90 NORTH AMERICAN BLATTIDAE 



Type. — cf ; Pulaski, Illinois. June 9, 1907. [Hebard Collec- 

 tion, Type No. 426.] 



Description of Type. — Size rather small, form slender. Interocular space narrow, 

 appreciably less than that between the ocelli and approximately two-fifths that 

 between the antennal sockets. Ocelli strongly defined ; inter-ocular-ocellar area dis- 

 tinctly flattened and showing a weak concavity, with surface bearing microscopic, 

 rather decided, irregular pits and transverse rugae. Pronotum with greatest width 

 slightly caudad of mesal point, oblique sulci of disk decided. Tegmina and wings 

 normal, fully developed. Median segment as described above. Other dorsal 

 segments unspecialized ; sixth with caudal margin transverse; seventh transversely 

 decidedly narrower, with caudal margin very feebly emarginate, nearly transverse; 

 eighth with caudal margin weakly oblique produced laterad, with mesal portion 

 nearly transverse. Supra-anal plate with lateral margins strongly convergent and 

 feebly concave to a point beyond cereal bases, thence weakly convergent and con- 

 vex to broadly rounded apex, surface weakly convex above styles, remaining proxi- 

 mal portion weakly concave, distal portion concave and strongly declivent, thus 

 forming at the juncture with the proximal portion a distinct, transverse, weakly 

 arcuate ridge. Cerci slender, not decidedly elongate, with lateral .margins rather 

 decidedly crenate meso-distad. Genital hook rather short and slender, subequal in 

 diameter throughout, with distal half rather sharply recurved. Subgenital plate 

 weakly convex, except distad toward bases of styles, where it is rather decidedly 

 concave, lateral margins moderately convex convergent in proximal half, thence 

 weakly concave convergent to styles, where the plate is very briefly and roundly 

 produced, between the styles the distal margin is weakly concave, feebly oblique, 

 as the plate at the dextral style is very slightly more produced; styles small, sim- 

 ple, cylindrical processes, situated in sockets on ventral surface of plate, on the 

 very brief rounded disto-lateral projections which are weakly ascendent, the dorsal 

 surface of the plate there showing no elevation, the dextral style slightly the longer, 

 equalling approximately half the distance between the bases of the styles. Ex- 

 posed folded ventral portion of eighth dorsal abdominal segment in length (normal 

 position) slightly greater than exposed portion of seventh ventral abdominal seg- 

 ment. 



From the additional males it is evident that the margins of the disto-dorsal 

 abdominal segments, supra-anal and subgenital plates show some variability in the 

 present species. The distal portion of the supra-anal plate is also variable in degree 

 of declivity. The wings have one to three incomplete and four complete rami of 

 the ulnar vein in the three males before us. 



Allotype. — 9 ; Havana, Illinois. August 14, 1907. [Hchard 

 Collection.] 



Description of Allotype. — Size decidedly larger and more robust than male. Head 

 much more evenly rounded, with ocellar spots clouded and subobsolete. Inter- 

 ocular space much broader than in male, distincth' less than width between antennal 



