MORGAN HEBARD I 89 



the only uniformly dark colored species of the genus found in 

 North America, and it is widely distributed in the southern States 

 from central coastal Texas eastward. It is the only species of the 

 genus found in these regions which is not known from other por- 

 tions of the world. 



Close relationship is found to the Japanese P. picea Shiraki,'"'^ 

 the tw^o species agreeing in color, size^°- and even in numerous 

 features of the genitalia. In Juliginosa the shape of the male 

 supra-anal plate is different, the projection of its meso-ventral 

 specialization is divided, not rectangulate, while the apical portion 

 of the sinistral concealed genital process is shorter. 



Characters of Male. — (Jacksonville, Florida.) Size large, forni stout, about inter- 

 mediate between that of P. hniniiea and P. australasiae. Head much as in hrunnea 

 but proportionately not as large, with interocular space about one and one-quarter 

 millimeters in width. Pronotum much as in australasiae. Tegmina and wings 

 elongate and fully developed, about as broad as in hrunnea. Dorsal surface of 

 abdomen with median segment specialized as in brminea, but with sulcus distinctly 

 deeper and silky hairs of mesal tuft shorter, though not as short as in australasiae. 

 Supra-anal plate entirely chitinous, much as in australasiae, but with distal margin 

 weakl\- emarginate, and mesad at the apex of this emargination project from be- 

 neath 'minute, twin, rounded projections, their surfaces composed of microscopic 

 denticulations; these projections are seen from below to extend latero-cephalad on 

 the ventral surface of the plate as much larger callosities, with surfaces similarly 

 microscopically denticulate (pi. V'll, fig. 22). Cerci as in australasiae. Sinistral 

 specialized process within anal chamber of the same general type as found in aus- 

 tralasiae, but with apical portion much more slender, no wider than the preceding 

 curved portion, over five times as long as broad, with apex sharply rounded. Adja- 

 cent to this, dextrad, is a small, elongate, subconical, subchitinous process, covered 

 distad with scattered, minute, subchitinous, cylindrical projections. Above, 

 from a convolute, chitinous plate, spring two elongate, slender, adjacent, chitinous 

 claws, directed sinistrad at the bases, but curving evenly dorsad, then dextrad. 

 Ventro-mesad is another corneous production, bearing dorso-sinistrad a short pro- 

 cess, shaped like a half-section of tubing, from within the base of which [jrojects a 



2°' We are able to determine this from a large series of Japanese specimens of P. picea 

 before us. 



^^ Servilie's P. pallipalpis described in 1839, from Java, is apparently a smaller insect 

 than either fidiginosa or picea. Karny's wretchedly described P. japonica and emar- 

 ginala, from Japan, appearing in a superficial key in 1908, are, as far as can be determined 

 from such incomplete work, absolute synonyms of picea. Shiraki's description of picea 

 was received by Karny before publication, as a footnote indicates, but no effort was made 

 to correct the key. The probability of the above synonymy is further emphasized by 

 the fact that, in the considerable series of Japanese roaches before us, but one dark 

 species of Periplaneta, picea, occurs. 



MEM. .A.M. ENT. SOC, 2. 



