NO. 1530. THE DECTICIN.E OF NORTH AMERICA— CA UDELL. 363 



Dexcriptlon. — Head large and broad, slightly broader than the pro- 

 notuni and quite prominent, vertex moderately prominent one-third a.s 

 broad as the interocular space; eyes rounded, scarcely proniip.ent. 

 Pronotum large, posteriorly moderately produced, lateral lobes well 

 developed, moderately declined and posteriorly sinuate; lateral and 

 median carin.e present, dull but persistent, the former converging 

 somewhat near the middle of the anterior fourth; disk scabrous, 

 without distinct transverse sulci, truncate both in front and behind, 

 sometimes slightly rounded or angulate ])ehind. Abdomen plump, 

 distinctly ca^'inate dorsally. Legs short, the posterior femora less 

 than two times as long as the pronotum, unarmed below or, rarel}', 

 with one or two ver}" obscure short spines; anterior tibife armed 

 above on the outer side only with from three to five spines. Wings 

 as in Andlyrim. Cerci of the female somewhat compressed basally, 

 spically acute; of the male large, stout, apically somewhat depressed 

 and l)roadened, the inner apical angle forming a short tooth with a 

 sharp naked point (tig. 53); suligenital plate of the male apicall}- 

 triangularly incised, of the female with the apical incision somewhat 

 broader with the lateral angles acute, somewhat as in Analmtst^ and 

 like that genus furnished at the base with a pair of subgenital lobes 

 which, however, are here sharply angulate instead of rounded; supra- 

 anal plate as in Anahrt/s. Ovipositor curved moderately upwards and 

 consideral)ly longer than the posterior femora. 



Type. — Tlimnnotrizon HcalrricoWis Thomas. 



This genus very much resembles in general form the genus Aiiahru)^. 

 The scabrous pronotal disk, the shape of the male cerci, and the arma- 

 ture of the anterior tibite will serve to easily separate it from that 

 genus. We have but one known species. 



PERANABRUS SCABRICOLLIS Thomas. 



Thamnotrizon scabricoUis TnoMAfi, Ann. Rept. U. S. Geol. Siirv. Terr., V, 1872, 

 p. 441.— Glover, 111. N. A. Ent., Orth., 1872, pi. xiii, fig. 6. 



Peranahrus scahricollis Scudder, Can. Ent., XXVI, 1894, pp. 181, 18;!; Cat. Orth. 

 U. S., 1900, p. 77.— Piper, Bull. No. 46, Div. Ent., U. S. Dept. Agric, 1904, 

 pp. 60-61.— Snodgrass, Journ. N. Y. Ent. Soc, XI, 1908, pp. 183-188, pis. 

 XTi, xiii; XII, 1905, pp. 74-82, pl8. i, ii.— Kiri?y, Syn. Cat. Orth., II, 1906, 

 p. 192. 



Description. — Head slighth" broader than the anterior margin of 

 the pronotum into which it is well indented; vertex moderately prom- 

 inent; front broadly rounded, moderately full; eyes small, scarcely 

 prominent: antennae slender, the basal segment broad. Pronotum 

 moderatel}^ large and considera])l3^ extended posteriorly, the lateral 

 lobes well developed but not as deep as long, slanting very moderately, 

 and the posterior margin quite strongly sinuate; lateral carina^ mod- 

 erately prominent l;)ut dull, nearly straight, diverging from in front 

 backwards; pronotal disk scabrous, subtectiform, broader behind 



