103 
longitudinally oblong, subtruncate at tip, battened above, fus¬ 
cous, strongly retracted among the dorsal segments just pre¬ 
ceding, and' but slightly projecting behind, the cauda represented 
only by a small transverse plate at base; preceding two or three 
segments strongly arcuate, brown at middle. 
Beneath, color same as above. Rostrum very robust, yellowish 
fuscous at base, distal segment fuscous, tip blackish, reaching 
posterior margin 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 eoxse, 
yellowish fuscous, with blackish sutures, sparsely hairy, moderately 
long. Thoracic spiracles in dark spots behind and exterior to 
the anterior and middle coxae, abdominal spiracles in a ro^r 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 trans¬ 
versely 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 antennae. 
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. 
Pupa (Plate X., Fig. 1). —This is very similar in general 
color-markings and vestiture to the viviparous female, but is 
more elongate. The antennae are as in the viviparous female, 
and are five-jointed; the eyes are large and well developed, oc¬ 
cupying the entire side of the head back of the antennae, the 
posterior tubercle distinct. The head and thorax are darker 
than the abdomen, metathorax darker than mesothorax, wing- 
pad* also darker towards tips, attaining side of second abdomi¬ 
nal segment. Prothorax slightly longer than in the viviparous 
female; abdomen exactly as in that form. Head and first two 
segments of thorax beneath darker than the remaining body 
segments. 
Length 1.95 mm., breadth 1mm. 
Described from two specimens, taken May 31 of different years. 
Winged Viviparous Female (Plate X., Figs. 2 and 3). The 
single 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 antennae 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, IV 
and V equal, the two combined about equal to III, 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 
