434 KANSAS UNIVERSITY SCIENCE BULLETIN, 



Simulium notatum, n. sp. 



Female : Yellow, with short yellow pile. Head yellow, cov- 

 ered with a thin grayish coat, mouth-parts and antennae yellow, 

 latter brownish on apical half, eyes black. Thorax, including 

 scutellum and halteres, uniformly yellow. Abdomen yellow, 

 dorsum with a row of four opaque, black spots ; one specimen 

 has the anterior part of the abdomen brownish, but this I be- 

 lieve to be due to desiccation. Legs yellow, last tarsal joint 

 black, metatarsi with a row of short black spines on posterior 

 margin, remaining joints with a few black, bristle-like hairs, 

 tarsal claws simple. Wings hyaline, larger veins yellowish 

 translucent. Length, 1.75 mm. 



Two specimens ; Bill Williams Fork, Arizona. Collected by 

 Dr. F. H. Snow. 



Mydas abdominalis.D.sp. 



Male and female : Opaque black, abdomen except the first 

 and last segments reddish yellow. Pile of face and front black, 

 in some specimens intermixed with white ones, orbits of face 

 and front grayish pollinose ; antennae slender, lamelhie truncate, 

 sometimes with a dull reddish cast on inner side. Thorax 

 opaque black, pile black, pleurae with a very thin coat of gray 

 pollen, halteres black. First abdominal segment, except nar- 

 row posterior border, opaque black, with black pile, the last 

 segment in the female, and the hypopygium in the male, black, 

 with black pile, in some specimens mixed with white, remainder 

 of abdomen reddish yellow, both dorsally and ventrally, and 

 with short yellowish pile. Legs black, hind femora with the 

 usual spines beneath, the hind tibiae with a strong apical spur, 

 tip of latter and base of claws reddish. Wings uniformly dark 

 brown, venation normal, posterior marginal cross-vein present. 

 Length, 25-28 mm. 



Congress Junction, Ariz. Collected by Dr. F. H. Snow. 



