CLASSIFICATION OF PALEOZOIC INSECTS. 337 



arcuate. The wing is the only part preserved and is very imperfect, showing only the 

 middle of the wing. The length of the fragment is 11 mm.; probably the whole length 

 of the wing was 20 mm., the breadth 6 mm. 



From the intercomglomerate beds of Pittston, Penn. Mr. R. D. Lacoe, No. 2042. 



Strephocladus (o-rifa, K\a8os) gen. now 



• 



The wing is long, slender an 1 nearly equal throughout. The mediastinal vein throws off 

 distant and longitudinally oblique, more or less arcuite or sinuou-; branches to the margin 

 in the basal half of the wing ; in the apical half, in common with the mediastinal, frequent, 

 straight and tranversely oblique branches. The scapular branch arises shortly before the 

 middle of the wing and sends several simple longitudinal branches to the upper half of the 

 apex ; it is connected close to the base to the otherwise simple externomedian vein. The 

 internomedian vein is the most remarkable and characteristic; instead of following the 

 course of the externomedian vein and emitting inferior offshoots, it runs to the middle of 

 the lowei border of the wing and emit; from its superior surface a number of nearly 

 straight simple or forked offshoots parallel to the externomedian vein, to which the upper- 

 most is united by a few basal cross veins. The anal veins are numerous and arcuate. 



Strephocladus subtilis. 



Petroblattina subtilis Kliver, Palaeontogr., xxix, 254, pi. 35, fig. 1. 

 The peculiarity of the internomedian vein wrongly led Kliver to consider this a cock- 

 roach, since Petroblattina presents a similar feature. 

 Carboniferous deposits of Schiffweiler, Germany. 



Aethophlebia (aiiB^s, $\i*\i) gen. nov. 



A very remarkable and anomalous genus, particularly in the structure of the interno- 

 median vein, and in the existence of an adventitious vein made up largely of a branch of 

 the -internomedian. and running across the externomedian vein into the main branch of 

 the scapular vein in such a way as to appear a baseward continuation of it. The medias- 

 tinal vein strikes the scapular a little bejond, and the main scapular branch is thrown off 

 a little before, the middle of the wing ; the latter is at first parallel to the costal margin 

 until, just below the tip of the mediastinal, it meets the adventitious vein, when it takes 

 the upward course of the latter until it is in near proximity to the main vein ; it emits 

 three or four longitudinal, slightly cleclivent, parallel branches. The externomedian vein 

 is coalesced with the internomedian at the base, then takes a straight, horizontal course to 

 the adventitious vein, where it forks into two simple branches parallel to the scapular off- 

 shoots, the base of the fork forming part of the adventitious vein. The internomedian vein 

 runs in a slightly tortuous course toward the middle of the lower margin of the wing and 

 be3 - ond its middle sends out obliquely upward the main branch which forms the adventi- 

 tious vein, and from the lower surface of the branch and the outer surface of the main 

 stem arise frequent straight and mostly simple branches like the scapular offshoots. 



