46 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



cutting edge sinuate, but not distinctly bidentate ; venation nearly as Kohl figures 

 for Tracheliodes megerlei (Brachymerus megerlei Dahlb.), but having the stigma 

 longer and narrower ; the cells are practically the same ; the costal cell is almost 

 obsolete. Measurements in ft: length of marginal cell, 705; its breadth, 225; its 

 breadth at the truncate end, 135 ; length of stigma, 420 ; its breadth, 105 ; length 

 of s. m., 750 ; length of first discoidal cell, also 750 ; length of second discoidal, 

 540; r. n. joining s. m. at middle ; t. m. a short distance basad of b. n. 



Type. — No. 2015, Mus. Comp. Zool. Florissant, Col. (No. 3200, S. H. 

 Scudder Coll.). I use the name proposed by Morawitz (1866) for this genus, 

 because Brachymerus Dahlbom, 1845, though earlier, is a homonym. The 

 genus has not hitherto been recognized in America, and it may be that if all 

 the parts (e. g. of the mouth, etc.) of the extinct form could be examined, it 

 would be found generically separable. At present, however, I can find no 

 grounds for separation. 



PEMPHREDONIDAE. 



Passaloecus scudderi, sp. nov. 



Length 6^ mm. ; black, with a large, broad (width about 2£ mm.) head, globose 

 thorax, and narrow sessile abdomen ; breadth of thorax 2£, of abdomen about 1£ 

 mm., hind margins of abdominal segments broadly rather pale brown; ocelli 

 normal; anterior wing about 3£ mm. long, venation rather pale brown; stigma 

 rather large, about 135 ^ broad ; marginal cell normal ; first s. m. about 780 fi 

 long; second s. m. 255 long and about 375 high, its sides parallel; b. n. strongly 

 curved ; first r. n. entering first s. m. about 135 fx from its end ; second r. n. joining 

 second s. m. very slightly beyond the middle ; apical corner of first discoidal 

 rather more elongated and pointed than usual; b. n. falling a little short of t. m. ; 

 second discoidal oblique, slanting downwards apicad. 



Type. — No. 2016, Mus. Comp. Zool. Florissant, Col. (No. 8758, S. H. 

 Scudder Coll.). Closely allied to existing United States species. 



PHILANTHIDAE. 



Prophilanthus, gen. nov. 



Large and robust, with a sessile abdomen ; stigma little developed ; marginal 

 cell narrowly but very obtusely rounded at apex, the apical point away from costa, 

 and quite without an appendix ; third submarginal cell very broad, and equally 

 broad above and below; basal nervure joining subcostal a long way basad of 

 stigma. Compared with Philanthus albifrons Cresson, the fossil insect showed the 

 following differences : — 



(1) Portion of stigma in marginal cell shorter. 



(2) Marginal cell bulging basally, i. e., in the direction of the first t. c. 



(3) Marginal cell with apex rounded, the apical point not on costa. 



(4) Third t. c. arched, with more or less of a double curve (a character of 

 Philoponus). 



(5) Second s. m. broader, and receiving first r. n. more distinctly before middle. 



