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91 
Beneath, color same as above. Rostrum very robust, yellowish fus- 
cous at base, distal segment fuscous, tip blackish, reaching posterior mar- 
gin of mesothorax. Basal portion less than twice as long as thick, last 
joint a little longer, penultimate half as long as last and about twice as 
thick. Legs, including coxw, yellowish fuscous, with blackish sutures, 
sparsely hairy, moderately long. ‘Thoracic spiracles in dark spots behind 
and exterior to the anterior and middle cox, abdominal spiracles in a 
row of similar spots on each segment. Below the spiracles is a row of 
dark spots in the sutures, and dark points often occur midway between 
adjacent spiracles. ‘The seventh segment has a transversely oblong 
brown spot at middle as usual. Genital valves brown, often concealed. 
Length 1.9 mm., greatest width 1.4 mm., antenna .4 mm. 
The young are paler, more elongate, with longer beaks, and clearly 
four-jointed antenne. 
Described from a large series of examples usually taken in ants’ 
nests upon the roots of various grasses and other plants, or wandering 
in the galleries. 
Pupe (Plate X., Fig. 1)—This is very similar in general color- 
markings and vestiture to the viviparous female, but is more elongate. 
The antenne are as in the viviparous female, and are five-jointed; the 
eyes are large and well developed, occupying the entire side of the head 
back of the antennx, the posterior tubercle distinct. The head and tho- 
rax are darker than the abdomen, metathorax darker than mesothorax, 
wing-pads also darker towards tips, attaining side of second abdominal 
segment. Prothorax slightly longer than in the viviparous female; ab- 
domen exactly as in that form. Head and first two segments of thorax 
beneath darker than the remaining body segments. 
Length 1.95 mm., breadth 1 mm. 
Described from two specimens, taken May 31 of different years. 
Winged Viviparous Female (Plate X., Fig. 2 and 3).—The sin- 
gle specimen in our possession is not in good condition, and cannot be 
fully described. The head and thorax are blackish, the abdomen pale, 
with dark spots at the sides of the segments above, and transverse discal 
bands. The antenne are more slender than in the wingless female; 
joints I and II are very short and subequal, III twice as long as I and 
II combined, ITV and V equal, the two combined about equal to ITI, 
spur of V about half as thick as the basal portion, and a little longer 
than thick, subcylindrical. On the lower side of III are eight or nine 
large sensoria arranged in a single row; and two can be seen on V. The 
wings are not large, subcostal vein broad, stigma large, radial vein 
strong, outer two thirds straight, directed a little above the tip of the 
wing, cubital obsolete at base, beginning below middle of stigma.  Dis- 
coidal veins united for a short distance at base. Hind wings with but 
a single vein, the discoidals entirely absent. 
Described from one individual, bred about June 5 from a pupa 
taken May 31 from blue-grass roots in a Lasius nest. 
Among material taken in the fall and winter I find two additional 
forms presenting constant differences, and from what I know of the 
