256 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



lines broader and with all but a caudal patch of the intervening 

 area very dark, as well as in characters of the genitalia, particularly 

 the distinctive specialization of the sixth tergite. 



Type: cf ; Carcarana, Santa Fe, Argentina. [Hebard Collection, 

 Type no. 680.] 



Size small, form graceful, structure delicate as characteristic of 

 the genus. Interocular space about three-quarters as wide as that 

 between antennal sockets. Ocellar spots distinct, ocellar areas 

 rounding into interocellar area. Maxillary palpi moderately elong- 

 ate, third and fifth joints of equal length, fourth joint slightly 

 shorter. Lateral margins of face rather strongly convergent to 

 clypeal suture. Pronotum l)roadly rounded, symmetrically trap- 

 ezoidal, the greatest width near the caudal margin, that margin 

 transverse, very broadly convex; surface of pronotum Aveakly con- 

 vex. Tegmina and wings extending well beyond cereal apices. 

 Tegmina with numerous, decidedly oblique, discoidal sectors. 

 Wings with (7) heavily clubbed costal veins, with (6) complete 

 branches of the ulnar vein, intercalated triangle small but distinct. 

 Sixth tergite with a large projection meso-caudad, formed by two 

 rounded ridges which unite cephalad, thus forming a V-shaped prom- 

 inence, surface strongly concave cephalad . and laterad of this 

 prominence, supplied cephalad with numerous agglutinated hairs, 

 directed caudad and reaching as far as the blunt apex of the prom- 

 inence. Supra-anal plate broadly transverse. Paired plate be- 

 neath supra-anal plate large and unspecialized. Other concealed 

 genitaUc processes complex. Subgenital plate asymmetrical; sinis- 

 trad more produced than dextrad, with dextral portion curled up- 

 ward and inward; styles inset, the dextral decidedly the more so. 

 Sinistral style a flattened lobe, about twice as long as broad, ex- 

 panding slightly to the truncate apex, the angles of which are broadly 

 rounded. Dextral style somewhat similar but more elongate and 

 slender and curled strongly dextrad toward apex, the base of which 

 portion touches that of the sinistral style. Between the rather 

 irregularly formed styles the median portion of the plate is triangu- 

 larly produced, nearly filling the interspace between them. Limbs, 

 armament, pulvilU and arolia as characteristic of genus. ^^ 



Head with occiput ochraceous-buff tinged with tawny, deepening 

 ventrad, with inter-ocular-ocellar area auburn and remaining por- 

 tions of face blackish chestnut, ocellar spots light buff, antennae 

 snuff brown, the first joint darker proximad. Pronotum with two 

 broad longitudinal bars of deep chestnut brown, which broaden and 

 diverge slightly caudad throughout their length, intervening area 

 mars brown, except in a transverse, rectangulate area caudad which 

 is ochraceous-buff; latei-al portions of pronotum transparent, feebly 

 tinged with buff. Tegmina with marginal field and marginal por- 



"* Described, Mem. Am. Ent. Soc, No. 4, p. 35, (1920). 



