192 NORTH AMERICAN BLATTIDAE 



Subfamily PANCHLORINAE 



The species of the Panchlorinae are all almost or entirely con- 

 fined to tropical regions, two being found within the limits of the 

 United States. 



The following features are considered diagnostic. Pronotum 

 strongly produced caudad or with distinctive contour, rarely of 

 usual Blattid type. Tegmina and wings fully developed in the 

 majority of the species. Wings with numerous incomplete rami 

 of the ulnar vein, intercalated triangle subobsolete or absent. 

 Femora with ventral margins unarmed, except sometimes with a 

 single distal spine; ventro-cephalic margins of cephalic femora 

 smooth to heavily fringed with hairs. Tarsal joints very slender 

 and elongate, supplied with moderate to very large pulvilli. 

 Distinct arolia present. 



PYCNOSCELUS Scudder 



Blatta, Panchlora and Leiicophaea^°^ of authors. 



1862. Pycnoscelus Scudder, Bost. Jour. Nat. Hist., vii, p. 421. 



In addition to the widely spread genotype, several Asiatic 

 species of the genus are known. 



Genotype, by monotypy: Pycnoscelus ohscurus Scudder = 

 Pycnoscelus surinamensis {[Blatta] surinamensis) (Linnaeus). 



Geyieric Characters. — Pronotum rather strongly convex, laterad 

 declivent; caudal margin strongly and broadly angulate produced, 

 with apex bluntly rounded and sides feebly concave. Tegmina 

 and wings fully developed in both sexes; reaching, to extending 

 considerably beyond, the apex of the abdomen. Tegmina broad, 

 broadest mesad ; discoidal sectors (formed by the numerous branches 

 of the humeral, anal and ulnar veins) weakly oblique, with minute, 

 inconspicuous, transverse veinlets. Wings broad ; area of irregular 

 costal veins narrow, bounded by mediastine vein to near apex of 

 wing; ulnar vein with numerous, rather strongly oblique, incom- 



3"9 Kirby in 1904 (Syn. Cat. Orth., i, p. 151), has attempted to sinii Pycnoscelus in 

 the synonymy under Leucophaea, and select as type of that genus, Blatta surinamensis 

 Linnaeus. This action was due to the fact that he objected to genera and species based 

 upon immature material. His action is doubly invalid, as the genotype of Lettcophaea 

 had already been properly selected as Blatta maderae Fabricius, by Rehn in 1903 (Trans. 

 Am. Ent. Soc, xxix, p. 282), and the valid genus Pycnoscelus antedates the valid genus 

 Leucophaea by three years. It may be further noted that Rhyparohia, described in 1.S92, 

 falls as an absolute synonym of Leucophaea, described in 1865. 



