128 S. II. SCUDDERON PALAEOZOIC COCKROACHES. 



forming quadrate cells with the longitudinal veins, and apparently more distant in the anal 

 area than elsewhere. The veins are everywhere edged with black. Length of fragment, 

 27.5 nnn. ; breadth, 1 nun. 



Heer suggests that this may be the under wing of Gerabl. clathraia, hut the unusual 

 width of the mediastinal area in the front wing of that species does not harmonize well 

 with the narrowness of the same area in this hind wing; and it is hardly probable that we 

 shall ever he aide to determine where it does belong. 



A single specimen, from the coal-measures of Manebach, near Ilmenau, Thiiringen. 

 Upper carboniferous. 



Blattina venosa. PI. 4, fig. G. 

 Blatt'ina venosa Gold., Faun, saraep. foss., ii, 19, 25, 51, pi. 1, fig. 7. 



This species is based upon a single fragment from the middle of a wing, whether front or 

 hind can scarcely be determined. Goldenberg says it is of a front wing, but there appears 

 to be no reason for his conclusion. There are a pair of branching veins, the main stems 

 running parallel to each other, and the branches divaricating on opposite sides. Goldenberg 

 says the veins are remarkable for their distinctness, and therefore as he makes no mention 

 of any reticulation or cross venation, there probably is none ; the openness of the neura- 

 tion, with the undeviating course of the branches throughout the rather large fragment, 

 indicate a large species. The two principal veins represented would appear to lie the scap- 

 ular and externomedian ; or, perhaps, the externomedian and internomedian. Length of 

 fragment, IS mm. ; breadth, 12 mm. 



The single specimen was found in a soft, yellowish shale near Wemmetsweiler, in the 

 neighborhood of Saarbriicken, Germany. Upper carboniferous. 



On PI. 6, figs. 11 and 13, are represented two fragments of wings probably belonging to 

 cockroaches, but of which little more can be said. Fig. 11 comes from Cossett's pit No. 1, 

 at Sydney, Cape Breton, and was found by Col. A. J. Hill; it has no natural border 

 whatever, and may belong to almost any part of the wing; it may perhaps be a portion of 

 an externomedian area, similar to that of Petrdbl. sepulta (with which it was found), and 

 in that case would probably represent a distinct species. Lower carboniferous. 



Fig. 13 probably represents the central portion of a wing, the right hand set of branches 

 belonging to the scapular, the left hand set, which are wrongly represented as connected at 

 base with those of the right hand, then belonging to the externomedian vein. The speci- 

 men (No. 2010) came from immediately below vein C at Cannelton, Beaver Co., Penn., 

 and was discovered by Mr. I. F. Mansfield, through whom 1 received it. It represents a 

 species of perhaps the same size as Archim. parallelum, ami possibly belongs to it; but as 

 no part of the margin is preserved, any attempt to place it is useless. Lower coal measures 

 of Pennsylvania. 



Polyzosterites. 



Polyzosterites Gold., Vorw. Faun. Saarb., 18; — lb.. Faun, saraep. foss., i, 18. 



Goldenberg defines the genus as consisting of cockroaches in which both sexes are apter- 

 ous, with nearly semicircular, very slightly marginate pronotum, and a flat, crustacean-like 

 abdomen with sharply edged margin. 



