88 FAMILY II. BLATTID.E. THE COCKROACHES. 



Texas. The female was first described by Scudder (1862, 419) as 

 EctoMa flavocincta. This name was first correlated as the female 

 of pennsylvanica in my Orthoptera of Indiana (1903, 179). The 

 males have been described under five additional specific names, 

 viz., boreal is, couloniana and nortoniana Saussure (1862a, 166, 

 169) ; translucida Saussnre (1864, 85), and inceqnalis S. & Z. (1893, 

 36), and the female under one, niarginata Scudder (1872, 251). 

 The /. inwqualis S. & Z. of my former work (1903, 182) and of 

 Eehn & Hebard (1910, 427) are shown by Hebard (1917a, 140) to 

 represent only a color phase of P. pennsylvanica. 



25a. PARCOBLATTA PENNSYLVANIA DIVISA (Sauss. & Zehnt.), 1893, 40. 



Male Differs from pennsylvanica in its usually smaller size and often 

 slightly paler coloration, the dark disc of pronotum frequently divided by 

 a paler line, and that of tegmina sometimes pale brownish-yellow instead 

 of reddish-brown; also in having the median dorsal segment of abdomen 

 alone modified, and the supra-anal plate subtriangular, its median por- 

 tion narrower, more strongly concave and declivent. Females differ only in 

 their smaller size and proportionally narrower pronotum, with its lateral 

 margins less strikingly pale. Length of body, $ , 13.8 17.6, $ , 12.7 

 16.5; of pronotum, $, 3.64.6, 9, 3.74.9; of tegmina, $, 16.420.8, 5, 

 7.210.8 mm. Width of pronotum, ^ , 4.86.2, 9, 4.76.6; of tegmina, 

 5, 5-16.6, $, 44.9 mm. (Fig. 43, B.) 



Ranges from New Jersey and Pennsylvania, south and west to 

 Thoniasville, Ga., and Lafayette, La. Occurs under the bark of 

 pine and sweet gum and beneath signs on trees; the females and 

 young trapped in molasses jars. No definite fixed character of 

 specific value separating this form from pennsylvanica has been 

 pointed out by Rehu & Hebard in either their 1910 or 1916 papers, 

 and the only one given by Hebard (1917a) is the lack of speciali- 

 zation in the basal abdominal segment of dirisfi. R. & H. (1916, 

 115), state that "divisa is clearly a derivative of the pennsylvanica 

 stock representing an adaptation of that type in the lower coun- 

 try of the southeastern States as I. p. incequalis is in the central 

 States," the difference being that intergraded specimens have 

 been found between incequalis and pennsylvanica but not between 

 the latter and divisa. Hebard (1917a, 134) states that "due to 

 the decided individual variation found in divisa and the very 

 great plasticity in pennsylvanica, rare females are most difficult 

 to distinguish, as in them great convergence in many features us- 

 ually of distinct value occurs." The measurements as given under 

 the two forms show that in every case the maximum in divisa is 

 greater than the minimum in pennsylvanica, and in several in- 



