S. H. SCUDDE1I ON PALAEOZOIC COCKROACHES. 81 



of the mediastinal vein in Gerahl. Mahri, which reaches the apex where that of the scapular 

 vein impinges on the border in Etobl. elongata ; it is, therefore, plainly impossible that 

 they should be properly considered the same. 



A single specimen is mentioned by Geinitz from Weissig, Saxony. Lower Dyas. 



Etoblattina parvula. PL 2, fig. 9. 



Blattina parvula Gold., Neues Jahrb. f. Mineral., 1869, 161, taf. 3, fig. 6; — lb., Faun. 



saraep. foss., ii, 19. 



In form the front wing of this species agrees pretty well with that of the last, but it is 

 not so slender ; both costal and inner margins have a similar and pretty strong convexity, 

 and the -wing tapers rapidly and pretty regularly to a somewhat pointed tip, the very apex 

 of which is rounded. The veins spring from a common point, above the middle of the base 

 of the wing, and have scarcely any basal curve. The base of the mediastinal area is, there- 

 fore, about one-third as wide as the wing at that point, and the mediastinal vein, very grad- 

 ually approaching the costal margin, strikes it nearly at the end of the middle third of the 

 wing ; it emits half a dozen or more simple, oblique, slightly arcuate branches. The scap- 

 ular vein is nearly straight, curving only near the tip, and, running subparallel to the costal 

 margin, occupies with its branches a variable width of the wing, reaching the middle line 

 in the apical half; it commences to divide at some distance before the middle of the wing, 

 and emits about half a dozen simple, straight branches, the first one of which is forked 

 near the tip, and all have a direction similar to, but a little more longitudinal than, the 

 mediastinal branches; the vein terminates exactly at the apex of the wing. The externo- 

 median vein, emitting near the middle of the basal half of the wing a straight, apically 

 forked branch, which runs close and parallel to the scapular vein, itself bends downward, and 

 then turns out again, and continuing nearly parallel to its first branch, ends some distance 

 beyond the middle of the apical half of the inner border, emitting a couple of equidistant, 

 straight and simple branches on the way ; on the border, then, this area occupies the apical 

 fifth of the inner margin. The internoinedian vein runs in close proximity to the last vein, 

 and has, therefore, a rather deeply sinuous course, and emits three or four, basally curved, 

 apically forked branches. The anal furrow is very deeply impressed, strongly arcuate, ter- 

 minating near the end of the basal third of the inner border, and leaving the area 

 nearly as broad as long ; the anal veins of the upper half of the area are obscured ; in the 

 lower half they are thickly crowded, nearly straight, unusually longitudinal and deeply 

 forked. 



This is one of the very smallest species, the front wing measuring only 9 mm. in length, 

 and 3.75 mm. in breadth, the breadth being to the length as 1 : 2.4. In its minute size it 

 differs from all but the succeeding species, which agrees well, as Goldenberg remarks, with 

 that of the living Ectobia lapponica (Linn.) ; but it is peculiar, among palaeozoic cockroaches, 

 for the shape of the wing and the distribution of the branches of the lower veins of the 

 wing. It is most nearly related to Etobl. elongata, which is many times its size and is a 

 slenderer species. It agrees in size with Etobl. insignis, but the course of the internoine- 

 dian vein is very different, and all the veins and their branches are distinct instead of being 

 nearly obliterated, as in that remarkable species. 



A single specimen from Lobejun, Germany. Upper carboniferous. 



MEMOIRS BOST. SO<\ NAT. HIST. VOL. III. 



