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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXIX. 



file of the wing. The media enters into union with the radial sector 

 by means of its superior branches; likewise the cubitus with the media. 

 The anal veins arise from one conunon stem, which stretches obliquely 



to the inner edge, 



Fig. 18.— Adiaphtharsia feerea. 



SO that we appar- 

 ently see but one 

 anal vein with 3 off- 

 shoots branching 

 off posteriorly. 

 Cross veins are de- 

 veloped in small 

 numbers. 



Unfortunately, 

 there is but one 

 specimen of this in- 

 teresting form at 

 hand, Avhich is from 

 the collection o f 

 Mr. Daniels. The wings are all preserved onlj^ to the middle, and 

 their venation is, on account of occasional shifting, hard to decipher. 



Order HADENTOMOIDEA, new order. 



I establish this order upon a very interesting insect, which in many 

 points still recalls the PalsBodictyoptera; in other respects, however, 

 it departs so widely from this and all other fossil groups that I regard 

 the new order warranted. 



The head is free, rather large, and apparently prognathous; it shows 

 moderately large, lateral, compound eyes, and its form somewhat 

 recalls the head of perlids or embids. The prothorax is remarkably 

 elongate and wider than the head, without pleurites. Meso- and 

 metathorax somewhat smaller than the prothorax. A))domen rather 

 compressed, shorter than the wings. Hind wing only slightly shorter 

 and broader than the front wing, while the difference in their venation 

 is scarcel}^ worth mentioning. Costa marginal, well developed; sub- 

 costa abridged, ending inmiediatel}'^ below the middle of the wing. 

 Radius simple and stout, continuing to the tip. The radial sector 

 arises near the base and is far removed from the radius; it separates 

 into 3 branches. The media is free and forms a large fork. The like- 

 wise free cubitus extends obliquely to the inner border and sends out 

 posteriorly 4 short, simple, or furcate branchlets. The first anal vein 

 forms a short fork, the second is simple, and both continue in a curve 

 to the posterior margin. The anal area is small in both pairs of wings 

 and is not defined. The wide space between the radius and the radial 

 sector is filled up with large polygonal cells and the remaining inter- 



f! 



