44 THE BLATTIDAE OF PANAMA 



transparent, suffused with brussels brown; suffusion sudan brown in area of ulnar 

 and discoidal veins, becoming still darker, amber brown, toward the costal margin. 

 Dorsal surface proximad cinnamon brown shading to blackish chestnut brown 

 distad, cerci of that color. Underparts and limbs pale ochraceous-tawny, the 

 abdomen becoming cinnamon brown distad. 



Measurements (in millimeters) 



Length of Length of Width of Length of 



Cy body pronotum pronotum tegmen 



Type 15.8 4.7 6.2 20.2 



Paratype 16.8 4.6 6 18.9 



In addition to tlie type, a single male paratype, taken at the 

 same locality, February 28, 191 1, by Busck, is before us. 

 CHROMATONOTUS59 new genus 



In linear arrangement we place this genus after P/a/y e^/^^Hebard, 

 and before Rhytidometopiim here described. In general form 

 and structure close resemblance is shown to some of the small 

 species of the genus Ischnoptera Burmeister, of the Group Ischnop- 

 terites. 



Though in size and form exceedingly different from Platylestes,^^ 

 these genera agree in having "type B" armament of the ventro-ce- 

 phalic margins of the cephalic femora with three heavy distal spines, 

 the tegminal discoidal sectors longitudinal, male dorsal abdominal 

 segments unspecialized and four proximal tarsal joints supplied 

 with pulvilli. Signal difference from Platylestes is found in the dis- 

 tinctive coloration, much less transverse pronotum, very much 

 narrower tegmina and anterior field of the wings, the well devel- 

 oped intercalated triangle of the wings, more elongate and slender 

 cerci and caudal metatarsi much longer, not distinctly shorter, 

 than the combined length of the succeeding joints. 



Though in general appearance much closer to Rhytidometopum, 

 very great structural difference is found, these genera in primary 

 features agreeing only in the wings having a well developed inter- 

 calated triangle, the tarsal joints having similar pulvilli and the 

 tarsal claws being unarmed. 



"From xpi^Ma and vihros. Colored back; in allusion to the fact that in the four 

 species of this genus at hand, all have the pronotum conspicuously and distinctively 

 marked. 



" See Ilebard, Trans. Am. Ent. Soc, xlv, p. 97, pi. xvii, fig. i, (1919)- 



