258 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



and moderately oblique. Abdominal tergites apparently much as 

 described for thaumasia on page 225. ^^ Subgenital plate curled 

 upward and inward sinistro-proximad beside the base of the supra- 

 anal plate and there with a small rounded node, produced caudad 

 beside the lateral margin of the supra-anal plate, its apex armed 

 with two straight chaetiform spines directed caudad. Supra-anal 

 plate three-fifths as long as its proximal width, weakly chitinous in 

 distal portion, this area defined from the proximal area by a delicate 

 but distinct, straight, transverse sulcus, lateral margins feebly con- 

 cave, not convergent to bases of cerci, straight and strongly oblique 

 to within these, the remaining portion roundly produced, with median 

 emargination feebly suggested . Subgenital plate with sinistro-proxi- 

 mal portion speciahzed as described above, beyond this with surface 

 moderately convex so that the very broadly and irregularly convex 

 margin nearly touches the cercus, bearing on its internal surface at 

 the margin beneath the cercus a stout straight spine, directed dorso- 

 mesad, this section of the margin terminating at the small simple sin- 

 istral style, situated just within the sinistral cercus; this style cylin- 

 drical, about twice as long as broad, directed dorso-mesad; beyond 

 this point the margin is very deeply and roundly concave to the dex- 

 tral style, similar but smaller and more tapering, situated slightly sin- 

 istrad of the median point and directed dextro-caudad, the internal 

 surface of the plate at the base of this style bearing two stout spines 

 of equal length curved caudad; remaining large dextral section of 

 the plate curled inward beneath dextral cercus and supra-anal plate 

 to slightly beyond this point, the dorsal outhne of the projection 

 triangular, with apex bluntly rounded. Concealed genitalia com- 

 plex, the paired plate beneath the supra-anal plate apparently 

 developed into projections armed with minute teeth."-' 



General coloration of entire insect ochraceous-buff. Vertex to 

 between ocelli suffused with dresden brown. Eyes blackish brown. 

 Ocelli light buff. Disk of pronotum with a tawny orange tinge. 

 Tegmina showing an exceedingly faint and even tinge of buckthorn 

 brown. 



Length of body 9.4, length of pronotum 2.4, width of pronotum 

 3.2, length of tegmen 9.8, width of tegmen 2.9, length of caudal tibia 

 3.8, length of caudal metatarsus 1.6 mm. 



Though even less striking in general appearance than thaumasia, 

 this unique specimen also represents actually one of the most re- 

 markably specialized forms of the Blattidae known to us. 



Cariblatta mesembrina^" new specie?. Plate IX, flgiire 16. 



This species shows the greatest tegminal reduction known in the 

 genus. In C. lutea minima Hebard, from the United States, the 



^* The sinistral portion of the eighth tergite is damaged in this specimen. 

 '8 Dissection of this unique individual is inadvisable. 

 ««From [J.£aT;[JL^piva= Southern. 



