SI P.FA.MILY III. LOCUSTIN.E. 309 



the stem firmly with its short front and middle legs, it draws its 

 slender hind femora close up against the body, and folding the 

 t-ibise into position, hugs its support as closely as possible, and re- 

 mains perfectly motionless. Its body is almost cylindrical, and 

 being of the same general color of the plant on which it rests, it is 

 almost impossible to detect it, unless one notes exactly where it 

 alights. Eight times out of ten a person, by approaching quietly, 

 can reach his hand about the plant stem and grasp the insect. Its 

 habits thus excellently illustrate the so-called "protective mimi- 

 cry'' of form and coloring, as it always seems to choose a cylindri- 

 cal object, and one similar to its own color before alighting. 



Aside from the localities above mentioned, L. marginicollis has 

 been recorded from numerous other stations in Florida and doubt- 

 less occurs in suitable environments throughout the mainland of 

 that State. About Dunedin both adults and nymphs occur 

 throughout the winter on and among the brown stems of tall 

 sedges and grasses along the borders of ponds and marshes. A 

 half dozen or more specimens of the pink individuals are taken 

 each winter around the borders of a certain wet-weather pond. 

 According to Dr. Hancock, these are the first pink Acridians 

 which have been noted in the United States. The species ranges 

 from Maryland and Virginia, west to southern Indiana and Ne- 

 braska, and south and southwest to Florida, Texas and Southern 

 California. 46 



II. STENACRIS F. Walker. 1870, 651. (Gr., "slender" -f "locust") 

 Very slender, subcylindrical species, having the fastigiuni 

 short, blunt, separated from the vertex by a transverse groove, its 

 margin not raised, apex rounded; frontal costa shallowly sulcate, 

 its margins parallel throughout; eyes elliptical, oblique; antennae 

 feebly ensiform. slightly shorter than head and thorax together; 

 pronotum subcylindrical, its disk granulate-punctate, cut by three 

 sulci, median and lateral carinre wholly wanting, metazona two- 

 thirds the length of prozona; lateral lobes as in Leptysma; teg- 

 mina narrow, nearly as long as body, strongly surpassing the ab- 

 domen, their tips acute; hind femora slender, shorter than ab- 

 domen, male, reaching its tip, female; prosternal spine stout, cyl- 

 indrical, obtuse; subgenital plate of male with median portion 

 prolonged, subspatulate, each side produced into a distinct spine 

 or cusp; valves of ovipositor short, feebly exserted, the upper ones 

 strongly serrate above. 



This generic name replaces Arnilia Stal (1873). Eleven spe- 



"Scudder, Psyche, IX, 1900, 116. 



