80 Journal New York Entomological Society. [Voi. v. 
expanded, forming an irregularly hexagonal expansion, the end of 
which is broad and square, with the edge excavated. 
Vespa (probably. V. arenaria Fabr.'). 
Larva. —The head is about as long as broad, the vertex very slightly 
depressed in the mesial line. Eyes well marked by a long narrow testa¬ 
ceous line. Antennae rather remote from the sides of the clypeus, 
when compared with those of Polistes; the round flattened antennal 
area, situated within an ovate much larger area, is obsolete in Polistes. 
The clypeus is much longer and narrower than in Polistes , extending 
farther back towards the vertex; the posterior portion not being so 
clearly divided from the anterior part as in Polistes. It is a quarter 
longer than wide, and it differs very much from Polistes by its front 
edge contracting and narrowing towards the labrum, where in Polistes 
it rather spreads, so that the labrum is much narrower, being less swol¬ 
len, nd shows a tendency to become bilobate. Mandibles stout, thick, 
oblong, bidentate, the teeth small, cylindrical, not nearly so sharp as 
usual. The maxillae are 2-tuberculate, swollen externally. The labrum 
is distinct from thementum, with two terminal tubercles, and a terminal 
testaceous line, probably the lingua. 
The body is long, cylindrical, not curved on itself so much as in 
Polistes owing to its posture in the broad cell, which is longer and nar¬ 
rower than that of Polistes. Posteriorly each segment is somewhat thick¬ 
ened, as are the pleural ridges. The end of the abdomen is rather blank, 
the last sternite large and transverse, while the tergite is considerably 
smaller than in Polistes. The elements of the ovipositor are distinct, 
two rather remote tubercles visible on the 8th abdominal segment, and 
4 arranged in a semicircle on the 9th, the two inner ones much larger 
than the minute outer pair. Above, owing to the thinness of the pelli¬ 
cle along the median line of the body, the dorsal vessel can be distinctly 
seen in the alcoholic specimens; each section of the vessel dilating prob¬ 
ably near the posterior edge of each segment where the valves are prob¬ 
ably situated and dilating not angularly so to speak from the insertion 
of the succeeding section. 
Halictus parallelus Say and H. ligatus Say. 
Larva. —Body very slender, cylindrical, quite different from the 
broad flattened body of Andrena; it is rather obtuse behind, but in 
front tapering slowly towards the head, which is of moderate size, and 
of the width of the prothoracic segment. The thoracic segments are a 
little tuberculated on each side; they are much more convex than the 
