Vicinity of Mazon Creek, Illinois. 



369 



and sends forth in the right wing (left of the negative) 2 very 

 long forked branches, directed forward and outward. Cubitus 

 attains the end of the apical margin and sends 8 oblique 

 branches toward the posterior margin, few of them being ram- 

 ified. In the left wing (right of the negative) there is a long 

 forked branch, rising in front of the cubitus. Anal area two- 

 fifths of the wing length and filled by 7 regular veins. I see 

 nothing of cross veins. 



Holotype in Peabody Museum, Yale University, Cat. No. 60. 



Fig. 52. 



Fig. 52. Orthomylacris contorta. x 3. 



Family MYLACRID^E Scudder. 

 Orthomylacris contorta, new species. Fig. 52. 



An anterior wing of 23 mm . Slender and of a pointed cordi- 

 form shape, strongly vaulted. The costal and radial area on 

 the one hand, and the medial, cubital and anal areas on the 

 other, divide the wing into two nearly symmetrical halves. 

 The bundle of 4 or 5 subcostal branches extends beyond the 

 middle of the anterior margin. The radius sends forth very 

 obliquely 2 3-branched, a forked and a simple branch ; the 

 media 2 3-branched, a forked and a simple branch obliquely 

 backward. The cubitus occupies about the middle third of 

 the posterior margin and has a 3-branched and a forked 

 branch. Anal area at least twice as long as broad. Structure 

 leather-like. 



Holotype in Peabody Museum, Yale University, Cat. No. 61. 



Platymylackis, new genus. 



A very broad form, the pronotum of which is nearly twice 

 as broad as long. Anterior wing twice as long as broad, 

 obliquely cordiform. Costal area reaching nearly three- 

 quarters of the length. The subcosta and its branches not 



