SIMULIUM. 39 



ened, pilosity yellow, on fore tibiae dorsal surfaces silvery, dorsal 

 surfaces of all joints with longer, upright, i)ak' hairs, fore tarsi not 

 distinctly thickened, hind tarsi with basal joint slightly thinner 

 than tibiae and produced at apex posteriorly, second joint with basal 

 scale and excision; claws trifid. Wings as in female. Ilalteres 

 brown. 



Length, 3 mm. 



Locality: Los Angeles, Cal. (collection Coquillett). 



In the original description of the male of this species there are so 

 many details left out that I have considered it better to redescribe it. 



I have not seen the larva or pupa of this species, but Mr. E. H. 

 StricJvland has reared it in Massachusetts. His description of it agrees 

 in both stages very well with that given by Hart for S. johannseni. 



The larva differs from that of other species of Simidium, except 

 johannseni^ in having the outer tooth on each side rounded and with 

 an apical pointed process. The lateral setae number two on each side. 

 The pupa has only four respiratory filaments, and should be readily 

 recognizable from any other North American species except johann- 

 seni by that character alone. 



T have not seen the specimens reared by Strickland and have to 

 accept his published authority for the identification. 



Simulium exiguum Roubaud. 



Female. — Black, subshining. Frons very slightly dusted, ^ace dis- 

 tinctly whitish pollinose, antennae yellow, basal joint and apical 

 joints slightly browned, palpi yellow, brown at aj^ex. Scutum un- 

 dusted, pleurae with distinct pearlaceous pollinosity, postscutum 

 whitish pollinose. Abdomen black, segment below basal scale entirely 

 covered with pearlaceous pollinosity, next segment opaque, the re- 

 mainder glossy on disk, with slight indications of whitish pollinosity 

 on lateral margins. Legs yellow, blackened on mid and hind coxae, 

 fore tarsi from ajoex of first joint to tip, last joint of mid tarsi, mid- 

 dle of femora, apices of tibiae, ventral surfaces of first joint at apex 

 and last joint of tarsi of hind legs. Wings clear, thick veins yellow. 

 Halteres yellow. 



Frons with sides very slightly divergent posteriorly, occupying at 

 upper angle of eyes less than one-third the head width; face much 

 more elongate than usual, nearly "twice as long as broad, as broad 

 as frons at lower angle; both face and frons with extremely weak 

 surface hairs; occiput with pearlaceous pollinosity; postocular cilia 

 weak, dark. Scutum with iridescent, golden yellow, rather broad, 

 scalelike pilosity which is arranged in, irregular groups; pleural tuft 

 weak, brown; scutcllum with similar pilosity to scutum and some 

 long, upright, brown hairs. Abdominal basal fringe short, sparse, 



