86 



SMITIISOXT W illSCELLAXEOUS COLLECTIONS 



VOL. 52 



venation and regular cross-veins ; medius free and with three main 

 branches ; radius once forked distad of the middle. Cross-veins 

 irregular in areas proximad of intercalary veins and in costal area, 



Fig. 25. — Lygobins knoivlfoni 



otherwise fairly regular and closer spaced. Apex of wing bluntly 

 rounded. Costal margin nearly straight, and, in distal half of wing, 

 almost parallel to the posterior margin. 



LYGOBIUS KNOWLTONI, new species 



Locality. — Meriditt mine, 6 miles southwest of Geyser, Cascade 

 County, Montana. Kootanie formation (Lower Cretaceous). 



Length of Wing. — 6.5 mm. 



Greatest Width. — 3.3 mm. 



Subcosta reaching decidedly beyond middle of wing, rather sin- 

 uous, originating caudad of middle of base of wing. The two simple 

 branches of the radius extend to the costal margin, near to the begin- 

 ning of the apical border. Medius forking somewhat proximad of 

 middle of wing, lower branch forking again at about the middle of 

 wing, all three branches forking again at about distal fourth of wing. 

 Cubitus ending in a fork beyond distal fourth of wing; proximad of 

 this are a fork, a simple branch, and five forked branches. At least 

 three slightly sinuous anal veins. Anal area defective.^ 



Type, U. S. N. M., Cat. No. 50,461. 



^ The drawing was made by the author with camera lucida. No restoration 

 was attempted, save in the case of the cubital cross-veins, which are somewhat 

 obliterated and difficult to see. 



