D. Keilin 
441 
einiger neuen Arten,” cette ? prend place a cote de Ch. brassicae 
Bouche $. 
3. Description of a new species of Phaonia. 
By J. E. Collin (Newmarket). 
Phaonia ( Hyetodesia) Keilini n. sp. 
In general appearance resembling laeta, but legs black, presutural 
acrosticbals very irregular and placed close together, hind tibiae with 
two posterodorsal 1 bristles or if only on§, that is placed at middle of 
tibia. 
<?. Frons rather wider than in laeta with a few black hairs mixed 
with, and scattered on each side of the rows of frontal bristles. Anten¬ 
nae with a rather shorter plumed arista. Palpi black. Thorax with 
similar markings, viz. two narrow dark lines (rather closer together than 
in laeta) between the rows of dorsocentral bristles, extending to the 
front margin but abbreviated behind; a median dark line beginning 
where the narrow lines cease, widening out towards, and extending 
well on to disc of scutellum; outside the dorsocentral rows there is a 
small elongate black patch in front, and another behind the suture; 
while the supra-alar bristles stand upon another dark streak. The 
short dark hairs are rather more numerous than in laeta ; ■ presutural 
acrostichals very irregular, the rows placed very close together; at 
least three distinct humeral bristles; four pairs of postsutural dorso- 
centrals; three supra-alar bristles, the front one (pre-alar bristle of 
Stein) about half the length of second; two postalar bristles; some 
fine hairs on hypopleura close to the mesothoracic spiracle, as in laeta. 
Abdomen grey with a central stripe and the hind-margins of segments 
black, but these dark markings vary in extent and alter in colour 
according to the point of view. Discal macrochetae on last two seg¬ 
ments not so strong as in laeta. Legs black with only the extreme 
knee-joints yellowish. Anterior femora with a few short anteroventral 
spines towards tip. Front tibiae without bristles except at tip. Middle 
tibiae with two short bristles behind, one just above the other below 
middle. Hind tibiae with 2-4 small anteroventral bristle^ about middle, 
one or two longer anterodorsal bristles (one just above, the other below, 
1 For the purpose of describing the position of bristles, all the legs are considered as 
fully extended, the side towards the head being the anterior and towards the abdomen 
the posterior; posterodorsal being half way between the upper (or dorsal) and the posterior 
sides. 
