OXYHALOA. 77 



55. Elytra subcornea, abdomen haud superantia, sulco anali obsoleto vel nullo, 

 tota polita, haud in longitudinem punctata ; venis per transluciditatem 

 distinetis, subtilibus, distribution e illis generis Chorisoneurm siaoailibus. 

 Pronotum $ semiorbiculare. Cerci longiusculi. — [Hemipterota, Sss.] 

 44. Elytra cornea, tota in longitudinem multi-venosa, seriebus longitudinalibus punc- 

 tatis inter venas obsita ; sulco anali nullo, venulis costalibus pectinatis nullis ; 

 area costali basi angusta fere et ad apicem elytri angustissime perducta et per 

 sulcum discreta. Cerci mediocres. — [Areolaria, Br.] 

 33. Corpus convexum, ellipticum; elytris parum elongatis, corneis, sulco anali nullo. 

 Alse campo appendicular! parabolico, elongato, basi transverso instructs ; campo 

 marginali apice dilatato, venis costalibus parum numerosis. — Plectoptera, Sss. 

 22. Caput, pronotum et elytra pilosa, lanosa. Antennae incrassatse, plumosas. Pronotum 

 quadratum. Caput valde prominulum, triangulares oculis maxime remotis. Elytra 

 valde angusta, subcornea, abdomen superantia. AIec apice campo appendicular! variabili 

 instructs. Abdomen apice attenuatum. Pedes graciles, tibiis graciliter spinosis. — 

 Hypnorna, St. 



OXYHALOA, Brunn. de W. 

 Oxyhaloa, Brunner de W. Syst. Blatt. p. 252; Saussure, Miss. Scient. Mex., Ortbopt. p. 89. 



This rather aberrant genus lacks the most important characters of the Tribe 

 Plectopterinse — to wit, the wings do not possess an intercalated or appendicular field, 

 which, in rest, is turned back on the upperside. But this exception is more apparent 

 than real; in Oocyhaloa the intercalated triangular field is virtually present, but it 

 is confounded with the posterior field ; and this is why the axillar nervure is arched, 

 enveloping the posterior margin of the anterior field *. The species of the Old World 

 are still more aberrant, as in these the posterior field does not envelop the hind margin 

 of the anterior one, and the axillar vein is straight. 



1. Oxyhaloa buprestoides, Sauss. 



Blatta buprestoides, Sauss. Rev. et Mag. de Zool. 1862, p. 166; Mem. Mex., Blatt. p. 116. 55, 



fig. 20 (S). 

 Ischnoptera buprestoides, Brunn. de W. Syst. Blatt. p. 140. 20. 

 Oxyhaloa buprestoides, Sauss. Miss. Scient. Mex., Orthopt. p. 90, t. 2. fig. 48. 



Fuscescens, fusco-punctata. Caput flavescens, facie et vitta verticis fuscis, vittaque interantennali flava. 

 Pronotum ellipticum, margine posteriore leviter subarcuato, haud angulato, disco brunneo, marginibus 

 lateralibus testaceis, valde fusco-punctatis ; sulcis disci campum trapezinum delineantibus ; margine poste- 

 riore transverse striolato. Elytra abdomen superantia, fusco-punctafca, margine costali baud sinuato, in 

 medio recto. Alse vitreae, venis brunneis, campo marginali griseo ; venae ulnaris ramulis 7-10 pectinata. 

 Pedes testacei, fusco-punctati. Abdomen fuscum, marginibus et ventre medio fulvis, nigro-punctatis. 



$. Long. 18-5; elytr. 17, pronot. 4-25, latit. pronot. 6 millim. — S- 14-6; elytr. 11*75, pronot. 3-5, latit. 

 pronot. 4*6 millim. 



Hab. Mexico ; Guatemala. — Cuba (Mm. Genavense). 



* Comp. H. de Saussure, Annales des Sciences Naturelles, x. pp. 161-200, t. 11 (1868); and Miss. Scient. 

 Mex., Orthopt. pp. 89, 90, t. 2. fig. 48. 



