NO. 1530. THE DECTICIN.E OF NORTH AMERICA— CAUDELL. 351 



ANABRUS Haldeman. 



Anahrns IIaldemax, Staiisb. P.xpl. Utah, 1852, p. ;!71. — Herman, Verhaudl. der 

 k. k. zool.-bot. Gesellsch. Wien, XXIV, 1874, pp. 200, 209.— Tjioma^, 2(1 

 Kept. IT. S. Ent. Comin., 1880, p. 169.— Kikby, 8yn. Cat. Orth., II, 1906, 

 p. 191. 



Description. — Head moderately large and prominent, quite deepl}- 

 inserted into the pronotum; eyes rounded and moderate!}' prominent; 

 vertex quite prominent, about one-third as broad as the interocular 

 space. Pronotum large and much produced posteriorly; lateral 

 carinas not indicated on the anterior half, posteriorly present but 

 blunt or obscure; median carina present on the posterior portion only 

 and there very obscure, sometimes scarcely discernible; disk smooth, 

 evenly rounded transversely on the anterior half^ posteriorly some- 

 what flattened, a slight transverse sulcus across the anterior portion, 

 usually scarcely noticeable and never conspicuous, and marked near 

 the middle with a V-shaped sidcus or depression, usuall}' quite notic- 

 able; anterior margin of the disk truncate, the posterior margin sub- 

 truncate or broadly rounded; lateral lobes well developed, posteriori}^ 

 sinuate. Prosternum unarmed. Wings of female broad, nearly but 

 not quite meeting on the dorsal line but wholl}" concealed beneath the 

 pronotum; of male overlapping, strongly convex and projecting 

 slightl}^ beyond the pronotal disk. Legs short and stout, the posterior 

 femora less than two times as long as the pronotum, except in ^i. loiu/ipes, 

 and armed below on both margins with from one to several small 

 spines; anterior tibias variable in armature, the outer side armed with 

 from three to live, usually four or five, spines and the inner side 

 unarmed or, usualh", armed Avith from one to three spines, the usual 

 number being one or two. Abdomen plump, not carinate. Cerci 

 simple and conical in the female, in the male apically flattened and 

 furcate, the branches forming two sharp incurved claws; sul)genital 

 plate apically broadly notched in both sexes, in the female with acute 

 angles and at the base on each side with an apically rounded lobe 

 which may be designated as the subgenital lobes; supraanal plate 

 triangular, usually almost hidden, especially in the male; ovipositor 

 varying in length from a little shorter to considerably longer than the 

 posterior femora and curved slightly and quite uniformly upA^ard, 

 rarely straight. 



Ti/pe. — Aiiabrns simplex Haldeman. 



The members of this genus and the one following comprise the only 

 injurious members of our Decticin». Hordes of Aiiahrus at times 

 invade cultivated areas in the western United States and do immense 

 damage. The}^ are known by several common names, among which 

 are great plains cricket, western cricket, war cricket, army cricket, 

 mormon cricket, Idaho cricket, coulee cricket, and Idaho devil. This 



