THE CHIRONOMID:. 189 
D. obscurimanus, Mg. 
Testaceous, shiny. Head black ; thorax with three black stripes. 
The abdomen is black, the posterior borders of the segments being 
testaceous. ‘The antenne are black and composed of seven joints, 
paler at the base; in the ¢ the plumose antennz have the last joint 
very long. Wings have the costal, first and second longitudinals, 
and the prebrachial transverse veinlet black, the rest white; the 
pobrachial areolet closed before the fork of the pobrachial vein. 
Legs stout and pubescent, reddish-brown, tarsi black, fourth tarsal 
toint about twice as long as the fifth. Length, 3 lin. 
D. Chiron., Hal. 
Male: “ Antenne brownish-yellow ; first joint dusky cinereous ; 
feathers yellowish ; last joint much longer than the rest jointly, 
Thorax with the sides ferruginous before the wings (scutellum also, 
but darker). Wings hyaline, veins very pale; pobrachial areolet 
closed a little beyond the fork of the pobrachial vein. Halteres 
pale yellow. Legs and coxz ferruginous ; only the tips of the tarsi 
dusky ; fourth joint of the tarsi about twice as long as the fifth ; pos- 
terior tibizee and femora hairy ; fore tarsi still more so; first joint a 
little shorter than the tibia. (Abdomen lost in the only specimen. )” 
flaliday MSS. Length, 2 lin. 
D. Walthi, Mg. 
Female: “ Biackish, with a slaty-gray tinge on the vertex, mesono- 
tum and metanotum, and three faint, darker, shifting stripes on 
the mesonotum. Antennz 7-jointed ; last joint long elliptical, as 
long as the three preceding. Wings hyaline, with the anterior veins 
conspicuous, fuscous. ‘The pobrachial areolet closed beyond the 
fork of the pobrachial vein. Incisures of the abdomen with a paler 
shade. Legs finely pubescent ; first joint of the fore tarsi shorter 
than the tibize; fourth shorter than the fifth, notched at the tip.” 
ibid. Length, 2 to 2} lin. 
D. Ammon., Hal. 
** Pale slaty-gray. Fore-legs dusky; femora at the base and 
cox light ferruginous ; posterior femora and posterior tibiz ferru- 
ginous, except at the tips ; tarsi somewhat lighter brown at the base, 
fourth joint the shortest, notched almost obcordate. 4, front 
broad. Eyes a little emarginate internally. Antennz nearly as long 
as thorax, dingy yellow ; feathers light yellowish. Wings white, as is 
also the very faint pubescence on the hind margin; the usual veins 
