178 INSECUTOR INSClTliE MENSTRUUS 



middle tibiae whitish at base and with a whitish ring at basal third, the 

 first tarsal joint white on the basal two-thirds ; hind tibiae broadly whitish 

 at base, a whitish ring before the middle, the first tarsal joint white on 

 the basal two-thirds, the second with a white ring at base. Claws with 

 a minute acute tooth close to base. Wings hyaline, a predominatingly 

 reddish iridescent spot in the anal field ; venation normal, the thick veins 

 yellowish brown, spines and setulae black. Halteres with dark stem aind 

 white knob. 



Length: Body about 1.8 mm., wing 2.8 mm. 



Punta Gorda, British Honduras (J. D. Norton). 



Type, Cat. No. 191 I 1, U. S. Nat. Mus. 



Described from a series of 35 specimens in poor preservation. Hie 

 species is remarkable for the peculiar double annulation at the bases of 

 the tibiae and the almost uniformly gray mesonotum rather densely clothed 

 with evenly distributed hair-like scales. 



Simulium rubicundulum, new species. 



Female : Occiput blackish gray pruinose ; frons moderately broad, 

 narrowed very slightly toward antennae, pale gray pruinose, with scattered 

 fine black hairs. Antennae stout, blunt at tip, the first two joints yellow, 

 the others brownish gray, all strongly whitish pruinose. Scutum tinted 

 duU reddish beneath a dense pale gray pruinosity, a narrow black median 

 line becoming obsolete on anterior half, a pair of sinuate bare black stripes 

 of uniform v\adth throughout and forming the usual lyre-pattern, extending 

 from anterior margin to the broad black shade in front of the scutellum, 

 the black shade extending forward along lateral margins nearly to humeri ; 

 vestiture of small, very slender, white hair-scales not disposed in groups 

 or rows. Scutellum narrow, roundedly triangular, reddish, clothed with 

 transverse, long and slender white hair-scales. Postnotum rather narrow 

 and elongate, blackish, strongly white pruinose. Pleurae blackish gray 

 pruinose, the propleurae and anterior coxae pale ocherous yellow. Abdo- 

 men subcylindrical, dorsally dull black, the margins of the segments gray ; 

 venter pale gray. Legs ochraceous, marked with black and white. 

 Fore legs with the femur yellow, the tibia with a narrow subbasal black 

 ring and the apiccd third black ; tarsi wholly black. Middle legs with 

 the femur yellow, blackish at apex ; tibia with a blackish subbasal ring 

 and the apical portion broadly blackened ; tarsus with the first joint white, 

 its apical third black, the second joint black with broad white basal ring, 



