CARBONIFEROUS ARTHROPOD FAUNA 185 



1 1 . Mylacridae sp. 



Scudder, Bull. U. S. Geol. Surv., No. 124, p. 55, Plate II, Fig. 4. 



This is supposedly the humeral angle of the tegmen of a 

 gigantic cockroach. 



Figured specimen. Pal. Coll. No. 8948. 



The collection contains a large and rather well-preserved 

 specimen of Dipeltis diplodiscus Packard {^Am. Nat. 1885, p. 293) , 

 measuring nineteen millimeters in length. The remarkable 

 resemblance between this supposed Phyllopod crustacean and a 

 nymph or wingless female of the cockroaches can be seen from 

 the accompanying figures of the species. (Plate V, Fig. 6; 

 Plate VII, Fig. 6.)^ 



Family Protophasmidae Brongniart. 



12. Paolia Gurleyi Scudder (Plate VII, Fig. 7). 

 Proc. Am. Acad. Arts Sc, Vol. XX, p. 173. 



This interesting specimen, found in a whetstone from French 

 Lick, Orange county, Ind., is here figured for the first time. 

 Type. Pal. Coll. No. 6393. 



13. Dictyoneura clarinervis sp. nov. (Plate VI, Fig. i; Plate VII, Fig. 8). 

 Wing. Length 33""; greatest breadth, at middle, 10™™; 



rather pointed. Humeral angle explanate, filled with very oblique 



cross-veins from the mediastinal vein ; mediastinal oblique and 



vanishing at the end of the middle third of the wing. Scapular 



vein parallel with and not distant from the mediastinal, ending 



in the costa about one-seventeenth the distance from the tip at 



a slight indentation marking the termination of the marginal 



vein ; near its extreme base the scapular vein emits a lower 



branch unevenly divaricating from the main stem and furcating 



just before the last third, the lower branch trifurcating toward 



the tip and ending at the wing-apex. Externomedian vein not 



well indicated at the base, owing to the plication of the wing ; 



it furcates once near the point of branching of the lower scapular 



vein and possibly is split near the tip. Internomedian vein 



simple, sharply delineated. Anal vein extremely prominent, 



filling nearly the whole of the hind half of the wing, emitting 



'In a paper just issued E. H. Sellards assigns this species to Mylacris {Am. 

 Jour. Sc, April, 1903, p. 309). The shape of the pronotom agrees very well with 

 Promylacris rigida Scudd. 



