168 PR.OCEEDINGS OP THE AMERICAN ACADEMY 



2. Wings very large, scapular veia begiuning to branch in the middle 

 of the basal half of the wing Titanophasma. 



2. Wings generally much smaller than in the preceding genus, scapu- 



lar vein first branching at, or beyond, or only a little before, the 

 middle of the wing. (In some small species of Dictyoneura s. s. 

 it branches unusually near the base.) 3 



3. Scapular and externomedian veins first dividing near together before 



the middle of the wing ; branches of the scapular vein arising 

 from a single principal branch 4 



3. Scapular vein first dividing beyond the middle of the wing, and usu- 



ally far from the first forking of the externomedian vein ; branches 

 of the scapular vein arising from the main stem . . Litoneura. 



4. Internomedian vein simple Dictyoneura. 



4. Internomedian vein forked Polioptenus. 



ii. Wings triangular, much broader next the base than beyond ; the 



tip roundly pointed Breycria. 



o. Winffs oblonir-ovate, broadest in the middle, or as broad in the mid- 

 die as next the base ; the tip generally rounded, but sometimes 

 pointed 6 



6. Fore wings four, or less than four, times as long as broad ; branches 

 of veins oblique, curving down to and striking obliquely the lower 

 margin of the wing, of which margin those of the externomedian 

 vein occupy at least one third ; anal area extending nearly to the 

 middle of the wing ; no intercalary veins . . . Goldenheryia. 



6. Fore wings five or six times longer than broad ; branches, either 

 much curved, running at first longitudinally, and then becom- 

 ing very oblique, striking the margin Jiearly at right angles, 

 and with many intercalary veins ; or more nearly resembling 

 Goldenbergia, and without iutercalaries ; in both cases with 

 rare dichotomosis Jldplophlehium. 



6. Fore wings four, or less than four, times as long as broad ; branches 

 of veins dichotomizing strongly, and running longitudinally, so 

 that those of the externomedian vein occujiy only a slight portion 

 of the lower margin ; no intercalary veins PaoUa. 



TiTANoniASMA Brongniart. 



This is the larger type of the two whose bodies were found by 

 Brongniart, one measuring as much as a fourth of a metre in length. 

 Tlie r('seml)l;ince in every essential feature of the neuration of the 

 Aving of Hroiigiiiari's type to the lai'gcst-sizeil wings heretofore re- 



