upward and forward near the base. Sub-genital plate narrow, up- 

 turned and tapering to a point. Upper valves of ovipositor much 

 longer than lower ones, their upper margins with a row of prominent 

 teeth. 



But one species of the genus occurs in the United States. 



54. Leptysma maroinioollis (Serville). The Slender-bodied Locust. 

 Opsomala marginicoUis Serv., 196, 1839, 591. 

 Opomnla marginicoUi.'i Tliom., 206, V, 1873, 66, 196. 

 Loptysmn mmginicoUi^ Stal, 200, 187B, 86; Comst., 4 1, 1888, 111, 



Fig. 102; Id., 42, 1805, 111, Fig. 128; Bl., 6, XXIV, 1892, 28; 



Id., 1 1, XX\a, 1894, 221; Id., 16, 1899, 241, Fig. 68; Scudd., 



188, 1900, 47; Id., 190, IX, 1900, 116. 



Ground color of living specimens light yellowish brown or fawn; 

 unbroken except by a narrow, yellowish stripe, extending from the 

 hind border of eye along the lower edge of pronotum to coxa of hind 

 leg. In living specimens this line is bordered above by one of dark 

 brown. When the insect is dried the brown and the tips of tegmina 

 become darker. 



Face, vertex, occiput and pronotum, densely punctured. Tegmina 

 exceeding the abdomen by 3 to 5 mms. Wings transparent, equal to 

 tegmina in male, slightly shorter in the female. 



Fig. 61. Leptyxma marainicollia (Serv .) . (After Comstock). 



Measurements: Length of body, male, 28 mm., female, 32 mm.; 

 of antennae, male, 8 mm., female 6 mm.; of pronotmn, male, 5 mm., 

 female, 6 mm.; of tegmina, male, 20 mm., female, 26; of hind femora, 

 male, 14 mm., female, 17.5 mm. 



This slender bodied, graceful species, has as yet been taken only in 

 Vigo Count}'-, where, in October, 1892, it was found to be common on 



