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. Antennse 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 area, situated within an ovate much larger area, is obsolete in Polistes.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 iiot being so 

 clearly dividetl 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 maxillse are 2-tuberculate, swollen externally. The labrum 

 is distinct from the mentum, 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 



