MORGAN HEBARD 49 



In addition to the type and allotype the following paratypes are 

 before us. 



Tabernilla, Canal Zone, Panama, V, 13 to VI, 16, 1907, (Busck), Tfd". 

 Empire, C. Z., Pan., XI, 14, 1913, (Hebard; found dead on ground), I (f. 

 Corozal, C. Z., Pan., I\', 26, 191 1, (Busck), i cf. 



RHYTIDOMETOPUM" new genus 



The single known species of this genus suggests in size, form and 

 delicacy of structure an obscurely colored insect superficially 

 similar to Euthlastoblatta abortiva (Caudell). 



In the characters of major importance nearest agreement with 

 Supella Shelford is found. The present genus has, however, the 

 sexes similar; the interocular space wrinkled, not smooth; the 

 inter-ocular-ocellar area unspecialized, not raised and tlattened; 

 the tegminal discoidal sectors moderately, not strongly, oblique, 

 and the wings with the intercalated triangle much more decided 

 and radiate field more ample. 



In linear arrangement we place the present genus after Chromat- 

 onotiis, here described, and before Supella Shelford. The relation- 

 ship to both these genera is not at all close. The genus represents 

 one of the complex units, sharing features with manydiverse genera, 

 so often found in the Blattidae. Such are manifestly indicative 

 of the great antiquity of this family. 



The genus is monotypic. Gpzxotype: Rhytidometopum megal- 

 optemm new species. 



Generic Description. — Size and form medium, structure rather 

 delicate for the Group Blattellites. Interocular space narrow, 

 showing a distinctive transverse wrinkling. Inter-ocular-ocellar 

 area not specialized; face not strongly convex, with lateral mar- 

 gins strongly convergent to clypeal suture. Fifth (distal) joint of 

 maxillary palpi large, longer than preceding joint. Pronotal 

 surface convex, slightly more so than in the usual type in Neo- 

 blattella Shelford. Tegmina and wings fully developed in both 

 sexes. Tegminal discoidal sectors moderately oblicjue. Wings 

 with costal \'eins heavily clubbed distad ; intercalated triangle 

 broad and conspicuous; radiate field unusually broad for the 

 Group. Dorsal surface of male abdomen with sixth segment 



®^ From pvtLs and /itTuwoi', wrinkled forehead. 

 MEM. AM. ENT. SOC, 4. 



