1905.] 



NATURAL SCIENCES OF PHILADELPHIA. 



409 



Fig. 9.—Cibot- 

 opteryx rariegata. 

 Dorsal view of 

 pronotuni and 

 tegmina of type. 



Size medium ; surface of pronotum rugoso-tuberculate, of remainder 

 of body subglabrous. Head with the occiput evenly rounded both 

 longitudinally and transversely, dipping rather sharply down to the 

 base of the fastigium; fastigium extending a distance 

 cephalad of the eyes equal to the interspace, mod- 

 erately elevated, acute, margins rather low but dis- 

 tinctly and roundly raised above the slightly exca- 

 vated center, apex when viewed laterad rounding into 

 the frontal costa; lateral foveolse very slight and in- 

 distinct, trigonal; frontal costa narrow, rather 

 strongly sulcate, equal in width above the ocellus 

 except for the dorsal constriction, slighth^ inflated at 

 the ocellus, distinctly constricted then regularly but 

 slightly expanding below, reaching the clypeal mar- 

 gin; accessory facial carinre quite prominent; eyes 

 subovate, slightly shorter than the intraocular por- 

 tion of the gense, prominent when viewed dorsad; 

 antennre slightly exceeding the pronotum in length. 

 Pronotimi with the prozona moderately inflated, 

 deeply cut by the transverse sulci ; median crest rather 

 high and developed into three quadrate lobes on the prozona, lower and 

 evenly arched on the metazona; lateral carina? tuberculate, bent ven- 

 trad at an angle of 45° cephalad of the second transverse sulcus, and 

 joining the cephalic margin at the ventro-cephalic angle; margins 

 tuberculate, cephalic very broadly obtuse-angulate with the angle 

 truncate, caudal produced with concave sides and acute apex, caudal 

 margin of the lateral lobes distinctly oblique, ventral margin subro- 

 tundate with the ventro-cephalic margin moderately distinct. Teg- 

 mina with the costal margin rather strongly arcuate, the apex rectangu- 

 late, anal area very slightly arc\iate. Wings slightly shorter than the 

 tegmina and completely covered by the same. Abdomen with the 

 apex elevated; subgenital plate covered by the large lamellate cerci 

 which meet on the median line ; supraanal plate with the apex rectangu- 

 late. Cephalic and median femora slender proximad, moderately but 

 distinctly inflated mesad and distad. Caudal femora slender, very 

 slightly bowed, with the proximal inflation very slight, the genicular 

 margin with a slight median spine; tibise about equal to the femora in 

 length, spines nine in nimiber on each margin, those of the internal 

 margin much longer and more curved than those of the external mar- 

 gin, internal spurs much longer than the external; tarsi of moderate 

 length, the metatarsus and third joint subequal in length. 



